Am 15.01.25 um 17:09 schrieb ann sanfedele:

Thanks, Ann, but I'm so happy that (a) I've had an idea and (B) found an
object to realise it and (c) a good title that I didn't want to give up
yet.

Still, there was a technical prob: I could get a half decent photo using
my SMC-M 4/20 mm and a 12 mm extension ring on the K-3.

BUT... the DOF was minimal because the K-3 wouldn't stop down the lens
with the extension ring mounted. It did so with the lens only. The ring
has the lever to transfer the stop-down command from the camera to the
lens but the camera didn't want to move it. Could this be because the
extension ring doesn't have any contacts? Then again, the SMC-M lenses
don't either and there the stop down mechanism works, albeit only
without the extension ring.

Eventually, I had a look at the rear of the ring. Beautiful black enamel
on the surface that touches the camera's contacts. Could it be...? Out
with the dremel and away with the enamel...

Ha! It works now. :-)

Ralf

--
Ralf R. Radermacher  -  Köln/Cologne, Germany
Blog  : http://the-real-fotoralf.blogspot.com
Audio : http://aporee.org/maps/projects/fotoralf
Fotos : https://www.fotocommunity.de/user_photos/770012

Focus stacking will be your friend to get DOF even with wide open aperture.

Henk

Op 2025-01-15 om 19:19 schreef Ralf R Radermacher:

Am 15.01.25 um 21:06 schrieb Henk Terhell:

Might be a little difficult with a MF lens. But the prob has been solved
and the photos I've now been able to shoot at f16 are OK.

Ralf

--
Ralf R. Radermacher  -  Köln/Cologne, Germany
Blog  : http://the-real-fotoralf.blogspot.com
Audio : http://aporee.org/maps/projects/fotoralf
Fotos : https://www.fotocommunity.de/user_photos/770012