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AR Composition Viewfinder

VIEWFINDER · OPTAXIS
All features free · no limits
A pro-grade framing and planning tool for medium & large format, Leica, Hasselblad, Fujifilm GFX and Phase One IQ users. Lens library, format library, astro planning and smart recommendations are all free.
Free tier
11 lens brands + 20+ formats
11
lens brands
200+
lens models
20+
数字后背

Lens brands (all built-in, free switching)

ALPA HR Schneider SK Schneider LF Rodenstock LF Zeiss Supreme Prime Hasselblad XCD Fujifilm GFX Leica M Leica SL Leica S Angenieux Optimo + custom lenses

Digital backs / full frame / large format (free switching)

Phase One IQ4 150MP Leica M11 / M11 Mono Hasselblad X2D 100C Fujifilm GFX 100 II Phase One IQ3 100MP 35mm FF 4×5 large format 8×10 large format 120 medium format + custom formats
Core features
10 free core features
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Live hyperfocal + equivalent focal length FREE
Switch lens / format → auto-calculate hyperfocal (f/8 reference); focus there for sharp from H/2 to infinity. Non–full-frame formats display 35mm equivalent focal length — essential for film shooters.
H∞ 2.5m ≈14mm FF
Sun / Moon / Milky Way AR azimuth FREE
AR lines for sunrise / sunset / current sun position overlaid on the live frame. Side panel shows sunrise time, moon phase, moon altitude, Milky Way visibility score, and tonight’s best Milky Way window.
Sunrise 06:48 Moon 87% MW ★★★★
Golden / blue hour countdown FREE
Live countdown to the next golden / blue hour, automatically distinguishing morning gold, evening gold, morning blue, and evening blue.
✦ Eve gold 2h38m ❈ Eve blue 3h15m
Milky Way rotation prediction + Polaris star-trail planning FREE
Galactic-core azimuth + altitude at +30m / +1h / +2h ahead — essential for timelapse and tracked exposure. Polaris view shows current latitude, relative azimuth, 500-rule max single exposure, and frames needed for a 30-minute stack.
+30m ↗+15° ↑+2° N 42° ×72 ≈ 30m
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RGB histogram + HDR scene detection FREE
Top-bar live RGB + luminance histogram with automatic high-contrast scene detection. Over 5% clipping at either end suggests “consider HDR”; over 15% suggests “bracket exposure”.
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Light meter · DOF · ND · reciprocity FREE
Live EV / Lux metering with adjustable ISO / aperture / exposure compensation, ND-filter shutter correction, long-exposure reciprocity correction, DOF range and hyperfocal. Tap anywhere on the frame to move the metering point.
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Two-axis level + tilt-angle threshold warning FREE
Live two-axis bubble level. Tilt is colored across four ranges — green level → white slight → gold moderate → orange large warning — essential for architecture and landscapes to avoid keystoning.
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Vision analysis (on-device AI, offline) FREE
Apple Vision framework scans the frame at 1 Hz: portraits, faces, architecture, and horizon are auto-detected. Reflection detection draws red rings around glass / water and suggests a polarizer. Color-harmony scoring (k-means + HSL wheel) gives a 0–10 palette rating.
👁 100% on-device Never uploads
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Composition smart recommendations (8 rules) FREE
Combines lens / format / level / astro data to surface up to 3 contextual suggestions: ⚠ excessive tilt · ✨ Polaris in frame · ☀ wait for golden hour · 🌕 full-moon night-scene settings · 💡 telephoto safe-shutter.
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Shooting log + GPS + camera-direction azimuth FREE
Capturing with the meter open auto-writes a log entry containing parameters, place name, coordinates and camera magnetic azimuth (e.g. SSW 215°). Log list, detail and map pins all show direction.
Film toolkit
Film-shooter exclusive tools (all free)
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Live B&W filter preview FREE
Pixel-level B&W filter simulating traditional film color filters: Red 25 (deepens blue sky) · Orange 16 · Yellow 8 · Green 58 · Blue 47.
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Composition guide grids (6 styles) FREE
Rule of thirds · golden ratio · golden spiral (4 orientations) · diagonal · center cross · none. Long-press to set color and opacity.
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Magnetic-azimuth calibration (±2° per tap) FREE
When AR azimuth lines are on, ± calibration buttons appear in the bottom bar to fine-tune magnetic interference or local declination.
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Equipment archive + kit combinations FREE
Bodies, backs, lenses, filters and film all stored with cloud sync. Combine items into kits (e.g. “weekend hike”, “studio”) and load the gear checklist with one tap.
Free vs Pro
Free vs Pro comparison
✦ AR Viewfinder is fully free
All 13 viewfinder aids are free
所有取景、计算、规划、本地视觉分析功能全部免费,无功能限制。 工具箱里仅俯仰计算器(Scheimpflug 倾斜角与景深)为 Pro 付费项, The remaining 11 pro tools (focal-length conversion, exposure + ND, DOF, weather, astro, timelapse, perspective, FoV, print size, shooting log, AR viewfinder) are all free.
功能
免费
Pro
11 大品牌镜头库
20+ 数字后背画幅
超焦距 / 等效焦距
Sun / Moon / Milky Way AR
金时 / 蓝调倒计时
Milky Way rotation prediction
星轨规划 + 500 法则
RGB 直方图 + HDR 识别
Light meter / ND / reciprocity
水平仪 + 俯仰警告
Vision 本地视觉分析
构图智能推荐
拍摄日志 + GPS + 朝向
B&W 滤镜实时预览
器材档案 + 套装
俯仰计算器(Scheimpflug)
Pro
OPTAXIS
Where the optical axis
meets community
All 13 aids in the AR Viewfinder are free; 11 of 12 toolbox tools are also free.
现在打开「光轴」App 进入构图器开始体验。
Get started