Drop an X3F file from your Sigma SD1 and get the exact shutter actuation count in seconds — processed entirely in your browser, never uploaded anywhere.
Check Shutter Count →The Sigma SD1 (announced January 2011, shipping May 2011) is a professional-class APS-C DSLR featuring Sigma's unique Foveon X3 Direct Image Sensor — a stacked CMOS sensor that captures full RGB colour data at every pixel location, unlike Bayer-pattern sensors. The SD1 uses a 46 MP Foveon sensor (15.3 MP × 3 layers = ~46 MP equivalent). It was originally priced at approximately $9,999, making it the most expensive APS-C DSLR ever released. In 2012 Sigma renamed it the SD1 Merrill and cut the price to $2,299 — the hardware is identical. Sigma does not publish an official shutter rating; the estimated lifespan is approximately 150,000 actuations.
| Model | Release | Sensor | Est. Shutter Life | RAW Format |
|---|---|---|---|---|
| Sigma SD1 | 2011 | 46 MP Foveon X3 APS-C | ~150,000 | X3F |
| Sigma SD1 Merrill (same HW) | 2012 | 46 MP Foveon X3 APS-C | ~150,000 | X3F |
| Sigma SD Quattro | 2016 | 29 MP Foveon X3 Quattro APS-C | ~150,000 | X3F |
| Sigma SD Quattro H | 2016 | 51 MP Foveon X3 Quattro APS-H | ~150,000 | X3F |
"Sigma SD1", while SD1 Merrill files report "Sigma SD1 Merrill". The hardware and Foveon sensor are identical — only the branding and price changed.
The Sigma SD1 saves RAW files in X3F format, which embeds EXIF metadata including the shutter count. ShutterCount reads this directly in your browser:
| Actuation Count | % of Est. Life | Assessment |
|---|---|---|
| 0 – 10,000 | 0 – 7 % | Very low use — near new condition |
| 10,000 – 40,000 | 7 – 27 % | Low use — substantial life remaining |
| 40,000 – 80,000 | 27 – 53 % | Moderate use — normal for active shooting |
| 80,000 – 120,000 | 53 – 80 % | High use — negotiate price; inspect shutter |
| 120,000 + | 80 %+ | Near estimated limit — budget for shutter replacement |
The SD1 is a niche collector and enthusiast body today. SA-mount lens availability is limited to Sigma's own lineup. Given the extreme original price drop (from $9,999 to $2,299) and the rarity of new parts, also verify sensor condition and mirror box integrity alongside the shutter count.
The Sigma SD1 writes RAW images in X3F (X3 Foveon) format. X3F files embed EXIF metadata using Sigma's proprietary IFD structures, which include the cumulative shutter actuation count. ShutterCount processes the X3F file entirely in your browser using JavaScript — the file never leaves your device.
Unlike Bayer-pattern sensors that use a colour filter array (with each pixel capturing only red, green, or blue light), Foveon's X3 sensor stacks three photodiode layers on top of each other — capturing red, green, and blue light at the same pixel location. This produces images with distinctive colour rendering and avoids the demosaicing (colour interpolation) step that Bayer sensors require. The result is often described as film-like for its tonal transitions, though the sensor trades off in high-ISO noise performance compared to Bayer CMOS.
No hardware difference whatsoever. If you are buying an SD1 Merrill (the renamed version sold from 2012), the shutter count reading method is identical — drop an X3F file into shuttercount.app. The only distinction is the EXIF model tag in the file metadata.
Drop an X3F file from your SD1 into shuttercount.app. The shutter count is read from the file's EXIF data in your browser — no upload required.
Sigma does not publish an official rating. The estimated lifespan is approximately 150,000 actuations based on the camera's professional-class positioning.
Yes, the hardware is identical. Sigma originally launched the camera as the SD1 in May 2011 at approximately $9,999, then renamed it the SD1 Merrill in 2012 and cut the price to $2,299 to compete more effectively. Files from each report different model names in EXIF ("Sigma SD1" vs "Sigma SD1 Merrill") but are mechanically and electronically the same.
The SD1 launched at ~$9,999 in 2011 primarily because of the cost of manufacturing the 46 MP Foveon X3 sensor — Foveon sensors require a significantly different and more complex fabrication process than standard Bayer CMOS. The extreme price made commercial viability challenging, which led Sigma to dramatically cut the price and rebrand it as the SD1 Merrill the following year.
Yes, completely free. ShutterCount.app processes your X3F file locally in the browser. No account, no upload, no limit on files.