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The 8 Best k f concept ttl flashes of 2024

Are you trying to find k f concept ttl flashes among various brands on the market but aren’t sure where to begin? To assist you in finding the right one, we’ve put together a list of the 7 best to help you pick the perfect one!

We investigated and evaluated a number of the top-selling k f concept ttl flashes on the market in order to create our list of the best. Making a decision among the many options available is never simple. There are an infinite number of models available, each with a distinct price. And as you’ll find out, the best options aren’t usually the ones you imagine! This comparison is rich and relevant because of the numerous factors that were employed. You will find products featured in this ranking not only based on their pricing but also on their features and other customers reviews. To write this review, we completed 17 hours of research and did 62 k f concept ttl flashes tests. You won’t need to pick products at random any more. If you’re unsure of what to look for, browse our list and consult the buying guide!

An overview of our top picks

Table of contents

The best k f concept ttl flashes you can buy today

No. 1
K&F Concept Speedlite Camera Flash TTL Macro Ring Flash for Nikon KF-150N
  • Guide Number: 14 (ISO 100)
  • Power Supply: 4 x AA size batteries (alkaline manganese batteries / nickel-metal hydride rechargeable batteries can be used)
  • Number of luminosity: 100 - 1500 times
  • Zoom Range: About 2-5 meters
  • Size: Control unit: 5.6 x 2.9 x 2.4 inches (143 x 73 x 61 mm); Luminescent unit: 5.1 x 5.0 x 1.1 inches (130 x 126 x
  • Weight: Approx. 16.2 oz (465 g) (main unit only)
  • French (Publication Language)
No. 2
K&F Concept Camera Flash Speedlite with LCD Display, External Flash Speedlite Compatible with Canon Nikon Sony Olympus Pentax DSLR & Digital Cameras with Single-Contact Hot Shoe
  • The speedlite with high Guide No.GN54 (ISO 100,180mm), super output power, high illumination and farther irradiation distance.
  • Multiple flash modes: Support M, S1, S2 and strobe mode, manual flash, manual zoom.
  • Large LCD screen with backlight mode, easy to master information though in dark.
  • 2.9 seconds high-speed recycle time, won't let you miss every wonderful moment.
  • Using standard hot shoe contacts, universal for most Canon EOS and Nikon DSLR cameras.
No. 3
NEEWER TT560 Camera Flash Speedlite 5500K with Standard Hot Shoe Mount Compatible with Canon Nikon Panasonic Olympus Pentax Fijifilm and Other Digital Cameras
  • 【Rotatable & Versatile】 This flash, with its innovative rotation design, rotates up to 90 degrees vertically and 270 degrees horizontally, making it more flexible to adjust the direction to your exact needs, no matter you're exploring dark corners or working in tight spaces for unmatched convenience and versatility. Please note that it does not support TTL and the camera menu setting Function
  • 【Standard Hot Shoe】 The flash comes with a built in hot shoe mount for easy mounting onto any DSLR camera. Compatible with Canon Nikon Panasonic Olympus Pentax Fijifilm and Compatible with Sony with Mi Hot Shoe cameras, like a9 a7 a7II a7III a7R III a7RII a7SII a6000 a6300 a6500 (NOT compatible with Canon EOS Rebel SL3/250D Rebel T7/1500D 2000D Rebel T100/3000D 4000D)
  • 【Customizable Lighting】 With a guide number of 38 (ISO 100), light quantity output control in 1/8 stop increments and a color temperature of 5500K, you can customize the intensity and warmth of your flash to your preferences. Also, its fast and reliable flash duration of 1/300s to 1/20000s ensures that you'll always have ample lighting when needed
  • 【Multiple Flash Modes】 3 flash modes: M, S1, and S2, with adjustable power levels from 1/128, 1/64, 1/32, 1/16, 1/8, 1/4, 1/2 to 1/1, for your precise control over its intensity. M mode for synchronous flashes with manual flash power control. S1 mode fires synchronously with the master flash, S2 fires with the second flash except for the master flash for unique lighting effects. The user friendly interface with intuitive controls for easy navigation and control
  • 【Power Source】 Powered by 4 x AA sized batteries (not included); At just 0.6lb/286g, this flash is portable, easy to carry around, and never weight you down on long shoots or hikes
No. 4
MEIKE MK-320N Mini TTL Speedlite Automatic Flash for Nikon MI Hot Shoe DSLR and Mirrorless Cameras J1 J2 D550 D810 D800 D3300 D7000 etc
  • Fit nikon camera (DSLR or Mirrorless)
  • Supports manual, ttl,optical slave(s1,s2),stroboscopic mode ,front/rear curtain-sync,overheating protection,automatic sleep mode
  • Built-in LED auxiliary lighting ,external USB interface
  • Size:110*65*35mm,weight only 150g , small and easy to carry
  • Metal hot shoe , support ON-Camera and OFF-Camera Flash Triggering
No. 5
Voking VK750III Remote TTL Speedlite Slave Mode Flash with LCD Display Compatible with DSLR Standard Hot Shoe Cameras EOS Rebel 4000D 5DS 5DSR 5S Mark IV 5D Mark III 6D 6D Mark II 7D 70D 77D 80D
  • External flash for taking professional-looking photos in low-light conditions;fits EOS 5DS,5DSR,5S Mark IV,5D Mark III,6D,6D Mark II,7D,70D,77D,80D,Rebel T5 ,Rebel T5i,Rebel T6,Rebel T6i,Rebel T6s,Rebel SL1,Rebel SL2 and other DSLR cameras
  • 6 flash modes for versatility:TTL M MULTI S1 S2 REMOTE
  • Wireless sensor for triggering flash by slave mode and remote mode;supports front and rear curtains Sync
  • Vertical rotation angle: 0-90 degrees,Horizontal rotation angle: 0-270 degrees;fast recycle time;Accurate brightness control
  • LED-Assistive preview focus;Memory function;Temperature detection function;Flash Exposure Compensation
No. 6
MEIKE MK-320S Mini TTL Speedlite Automatic Flash for Sony MI Hot Shoe DSLR and Mirrorless Cameras A7 A7II NEX6 A6000 A6300 A6500
  • FIt Sony MI Hot Shoe cameras , A3000 A5000 A5100 A6000 A6300 A6500 A7 A7R A7S A7II A7SII A7RII A7MII NEX-5 NEX-6 A77II A58 A99 A99II RX1 RX1R RX1RII RX10 RX10II RX10III RX100II HX400V HX50V
  • Supports manual, ttl, optical slave(s1,s2),stroboscopic mode ,front/rear curtain-sync,overheating protection,automatic sleep mode
  • Build-in highlight LED light can provide the auxiliary lighting for the video clips
  • Flash can rotate 60 - 90 degree horizontally and -7 - 90 degree vertically, weight about 150g , small and easy to carry
  • Support ON-Camera and OFF-Camera Flash Triggering , external Micro USB interface can be use as a port to charge the speedlite(must be rechargeable battery ) and upgrade the firmware
No. 7
Voking VK750II TTL Camera Speedlite Flash Compatible with Canon EOS 60D 70D 77D 80D 4000D Rebel T7i T6i T6s T6 T5i T5 T4i T3i and Other DSLR Cameras
89 Consomer Reviews
Voking VK750II TTL Camera Speedlite Flash Compatible with Canon EOS 60D 70D 77D 80D 4000D Rebel T7i T6i T6s T6 T5i T5 T4i T3i and Other DSLR Cameras
  • External flash for taking professional-looking photos in low-light conditions;fits EOS 5DS,5DSR,5S Mark IV,5D Mark III,6D,6D Mark II,7D,70D,77D,80D,Rebel T5 ,Rebel T5i,Rebel T6,Rebel T6i,Rebel T6s,Rebel SL1,Rebel SL2 and other DSLR cameras
  • Flash modes for versatility: TTL M Multi S1 S2
  • With excellent dust and water resistance function; Supports front and rear curtains Sync
  • Vertical rotation angle: 0-90 degrees,Horizontal rotation angle: 0-270 degrees;fast recycle time;Accurate brightness control
  • Additional features: FEC,AEB,Manual zoom,Auto zoom,PC port.
No. 8
Meike MK430 TTL LCD Flash Speedlite Compatible with Canon DSLR Camera EOS 70D 77D 80D Rebel T7i T6i T6s T6 T5i T5 T4i T3i SL2 and with Standard Hot Shoe Stand
  • High GN:42 support stroboscopic mode
  • Supports I-TTL auto flash mode and S1/S2 optical slave mode.
  • Works with Canon DSLR Camera EOS 70D 77D 80D Rebel T7i T6i T6s T6 T5i T5 T4i T3i SL2 and with Standard Hot Shoe Stand
  • Additional features: FEC, AEB, Auto zoom, Manual zoom
No. 9
Neewer TT560 Speedlite Flash Kit compatible with Canon Nikon Sony Pentax DSLR Camera with Standard Hot Shoe,Includes: (1)TT560 Flash + (1)Flash Diffuser + (1)Remote Control
  • Compatible with Canon Nikon Pentax and Sony with Mi Hot Shoe cameras, such as a9 a7 a7II a7III a7R III a7RII a7SII a6000 a6300 a6500 (NOT compatible with Canon EOS Rebel SL3/250D,Rebel T7/1500D 2000D,Rebel T100/3000D 4000D) Note: Not support TTL and the camera menu setting function
  • Powerful Manual Flash with High Guide No. 38(m) /108(ft)
  • Includes Neewer TT560 Photo Flash, Flash Stand, Softbox Flash Diffuser, Remote Control
  • Features a built-in flip down wide angle flash diffuser and reflection panel
  • The Wireless Remote Control is ideal for subjects that are difficult to approach, self-portraits, or any instances where camera vibration is a concern,Compatible with Canon Nikon Sony Pentax DSLR Cameras with an infrared sensor
No. 10
Meike MK-320F Camera Flash, TTL Flash Speedlite with LCD Display and Overheat Protection System for Fujifilm Mini Hot Shoe DSLR and Mirrorless Cameras X-M1 X-T1 X-Pro1 X-A1 X-A2 X-E1 X-E2 X30 etc
3 Consomer Reviews
Meike MK-320F Camera Flash, TTL Flash Speedlite with LCD Display and Overheat Protection System for Fujifilm Mini Hot Shoe DSLR and Mirrorless Cameras X-M1 X-T1 X-Pro1 X-A1 X-A2 X-E1 X-E2 X30 etc
  • COMPATIBLE WITH Fujifilm Camera X-M1 X-T1 X-Pro1 X-A1 X-A2 X-E1 X-E2 X30 X100T X100S S1 SL1000 etc(Please carefully check whether it is suitable for your camera model before buying)
  • MULTIPLE MODES: In addition to supporting TTL, flash speedlite also support manual optical slave(s1,s2),stroboscopic mode ,front/rear curtain-sync; At the same time, in order to better protect the flash, we use overheating protection, automatic sleep mode, low power prompt function and memory function
  • LIGHT SENSING DISTANCE: Speedlite Camera flash can sense 15m indoors and 10m outdoors; As a mini flash with TTL, MK320 is not suitable for wide-angle shooting. The GN value of 32 is enough for many common occasions such as portrait, still life, street shooting, etc
  • LED AUXILIARY FOCUS LIGHT: Built-in LED light can provide the auxiliary lighting for the video clips; In the power-on state, press the switch button to switch the LED light on and off. When the LED light is on, it is effective for within 2 meters in the dark to assist focusing and taking pictures
  • SPECIAL DESIGN: Support on-camera and off-camera flash triggering; Metal hot shoe contact and fixed knob make it more secure and stable to fix with the camera; External Micro USB interface can be use as a port to charge the speedlite(must be rechargeable battery) and upgrade the firmware
No. 11
Camera Flash Speedlite, SLFC Digital Camera Flashes with LCD Display, Electronic Flash for Canon/Nikon/Panasonic/Olympus/Pentax/Fujifilm, DSLR Camera Flash/Slave Flash with Standard Hot Shoe Mount
  • [Beginner-friendly]: Beginning photographers likely will start with simple equipment, such as a point-and-shoot camera or even just a smartphone. But they'll quickly figure out that shooting night photos with a tiny flash doesn't deliver great results or give you much versatility for advanced photography. Flash has some fast settings for capturing quick action or greater details in photo. Importantly, the reasonable budget, beginner-friendly camera flash compatible with all major camera brands.
  • [Compatibility]: The base of an external camera flash unit will slide onto the square-ish hot-shoe bracket on the top panel of an advanced camera.(Simple cameras will not have a hot-shoe bracket.) With a compatible flash and camera pairing, you'll have access to all of the flash's features. Near universal compatibility means this camera flash can be used with most DSLR and mirrorless cameras. Includes wireless shooting modes for off camera photography and studio shots.
  • [Speedlites Features]: Sync speeds --- Typically, a camera operates at a 1/60- or 1/125-second shutter speed when using a flash. However, some flashes will allow for much faster or slower shutter speeds, always syncing with the camera to deliver the best results. 8-Level shutter speeds can be selected. TTL Mode/M Mode/Multi Mode/S1 Slave Mode/S2 Slave Mode/Exposure compensation. Additional Features: Fixed Zoom/Power-saving Automatic Shutdown/External Charging/Over Temperature Protection.
  • [LCD Display]: SLFC Camera Flashes contains a simple interface and settings menu to get the lighting correct with minimal effort. Flash head angles from 0 to 270 degrees. Offers a good mount of flexibility for different light intensities. camera flash offers all of the most common modes and settings for a basic, affordable accessory. Can be used as a slave flash for use with off-camera shooting. Swivels for off-axis shooting as well.
  • [External Camera Flash]: To have better luck with flash photos, it takes an advanced camera with an external camera flash unit. This allows the photographer to angle the light and adjust its intensity. As another benefit, an external flash is tall, which reduces red-eye because it's farther from the lens than a built-in flash. SLFC camera flash — you'll need to understand the importance of its many features, including sync speeds, TTL mode, and exposure-compensation settings.
No. 12
Meike MK600 High Speed Sync TTL Speedlight Camera Flash Compatible with DSLR Cameras 1300D 70D 6D 5DII 5DIII 7D 60D 550D 600D 650D 800D 4000D,etc
  • Flash mode: TTL, HHS, Rear, Curtain, Sync, M, MULTI, S1, S2
  • Compatible cameras: Type-A EOS cameras (E-TTL II/E-TTL autoflash), Type-B EOS cameras (TTL flash)
  • Guide No: 60(at 105mm focal length, ISO 100 in meters/feet)
  • Flash coverage: 24-105mm (14mm with wide panel);Auto Zoom (Flash coverage set automatically to match the lens focal length and image size);Manual Zoom;Swinging/tilting flash head (bounce flash)
  • Flash Duration: Normal flash: 1.2 ms or shorter;Quick flash: 2.3 ms or shorter
No. 13
MEIKE MK-320C Speedlite Flash TTL Fit Canon Mirrorless DSLR Hot Shoe Camera 1D Mark Series 1DS Series 5D Mark II 5D Mark III 5D 6D 7D 7D Mark II 50D 60D 70D 100D 550D 600D 700D 1000D 1100D etc
  • Fit EOSM M2 M3 M5 M6 1DS 5DII 5DIII 5DIV 5D 6D 7D 7DII 50D 60D 70D 77D 100D 550D 600D 700D 1000D 1100D T3i T2i
  • Supports manual, ttl, optical slave(s1,s2),stroboscopic mode ,front/rear curtain-sync,overheating protection,automatic sleep mode
  • Build-in highlight LED light can provide the auxiliary lighting for the video clips
  • Flash can rotate 60 - 90 degree horizontally and -7 - 90 degree vertically, weight about 150g , small and easy to carry
  • Support ON-Camera and OFF-Camera Flash Triggering , external Micro USB interface can be use as a port to charge the speedlite(must be rechargeable battery) and upgrade the firmware
No. 14
Neewer TT560 Flash Speedlite for Canon Sony Nikon Panasonic Olympus Pentax and Other DSLR Cameras, Digital Camera Speedlight with Standard Hot Shoe
  • Vertical Rotation Angle: 0~90 degrees, Horizontal Rotation Angle: 0~270 degrees; Note: Don't support TTL and the camera menu setting Function
  • Compatible with for Canon Nikon Panasonic Olympus Pentax Fijifilm and Sony with Mi Hot Shoe cameras,like a9 a7 a7II a7III a7R III a7RII a7SII a6000 a6300 a6500 (NOT compatible with Canon EOS Rebel SL3/250D,Rebel T7/1500D 2000D,Rebel T100/3000D 4000D)
  • Power Management: Switch to the ON, the flash will start charging (the charging indicator is dim)
  • For a test flash, press the test button. After use, press the ON/OFF to OFF to power off.
  • Red charging indicator lamp flickers in every 1s; it indicates low battery; The flash unit has 8 steps of power output control which indicated by 8 pieces of LED
No. 15
Meike Camera Flash, MK320 M4/3 TTL Flash Speedlite with LCD Display for Panasonic&Olympus Mini Hot Shoe Mirrorless Cameras GF7 GM5 GH4 GX7 G6 GF6 E-M5 II E-M10 E-M1E-PL E-P5 E-PM2 etc(Not for EM10III)
  • COMPATIBLE WITH SONY MI HOT SHOE CAMERAS: Sony A3000 A5000 A5100 A6000 A6300 A6500 A7 A7R A7S A7SII A7MII NEX-5 NEX-6 A77II A58 A99 A99II RX1 RX1R RX1RII RX10II RX100II HX400V HX50(Please carefully check whether it is suitable for your camera model before buying)
  • MULTIPLE MODES: In addition to supporting TTL, flash speedlite also support manual optical slave(s1,s2),stroboscopic mode ,front/rear curtain-sync; At the same time, in order to better protect the flash, we use overheating protection, automatic sleep mode, low power prompt function and memory function
  • LIGHT SENSING DISTANCE: Speedlite Camera flash can sense 15m indoors and 10m outdoors; As a mini flash with TTL, MK320 is not suitable for wide-angle shooting. The GN value of 32 is enough for many common occasions such as portrait, still life, street shooting, etc
  • LED AUXILIARY FOCUS LIGHT: Built-in LED light can provide the auxiliary lighting for the video clips; In the power-on state, press the switch button to switch the LED light on and off. When the LED light is on, it is effective for within 2 meters in the dark to assist focusing and taking pictures
  • SPECIAL DESIGN: Support on-camera and off-camera flash triggering; Metal hot shoe contact and fixed knob make it more secure and stable to fix with the camera; External Micro USB interface can be use as a port to charge the speedlite(must be rechargeable battery) and upgrade the firmware
No. 16
No. 17
GODOX Lux Junior Retro Camera Flash GN12 6000K Color Temperature Auto & Manual Modes 1/1-1/64 Flash Power 28mm Focal Length Replacement for Canon Nikon Sony Fuji Olympus Hot-Shoe Cameras
  • 【Go With You】Lux Junior is a universal camera flash you'd take out wherever you go. It goes with you not only as it brings the pleasure of photography, but it also goes with you in style. Capture the impromptu moments you will never want to miss, or detect your kindred spirits with Lux Junior.
  • 【Timeless In Design】As a tribute to the timeless aesthetics that transcends time, Lux Junior presents the pure classic design and function to explore the essence of photography along with you.
  • 【Push the Lever and Back to the '80s】Being simple is the core concept of Lux Junior. Grab it, select a mode, and start to create. Compatible to all camera types and embrace diversified aesthetics, it lets your inspiration flow with no obstacle. However time changes and tech upgrades, Lux Junior will bring you the pure happiness and beauty of the '80s.
  • 【Keep It Easy】With the widely compatible Auto mode to help you calculate the proper exposure, you can immerse into the pleasure either with digital cameras or film cameras. Capture the present happiness with your hearts, and leave the rest to the Lux Junior.
  • 【Keep It Fun】With Manual mode, explore more possibilities, create your iconic style, or rediscover the pure pleasure when you take the first picture in life. Welcome to the journey of exploring the retro beauty and spirit, and let's create and expect something new in this wonderful journey.
No. 18
No. 19
Mini TTL Speedlite Flash Automatic Flash Compatible with Sony MI Hot Shoe DSLR and Mirrorless Cameras A6000 A6300 A6500 A7 A7II A7RII A7RIII A7III NEX6 A7SII A7R A7S
  • Dedicated flash Compatible With Sony Multi-Interface with vertical bounce Range of 0° - 90° and horizontal swivel Range of 10° - 60°.
  • Autofocus auxiliary lamp helps the camera to focus in low-light situations
  • Includes diffuser
  • Guide Number, (Formula): 32, (Guide Number = Distance × f-number)
  • Power Source: 2x 1.5V "AA" batteries (alkaline, lithium, NiCad & NiMH) - NOT INCLUDED
No. 20
Flashpoint Replacement Hot Shoe for Streaklight 360 TTL for Canon
  • Compatible with Streaklight 360 TTL for Canon

How to choose a good k f concept ttl flashes

Does the idea of finding a fantastic k f concept ttl flashes make you anxious? When it comes to purchasing this product, specifically when deciding which model to select, has your head been spinning between options? You are not alone if that is the case. We are aware of the pressure involved in the purchasing process!

Your presence here indicates that you are interested in k f concept ttl flashes. Before choosing which product would be the best for your needs after being inundated with information, locate a reliable source with genuine selections. You can get that information from a variety of sources, including buying guides and rating websites, word-of-mouth recommendations from friends and family, online discussion forums where users can share their own experiences, product reviews that can be found all over the internet, and YouTube channels. You can only get the right product through exhaustive analysis. But you realize that’s not always simple. In order to ease your concerns, we have taken the time to develop a list of the top k f concept ttl flashes products available right now. You might be wondering how we came up with the list. How was this buying guide developed?

First, we used our algorithms to gather as much reliable data as we could about these products. To verify all the data gathered, we used both artificial intelligence and a lot of algorithms.
Then, our experts used criteria that are recognized in the business to evaluate them according to their quality to price ratio, allowing us to choose the top k f concept ttl flashes on the market right now!

The selection of the goods is not arbitrary. Before creating a list, we take into account a number of factors. Below are some of the criteria discussed:

Brand Value: What happens if you choose a dubious brand just because it appears to be a good deal? So the likelihood of receiving a product with a short shelf life increases. That is due to the fact that well-known brands have a reputation to uphold, while others do not. Top k f concept ttl flashes brands strive to provide some distinctive traits that set them apart from the competition. So, hopefully one or more of the items on our list will be perfect for you.

Features: Useful features are all you need, not tons of them. We consider the important aspects and select the top k f concept ttl flashes based on those.

Specifications: Numbers always help you measure the quality of a product in a quantitative way. We try to find products with higher specifications, but with the right balance.

Quality: A product’s quality may always be quantified with the aid of numbers. We look for goods with better standards that strike the proper balance. The best quality product that gets highly appreciated and recommended by experienced users.

Customer ratings:  Would it be accurate to suggest that the k f concept ttl flashes were used by hundreds of customers before you? Superior ratings indicate that many customers had better service.

Customer Reviews: Like ratings,  provide you with accurate and reliable information about the product from genuine customers. Customer ratings are very important to all of us because they contain accurate and reliable information about the customer service we received from several hundred customers.

Seller Rank: This is very intriguing! Not only do you need a good k f concept ttl flashes, you also need a product with rising sales that is trendy. It accomplishes two goals. First, the expanding user base proves the quality of the product. Second, given that number, producers must be able to offer greater quality and after-sales support.

Value: You get what you pay for, they say, so consider the value. Cheap isn’t always good and expensive isn’t always bad. However, that does not imply that spending a lot of money on a product that is flashy but underwhelming is a good idea. Before adding them to the list, we make an effort to evaluate how much value you can get for your money from your k f concept ttl flashes.

Durability: Durability and reliability are closely related concepts. You will benefit from a strong and long-lasting k f concept ttl flashes for months and years to come.

Product availability: Products come and go, and new ones replace the old ones. Most likely, a few new features and required changes were made. What use is it to use a supposedly good product if the maker no longer supports it? We make an effort to highlight products that are current and offered by one or more trustworthy sellers, if not more.

Negative Reviews: Yes, we do take that into account as well! The goods with the majority of bad reviews are filtered out and disregarded when we choose the best-rated one on the market.

These are the standards by which we selected our k f concept ttl flashes. Do we end our process there? Hell no. The most crucial fact about us that you should be aware of is that we regularly update our website with current and pertinent information. We have one more layer of filtration since we place the greatest importance on reader satisfaction. Please let us know if any product included here is incorrect, irrelevant, subpar, or simply out of date. We always value your opinions, and we’ll work hard to make any necessary corrections to our list in response to them.

Why should you believe us?

There are now thousands of possibilities for these products on Amazon, but choosing the best one can be difficult and time-consuming. And what k f concept ttl flashes should you purchase in 2022?

This guide is the result of more than 10 years of experience in researching, testing and writing about many topics. Each member of our team is an authority in their area. We read every article we could find online and every consumer review on every retail website for seven hours. Additionally, we discovered a ton of websites that offered helpful resources, including buying tips and thorough information on k f concept ttl flashes.