Mamiya 645 lenses on the Sony

If anyone is interested in buying Mamiya 645 lenses, I just listed six "N" and "A" lenses for sale here.

Right now I'm pondering whether 110 or 150mm would be preferable for portrait. No idea on that
(also the bulk of the 150 scares me a bit, but the 110 doesn't look that tiny either)

Deepcore wrote: Thanks Terry! My next "dumb" question for the room: I asked on a different thread and found out that the crop factor of my A55 would not give me a 500mm using a 80mm medium format lens (my exageration). But that the 1.5X is still a factor. My question is, since the 80mm medium format is the equivalent of a 50mm on a 35mm...does that mean that the 80mm on my A55 would be a 75mm (or a 120mm)?

I don't think so. The focal length is the focal length is the focal length. The thing that changes is the field of view. So as I understand it, an 80mm medium format lens on a FF camera would have exactly the same FOV as a 35mm 80mm lens on a FF camera but on a medium format camera it would be wider.

Thanks guys!

This is really intriguing...something to consider adding to the arsenal.
Always wanted to use medium format but like the instant feedback of digital capture.
But also can't shell out the cost of medium format with digital capture either. Maybe when the kids are done with college.

The decision has been made, I ordered a 150/2.8 !

haha brilliant! Post pics to this thread when you test it :)

glefebvre wrote: I just picked up the Fotodiox Pro adapter and I'm having some exposure issues with my A900. I'm shooting manually at 160 ISO and if I meter on a subject it also seem to over expose the image but if I meet and then adjust to about a -2EV, it's a decent exposure. Any tips on what is the best way to meter with these Mamiya lenses? I've got a 35, 45, 55, 80, 120 macro, 150, 200 APO and 300 and would like to make good use of them.

Hi,

You have a good collection of Mamiya 645 lenses there!

I don't have any problems metering with my A77 using the following method:

+ have camera in A mode;

+ have lens wide open;

+ use camera dial to match the "requested aperture"
to the maximum (widest) aperture that the camera assumes the lens has;
with an unchipped adapter such as the Fotodiox Pro this aperture value is probably F1 or similar;
[Actually this step used to be necessary on my Konica-Minolta 5D
but on my A77 with firmware 1.06 and an unchipped adapter
it doesn't seem necessary:
the A77 just shows F-- for the aperture on the top LCD
and F0.0 for the aperture on the EVF display]

+ focus the lens wide open;

+ change the lens to the shooting aperture
(but don't change anything on the camera)

+ press shutter to take photo.

P.S. If after using this process you still want to override the camera's metering occasionally,
still stay in A mode and use +/- exposure compensation.

P.P.S. With the A77's focus peaking I can usually simplify the process by focusing with the lens already stopped down to F4 or F5.6
I don't know whether that would be doable on the A900.

All the best,
Terry

Edited by terryg - 13 March 2013 at 21:29