M39 enlarger lens image circle

D Cox wrote:

Viernes wrote:

D Cox wrote:

Viernes wrote:

I was thinking of using my old enlarger lens on a DIY belllows to shoot macro, but I was wondering what the image circle was. It's a M39 mount Nikon.

Thanks!

What focal length ? The longer the focal length, the larger the image circle.

Any EL-Nikkor from 50mm up will work fine for macro on the full frame (or smaller) formats. The 63mm is particularly good.

The further the lens is from the sensor, the larger the image circle.

Use an aperture of about f/11 to avoid diffraction blur.

Sorry, you’re right, I skipped some information.

It’s a 50mm f2.8.

A good lens.

Yesterday I did some freelensing with an Olympus EM5.

Other than massive purple fringing the results where fine.

I would not expect to see purple fringing with that lens on a bellows.

Here's a quick test. Magnification is about 2.5X.

There was a little bit of red/cyan fringing, of the kind that is easily corrected in PP. No purple fringing.

Vibration is already beginning to be a problem at that magnification. It would be best to use flash for lighting. This test was in daylight, and there is some loss of sharpness I think.

I was thinking of making a bellows that could attach different bodies/mounts (I use Pentax K and m4/3 bodies).

I suggest buying a cheap PK mount bellows, an adapter from PK to M4/3, and an adapter from M39 to PK.

It really is not worth spending your valuable time on making a bellows.