Mamiya Sekor 4/150 SF on K-10D

Oldhand · Posted: Sat Sep 20, 2014 4:50 am Post subject: Mamiya Sekor 4/150 SF on K-10D

What the ..............?
Yes, I know - an RB67 lens on an APS-C camera.
Lens was very cheap so I thought I would have a go.
Here are two images - my first attempts - one at f4 and the next at f11.
So far I can't see much difference.
More experimenting to come.
OH

calvin83 · Joined: 12 Apr 2009 Posts: 7554 Location: Hong Kong

I use many large medium to large format enlargers on my 5N too.

Does the lens comes with any Softness Control Disc? It is be nice to see the soft focus effect.

P.S. Here is the manual of the lens( in case you need) http://www.reznitsky.info/Mamiya/Doc/RB67_150mm_Soft_Focus.pdf .

tromboads · Expire: 2015-10-01

noting the lack of difference between f4 and f11, What was the pupil size once stooped down to f11. perhaps you were only just getting to the corners of the visible image circle?

Oldhand · Posted: Sat Sep 20, 2014 7:08 am Post subject:

Yes, Calvin it has the number 2 disc.
Daniel you may be right about that observation.
The adapter was made for me by a friend who has a lathe.
It is still raw silver aluminium inside and will need a paint with some matt black.
More experimenting to be done to see if I can get more from this lens.
OH

Oldhand · Posted: Sat Sep 20, 2014 9:54 pm Post subject:

The lens itself and its adapter setup.
OH