Comparison

f8 Lens Toolkit vs Kessler kOS

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

f8 Lens Toolkit

This app provides photographers and cinematographers with essential tools for optical calculations. It offers features like depth of field calculation, field of view determination, and lens matching for various camera formats. It's designed to be an indispensable reference tool for professionals and students alike.

Highlights
  • Depth of Field & Hyperfocal Distance Calculator
  • Field of View Calculator
  • Lens Matcher: Equivalent Focal Length & F-Stop
  • Camera Sensor Comparison Tool
  • Lens Coverage Tool
  • Extensive camera and lens database
  • Supports anamorphic shooting and Speedboosters
Features
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f8 is the fastest and easiest tool for all photographic calculations: Effortlessly find corresponding focal lengths & apertures for different formats, calculate depth of field (DOF), and find field of view for any camera and lens. The sensor comparison and lens coverage tool make this app complete. ◈◈◈ Get professional-grade features & the most intuitive user-interface in its class ◈◈◈ No matter if you are a seasoned pro or a film/photography student, f8 has got you covered. It’s packed with the tools you need and highly customizable to deliver precise calculations for any setup imaginable. It has been proven to be an indispensable tool on any shoot. f8 comes with: • Depth of Field & Hyperfocal Distance Calculator • Field of View Calculator • Lens Matcher: Equivalent Focal Length & F-Stop • Camera Sensor Comparison Tool • Lens Coverage Tool • Thousands of cameras & lenses included • Close Focus & Aperture data for most lenses • Supports anamorphic shooting & Metabones Speedboosters f8 is the perfect companion app and reference tool for Photographers, Cinematographers, Camera Operators, Camera Assistants (1.AC) & VFX Supervisors. ◈◈◈ Download f8 now and have a precise optical toolkit at your fingertips ◈◈◈ ◆ CINE CAMERAS ◆ AJA Cion ARRI Alexa 35, Alexa 65, Alexa Classic, Alexa LF, Alexa Mini, Alexa Mini LF, Alexa SXT, Alexa XT, Amira, D-21 Blackmagic Cinema Camera, Micro Cinema Camera, Micro Studio Camera 4K, Pocket Cinema Camera, Pocket Cinema Camera 4K, Pocket Cinema Camera 6K, Pocket Cinema Camera 6K Pro, Production Camera 4K, Studio Camera 4K, Studio Camera HD, URSA, URSA (Broadcast), URSA 4.6K, URSA Mini 4.6K, URSA Mini 4K, URSA Mini Pro, URSA Mini Pro 12K, URSA Mini Pro 4.6K G2 Canon C100, C100 Mark II, C200, C300, C300 Mark II, C300 Mark III, C500, C500 Mark II, C70, C700 DJI Zenmuse X7 Film 16mm, 35mm, 65mm/70mm, 8mm Freefly Systems Wave Generic Broadcast Ikonoskop A-cam dII Kinefinity KineMAX, KineMini, Mavo, Mavo Edge, Mavo LF, TERRA Panasonic AF101, BGH1, EVA1, HDX 900, VariCam 35, VariCam LT Panavision DXL, DXL2, Genesis Phantom 65, Flex, Flex4K, HD GOLD, Miro LC321S, v2640 ONYX, VEO4K-PL PS-CAM X35 RED Dragon-X, Epic Dragon, Epic-W (Helium), Epic-X, Gemini, Komodo, Monstro-VV, One, Ranger (Gemini), Ranger (Helium), Ranger (Monstro), Raven, Scarlet-W (Dragon), Scarlet-X, Weapon (Dragon-VV), Weapon (Helium) Silicon Imaging SI-2K Sony F23, F3, F35, F5, F55, F65, F900, FS100, FS5, FS5 Mark II, FS7, FS7 Mark II, FS700, FX3, FX6, FX9, HDC-1500R, Venice Weisscam HS-2 Z CAM E2, E2-F6, E2-F8, E2-M4, E2-S6, E2G ◆ PHOTO CAMERAS ◆ Canon 1000D/XS, 100D, 10D, 1100D/T3, 1200D/T5, 1300D/T6, 1D, 1D C, 1D Mark II, 1D Mark III, 1D Mark IV, 1D X, 1D X Mark II, 1D X Mark III, 1Ds, 1Ds Mark II, 1Ds Mark III, 200D/SL2, 20D, 30D, 350D/XT, 400D/XTi, 40D, 450D/XSi, 500D/T1i, 50D, 550D/T2i, 5D, 5D Mark II, 5D Mark III, 5D Mark IV, 5DS, 600D/T3i, 60D, 650D/T4i, 6D, 6D Mark II, 700D/T5i, 70D, 750D/T6i, 760D/T6s, 77D, 7D, 7D Mark II, 800D/T7i, 80D, 850D/T8i, 90D, M50, R, R5, R6, Ra, RP Film (Still) 35mm (135), APS, Large Format, Medium Format, XPan Fujifilm GFX 100, GFX 100S, GFX 50R, GFX 50S, X-A7, X-H1, X-Pro2, X-Pro3, X-S10, X-T2, X-T200, X-T3, X-T4, X100V Hasselblad Digital Medium Format Leica CL, M10/M10-R, M8/M8.2, M9/M9-P, S, S2, SL, SL2, SL2-S Mamiya Leaf Credo Series Nikon D1, D100, D1H, D1x, D200, D2H, D2Hs, D2x, D3, D300, D3000, D300s, D3100, D3200, D3300, D3400, D3s, D3x, D4, D40, D40X, D4s, D50, D500, D5000, D5100, D5300, D5500, D5600, D60, D600, D610, D70, D700, D7000, D70s, D7100, D7200, D750, D7500, D80, D800, D810, D850, D90, DF, Z50, Z6, Z7 Olympus E Series Panasonic GH1, GH2, GH3, GH4, GH5, GH5S, S1, S1H, S1R, S5 Pentax 645D, 645Z, K Series Phase One Achromatic+, IQ Series, P 30+, P 40+, P 45+, P 65+ Sigma fp, fp L, SD1, SD15 Sony A290, A390, A450, A580, A6000, A6300, A6500, A6600, A7 III, A7C, A7r II, A7r III, A7r IV, A7s, A7s II, A7s III, A850, A9, A9 II, A900, A99, SLT-A37K, SLT-A57, SLT-A65, SLT-A77

About

Kessler kOS

This advanced software provides precise wireless control for professional camera motion systems. It enables users to create complex, repeatable camera movements for various video and photography applications through an intuitive interface.

Highlights
  • Ultra-refined keyframe control
  • Wireless iPad control
  • Timelapse and stop motion modes
  • Complex keyframe movement
  • Editable keyframes
  • Repeatable camera moves
  • Event mode for live scenarios
Features
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kOS is an advanced camera motion control software that unlocks the highest level of control and features for Kessler’s industry-leading motion control systems including Second Shooter Plus, Second Shooter Pro, and the newest motion control system CineShooter. This app allows for ultra-refined keyframe based control in a powerful and easy-to-use interface for applications such as timelapse, stop motion, live video/cinematography, event video, and advanced photography controlled wirelessly via iPad. CONTROL ANY MOTION Live, looping, stop motion, timelapse, GigaPixel* and Event Mode camera moves at your fingertips. DIGITAL KEYRAMING Simply move each axis into position and hit record. kOS saves your exact positioning for 100% repeatable moves. WIFI CONNECTIVITY Your CineShooter, Second Shooter Pro, or Second Shooter Plus device creates its own WiFi network that you can connect your device to instantly. COMPLEX KEYFRAME MOVEMENT Create up to 20 keyframes at once for ultra complex movement. EASY KEYFRAME SMOOTHING Add and manipulate curves to your moves for ease-in and ease-out motion. Also, link each side of the keyframe to match. EDITABLE KEYFRAMES No need to re-record the move if it's not exactly what you want. Edit one or all axes and keyframes into the perfect position. Featuring incremental, exact motor position plus tap and move keyframe adjustments. REPEATABILITY Repeat the exact same move over and over again at the same speed or variable speeds depending on the application. DELAY BY DATE/TIME Not going to be around when your move needs to start? No problem. Easily set a date/time or fixed amount of time to have your move begin. kOS takes care of the rest. FLASH MARK/BLOOP Sync up your moves easily via the built-in flash marks with adjustable delay. PRE & POST-PHOTOS (TIMELAPSE MODE) Easily add a series of head or tail photos to your timelapse move. GO TO POSITION Set minimum and maximum ranges on each axis (ie. slider 0" to 32") and go to any position by entering a value. LOAD & GO This feature allows for pre-loading a move so that you are able to start instantly whenever you are ready. CAMERA PRE and POST ROLL Trigger your camera to start recording any amount of time before the move begins and when to stop after the move ends. ANALOG CONTROL PANEL Manually control several axes live with the built in analog controller. EVENT MODE Event mode is mainly intended for live events or scenarios where exact position recalling on-the-fly is needed. For example, if you are filming a live concert, you can have different positions on stage saved. You can move easily from the drummer, to the guitarist, to the lead singer and so forth. This mode is also great for repeatedly hitting actor marks on set. GIGAPIXEL GigaPixel is traditionally used for 360 degree virtual tours, panoramic photographs or GigaPixel images which are extremely high resolution photographs that are compiled of many lower resolution photographs. GRAPH EXPANSION Expand the graph with one touch when precise key framing is needed. SCRUB THROUGH MOVE Need to edit a key frame or see when the camera will be in a certain position? Use the scrub feature to instantly move to a desired position. LOOPING Looping is made easy with kOS. Simply select one-time or continuous looping. CAMERA CONTROL Set CineShooter, Second Shooter Pro, Second Shooter Plus device to trigger or control your camera’s exposure time within kOS. AUTO TIMELAPSE CALCULATION Enter your desired clip length and frame rate, then kOS will calculate the run time needed. BUMP BUTTONS Move in very small increments to ensure a precise camera position. DROPBOX INTEGRATION Upload saved moves directly to your Dropbox account within kOS app. MOTOR CONFIGURATION Each axis is able to be customized with individual features such as run speed, dampening, smoothness of curves, bump button, and axis naming.

Screenshots

f8 Lens Toolkit4 screens

Verdict

The call

The clearest difference is review sentiment: f8 Lens Toolkit at 80% against Kessler kOS's 0%. f8 Lens Toolkit also leads on rating (4.9 vs 3.0) and ratings volume (26 vs 3). Kessler kOS's advantage is price (Free vs $9.99). On update cadence, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Kessler kOS is free to download; f8 Lens Toolkit costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

f8 Lens Toolkit holds the better App Store score, 4.9 against 3.0. That said, the two scores are not equally well evidenced: f8 Lens Toolkit has 26 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 80% of f8 Lens Toolkit's written reviews are positive against 0% of Kessler kOS's.

UpkeepUpdate frequency

f8 Lens Toolkit ships an update every 2 months, Kessler kOS every 3 months. The most recent releases landed on September 22, 2026 and July 18, 2026 respectively.

Scorecard6 real differences · 4 level
f8 Lens Toolkit versus Kessler kOS: the parameters behind the verdict, then further details
Parameterf8 Lens ToolkitKessler kOS
Price$9.99Free — better
Rating4.9 (26 ratings) — better3.0 (3 ratings)
Positive reviews79.5% of reviews — better0.0% of reviews
Number of ratings26 — better3
Update frequencyEvery 2 months — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad — betteriPad
Requires iOS16.0 — better18.0
Further details — not scored
Size4 MB38 MB
Age rating4+4+
DeveloperCadrage GmbHKessler Crane Inc.

Customer experience

f8 Lens Toolkit

All ratings26 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews44 reviews
Positive79.5%
Neutral2.3%
Negative18.2%

Kessler kOS

All ratings3 ratings
Positive33.3%
Neutral0.0%
Negative66.7%
Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

f8 Lens Toolkit

No in-app purchases

None

Kessler kOS

No in-app purchases

Questions

Is f8 Lens Toolkit free?
f8 Lens Toolkit costs $9.99, with no in-app purchases.
Is Kessler kOS free?
Kessler kOS is free to download, with no in-app purchases.
Which has better reviews, f8 Lens Toolkit or Kessler kOS?
f8 Lens Toolkit is rated higher. f8 Lens Toolkit averages 4.9 out of 5 from 26 ratings, while Kessler kOS averages 3.0 from 3 ratings.
Do f8 Lens Toolkit or Kessler kOS have ads?
Neither f8 Lens Toolkit nor Kessler kOS shows ads.
Which is updated more often, f8 Lens Toolkit or Kessler kOS?
f8 Lens Toolkit ships an update every 2 months, and Kessler kOS every 3 months. Most recently, f8 Lens Toolkit was updated on September 22, 2026 and Kessler kOS on July 18, 2026.

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