Computar 270mm F9

[tmcsweeney]

I was able to rescue this lens from possibly going to the scrap heap mounted on a process camera. I can’t find much info on it other than it has some pretty good coverage for a smaller lens. Any info would be greatly appreciated. Didn’t come with a shutter only a lens cap...which is perfect for me. Lol. 193379

[Pere Casals]

https://grossformatfotografie.de/attachment/3361-computar-f9-lens-brochure-pdf/

https://web.archive.org/web/20190718231838/https://grossformatfotografie.de/attachment/3361-computar-f9-lens-brochure-pdf/

Even the serial of the lens in thedatasheet (500616) is close to the one in your glass...

[Steve Goldstein]

Great find! Huge coverage, I think 95 degrees at f/22. It fits a Copal 3S shutter.

[Pere Casals]

I think 95 degrees at f/22.

I guess that datasheet says 72º wide open, 86º if well stopped, translation from japanesse is not perfect

[Dan Fromm]

Hmm. You may not be aware of this site's resources. One of the harder resources to find is the link in the first post in this https://www.largeformatphotography.info/forum/showthread.php?138978-Where-to-look-for-information-on-LF-(mainly)-lenses discussion. That link will take you to a downloadable list of links to useful information, including to a discussion of f/9 Computar lenses in this very forum.

[ic-racer]

it has some pretty good coverage for a smaller lens

If you are using it as an enlarging lens, I suspect it will work well with 5x7" format. Is that what you found?

[tmcsweeney]

I accidentally duplicated my thread

Moderator's note: threads merged. -- Oren

[Corran]

Should be in excess of 500mm, maybe even enough for 8x20...

[tmcsweeney]

whoa.. That would be awesome. Im going to have to try and mount it on my 8 x 10 and do some landscapes.

[Michael Kadillak]

Should be in excess of 500mm, maybe even enough for 8x20...

I owned one of the 270mm Computers in barrel and can confirm that in fact it did cover 8x20. Once I acquired the 305mm F9 Computar in Copal #3 (which really cover this format with plenty of room to spare) the 270mm was sold.

[Whir-Click]

Your find is truly excellent. I have this same lens: it covers 12x20 with a little room for movement. It’s also convertible to 475mm by removing the front cell. As mentioned above, the cells are a direct fit into a Copal 3S shutter.

It’s a rare gem and an asset in virtually any format.

[William Whitaker]

I have one of these also which I use for 12x20 and 14x17. It's an awesome lens and an amazing POV. Fortunately both cameras have rear focusing so I don't have to worry about the bed getting in the frame.

[tmcsweeney]

I would love to see some examples of images taken with this lens if anybody has any scans.