blendMean
Smooth
Silky water, blurred clouds, waterfall photography
Slow down time.
With just your iPhone.
Lento is a long exposure camera app. Silky water, light trails, ghost removal, all in real time. No tripod. No ND filter.
Three ways
to bend time.
Every mode is a different Metal blend shader running live on the GPU. Pick one, watch the exposure build in real time.
Manual control.
Like a real camera.
ISO 100-3200
Focus Manual + AF
Duration 1s to ∞
Timer 3s / 10s
Live preview
Watch the long exposure build up on screen while you shoot. What you see is exactly what you export.
Metal GPU stacking
Every frame is blended in real time by Metal compute shaders. Full 30fps capture with zero dropped frames.
Bulb mode
Open the shutter and close it whenever you want. Minutes or hours, the exposure keeps building.
Handheld friendly
Each frame is exposed normally, so camera shake never ruins the shot. Tripods are optional, not required.
RAW. Real RAW.
Lento exports 16-bit DNG, even from exposures that run for minutes. Push shadows, recover highlights, grade it like a file from a real camera.
Technology
How frame stacking works
01
Capture
Lento captures frames continuously at 30fps using your iPhone camera, just like shooting video.
02
Stack
Each frame is blended in real-time on the GPU using Metal compute shaders. Choose from mean, lighten, or median blending.
03
Export
Get your long exposure photo in RAW DNG, HEIF, or JPEG. Full 12MP resolution with P3 wide color.
Unlike traditional long exposure photography that requires ND filters and a tripod, Lento uses computational photography to stack frames digitally. Shoot silky waterfalls, capture light trails at night, or remove crowds from landmarks. All handheld, with just your iPhone.
Private by design.
Your photos never leave your iPhone.
Every frame is captured, stacked, and exported on-device. No cloud processing, no photo uploads, no analytics on your images. The camera roll is the only place your shots ever live.
Pricing
Try free. Go Pro when ready.
Free
$0- Smooth + Light Trail modes
- HEIF output
- 5 second limit
- 1 export included
- Watermark on exports
Pro
$9.99/year7-day free trial
- All capture modes
- RAW DNG / JPEG / HEIF
- Full manual controls
- Unlimited duration + Bulb
- Unlimited exports
- No watermark
or $29.99 lifetime
Cancel anytime. Or pay once, keep forever.
Get Lento today.
Available now on the App Store
iPhone XR or later / iOS 18 required
Questions
FAQ
Do I need a tripod for long exposure on iPhone?
No. Lento uses computational frame stacking, not a physical slow shutter. Each individual frame is captured at a normal shutter speed, so camera shake doesn't affect the result. You can shoot handheld, though a tripod gives sharper results for very long exposures.
How is Lento different from the iPhone's built-in Long Exposure effect?
The iPhone's Live Photo long exposure effect only works with 3 seconds of footage captured after the fact. Lento captures in real-time with a live preview, supports unlimited duration, gives you full manual control over ISO and focus, and exports in RAW DNG format.
Can I shoot RAW long exposure photos on iPhone?
Yes. Lento Pro exports 16-bit DNG files at full 12MP resolution in the P3 wide color space with complete EXIF data. It is one of the very few long exposure apps on iPhone with RAW export, and the only one that combines it with unlimited exposure time.
What's the maximum exposure time?
Free users can capture up to 5 seconds. Pro unlocks unlimited duration, so you can shoot for minutes or even hours. There's also a Bulb mode where you control the shutter manually.
What iPhone models are supported?
Lento requires iPhone XR or later (A12 chip with Metal 2 GPU). It runs on iOS 18 and later.
How much does Lento Pro cost?
Lento Pro is $9.99 per year with a 7-day free trial, or $29.99 as a one-time lifetime purchase. Both options unlock all capture modes, RAW DNG export, full manual controls, unlimited duration, and remove the watermark.
Guides
All posts From the blog
How to Photograph Fireworks on iPhone
Capture full firework bursts as light trails instead of frozen dots.
ReadDo You Need an ND Filter for iPhone?
Why frame stacking replaces ND filters for daytime long exposure.
ReadHow to Remove People from Photos on iPhone
Remove tourists and crowds using long exposure frame stacking. No editing needed.
Read