What camera produces ERF files?

The Epson R-D1 and R-D1x, the first digital rangefinders, made in collaboration with Cosina. Epson left the camera market afterwards.

Can modern software open ERF?

Yes — Lightroom, darktable and RawTherapee all read it, and the format is well documented despite the camera's rarity.

My raw file is over the size limit — what can I do?

Convert to DNG with Adobe's free DNG Converter, which typically cuts 15–20% while keeping the file fully editable. That's usually enough to bring it under 25 MB.

Host an ERF file and share it as a link

Put an Epson raw photo online at its own address — from the rangefinder Epson briefly made.

You can host:

Drop your ERF file here

Any other file works too — up to 25.0 MB, or 100.0 MB for a whole site

Free to use. Your ERF file is live at your-name.99helpers.site in about ten seconds.

What is a .erf file?

ERF is Epson's raw format, used by the R-D1 — the first digital rangefinder camera, released in 2004 and still sought after by Leica-mount enthusiasts. Epson left the camera business shortly after, so ERF files come from a small and specific set of cameras.

What people use ERF files for

Photos from the Epson R-D1 and R-D1x
Rangefinder photography archives
Collector and enthusiast libraries

What opens a ERF file

Lightroom and Camera Raw
darktable and RawTherapee
No browser displays ERF

How to host a ERF file

1
Drop your ERF file in
Drag it onto the box at the top of this page, or click to choose it. Files up to 25 MB are supported, and nothing is uploaded until you publish.
2
Pick an address
Type a name and we'll tell you straight away whether it's free. That becomes the link: rangefinder-raw.99helpers.site
3
Publish and share
Create a free account — that step exists so the file is yours to update, replace or delete — and the link is live within seconds.

The same three steps work for any file — see how file hosting works on 99helpers.com.

What happens when someone opens the link

The file downloads and opens in a raw editor. Most converters still support it despite the camera's rarity.

Why host a ERF file instead of emailing it?

R-D1 files circulate among a small enthusiast community where sharing originals is common. A link is simpler than a forum attachment limit.

Worth knowing before you publish

Host a JPEG alongside so people can see the shot without a raw editor.
Converting to DNG with Adobe's free converter makes ERF openable in more software, and usually smaller.
Raw files carry GPS coordinates and camera serial numbers in their metadata.

ERF hosting questions

What camera produces ERF files?: The Epson R-D1 and R-D1x, the first digital rangefinders, made in collaboration with Cosina. Epson left the camera market afterwards.
Can modern software open ERF?: Yes — Lightroom, darktable and RawTherapee all read it, and the format is well documented despite the camera's rarity.
My raw file is over the size limit — what can I do?: Convert to DNG with Adobe's free DNG Converter, which typically cuts 15–20% while keeping the file fully editable. That's usually enough to bring it under 25 MB.

Put your ERF file online now

It takes about ten seconds, and you only make an account once the file is ready to go live.

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Hosting guides for related formats

Host a camera raw file Host a DNG raw photo Host a Canon CR2 raw file Host a Nikon NEF raw file Host a JPG photo

ERF is one of over 211 formats you can host — see free file hosting for any file type for the full list, or read the hosting guides for other file types.