jjjsood/focus-stack-sample

Focus Stack Sample

A real-world macro focus stack of 999 frames, shot on a Canon EOS R5 Mark II with the RF 100mm F2.8 L Macro. It is meant as test data for focus-stacking software: alignment, fusion, depth-map estimation and performance on long stacks.

All 999 frames stacked. Individual frames are shallow slices of this depth range, as the samples below show.

Frame 0	Frame 499	Frame 998

Dataset structure

tiff/frame_000.tif … frame_998.tif   8-bit sRGB TIFF, deflate, 5118×3412
raw/frame_000.CR3  … frame_998.CR3   Canon CR3 originals, 5088×3392 (1.6× crop mode)
preview/                             JPEG previews (not part of the stack)
SHA256SUMS                           checksums for tiff/ and raw/

Frames are numbered in shooting order, so the first N frames are always a contiguous slice of the focus range. Four subset sizes are served by a single glob each:

Frames	TIFF pattern	TIFF size	CR3 size
10	tiff/frame_00?.tif	251 MB	85 MB
100	tiff/frame_0??.tif	2.5 GB	845 MB
500	tiff/frame_[0-4]??.tif	13 GB	4.2 GB
999	tiff/*	25 GB	8.4 GB

For CR3, swap tiff/…tif for raw/…CR3.

Download

CLI

pip install -U huggingface_hub

hf download jjjsood/focus-stack-sample --repo-type dataset --local-dir focus-stack --include "tiff/frame_00?.tif"      # 10
hf download jjjsood/focus-stack-sample --repo-type dataset --local-dir focus-stack --include "tiff/frame_0??.tif"      # 100
hf download jjjsood/focus-stack-sample --repo-type dataset --local-dir focus-stack --include "tiff/frame_[0-4]??.tif"  # 500
hf download jjjsood/focus-stack-sample --repo-type dataset --local-dir focus-stack --include "tiff/*"                  # 999

Python

from huggingface_hub import snapshot_download

path = snapshot_download(
    "jjjsood/focus-stack-sample",
    repo_type="dataset",
    allow_patterns="tiff/frame_0??.tif",  # first 100 frames
)

Verify

hf download jjjsood/focus-stack-sample SHA256SUMS --repo-type dataset --local-dir focus-stack
cd focus-stack && sha256sum -c SHA256SUMS --ignore-missing

Capture

Camera	Canon EOS R5 Mark II
Lens	Canon RF 100mm F2.8 L Macro IS USM
Sensor mode	1.6× crop (APS-C area), 17 MP, to save space; ~160 mm full-frame equivalent field of view
Focal length	100 mm
Aperture	f/2.8
Exposure	0.3 s
ISO	400
Frames	999, in about 6 minutes
Date	2026-09-29

Processing

The CR3 files are unmodified camera originals. The TIFFs were developed from them with darktable 5.6 using its default settings, identical for every frame, and exported as 8-bit sRGB. No alignment, cropping or retouching was applied. The script that produced them is in the GitHub repository.

Use the CR3 files if you need full bit depth or your own raw development.

Uses

• Testing and benchmarking focus-stacking tools on a long, real stack.
• Evaluating frame alignment (focus breathing, small shifts between frames).
• Depth-from-focus and depth-map experiments.
• Stress-testing memory use and throughput: 999 × 17 MP frames.

License and citation

CC BY 4.0. Please credit Johannes Sood.

@misc{sood2026focusstacksample,
  author       = {Johannes Sood},
  title        = {Focus Stack Sample: a 999-frame macro focus stack},
  year         = {2026},
  howpublished = {\url{https://huggingface.co/datasets/jjjsood/focus-stack-sample}}
}