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Samples: Mamiya 645 A 150mm f/2.8

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Winwalloe View Drop Down
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Post Options Post Options   Quote Winwalloe Quote  Post ReplyReply Direct Link To This Post Topic: Samples: Mamiya 645 A 150mm f/2.8
    Posted: 11 December 2013 at 22:04
Samples: Mamiya 645 A 150mm f/2.8

mount: Mamiya 645 manual focus
format: 645
year: unknown
max aperture: 2.8
min aperture: 22
elements/group: 6/4
aperture blades: 8
min focus distance (mm): 1500
filter diameter (mm): 67
length (mm): 107
weight (g): 740

additional information:
features a built-in lens hood
the adapter adds about 2cm in length for using on an A-mount camera

The bulk including the adapter can be compared to the Minolta 200/2.8, and it's shorter than the beercan:



The lens on the A99 looks like this (hood recessed):



Hood extended:

See my webpage!
A-mount stuff, and few 43 stuff.
 



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Winwalloe View Drop Down
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Post Options Post Options   Quote Winwalloe Quote  Post ReplyReply Direct Link To This Post Posted: 11 December 2013 at 22:07
This lens is sharp, and very, very nice to use: the focusing ring is smooth and easy to adjust. Aperture setting goes by full stops.

It's important to use the magnifier rather than focus peaking to ensure correct focusing. Long focal length + larger aperture makes focusing error visible until a very long distance, and peaking won't provide enough accuracy.


No issue on those shots!

The adapter is a Chinese no-name one, purchased on amazon.de for 40 or 50eur.







See my webpage!
A-mount stuff, and few 43 stuff.
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Winwalloe View Drop Down
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Post Options Post Options   Quote Winwalloe Quote  Post ReplyReply Direct Link To This Post Posted: 11 December 2013 at 22:19
I found 3 type of problems with my lens/adapter/camera combo.


1. The top of the picture is dark at 2.8, as seen below






2. Flare when a bright light is placed at a precise place. This might be due to a spec in the lens, maybe the front element has a very tiny crack.



When changing position, it's a little less terrible:




3. Ghosting, ugly, ugly ghosting. I get this much more easily than #2

See my webpage!
A-mount stuff, and few 43 stuff.
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pegelli View Drop Down
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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 26 May 2015 at 13:54
Have you tested problem 1 with EFCS off, if not it's probably caused by that and not a problem with the lens (since the shots are at 1/4000 and 1/8000 which can give uneven illumination when EFCS is on.

Agree problem 2 and 3 are probably caused by the lens and there is probably little you can do about it. Only idea is to test a longer hood, since the FOV on an A99 is smaller vs. the 645 system the lens is designed for.
Mind the bandwidth of others, don't link pictures larger then 1024 wide or 960 pix high, see here
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Alex H View Drop Down
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Post Options Post Options   Quote Alex H Quote  Post ReplyReply Direct Link To This Post Posted: 26 May 2015 at 16:39
Make sure the adapter is properly blackened inside too.
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darosa View Drop Down
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Post Options Post Options   Quote darosa Quote  Post ReplyReply Direct Link To This Post Posted: 26 May 2015 at 22:55
This Mamiya is a great lens!

But especially medium format pre-digital lenses can cause a 'hot spot' somewhere in the centre. This may be the problem in #3.
It is caused by the sensor reflecting light on the blades of the iris (or other parts not sufficiently blackened).

Shooting wide open and avoiding strong light on the sensor helps.
 



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Winwalloe View Drop Down
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Post Options Post Options   Quote Winwalloe Quote  Post ReplyReply Direct Link To This Post Posted: 01 March 2016 at 21:56
It's of course harder with a long focal length to have a sharp photo, considering this adapted lens doesn't communicate the focal length info to the DSLR:

See my webpage!
A-mount stuff, and few 43 stuff.
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