Jim S started the thread and has been a good inspiration. It is up to you to contribute if you wish, the thread will probably gain momentum and then slow down again, as they do. It's not over until people stop posting.
As for pricing, the idea of mounting Mamiya lenses to digital platform is not new, but not that wide spread either. Mamiya 645 lenses can be bought in many places for good prices, in some cases - really good prices. You have to look around and perhaps realize that *Bay and some other internet based vendors target the people that are into cross platform systems and know they can charge you for it. I have found all my alt. lenses elsewhere for way better prices, at ordinary shops. Some with web sites, some without. Just look around and you will find plenty of Mamiya glass.
Got my adapter two days ago, had the opportunity to try and get some winter shots in Stockholm today but, to my disappointment, the Cirrus adapter does not reach infinity, quite far from it actually.
kosmoskatten wrote:
Got my adapter two days ago, had the opportunity to try and get some winter shots in Stockholm today but, to my disappointment, the Cirrus adapter does not reach infinity, quite far from it actually.
kosmoskatten wrote:
Got my adapter two days ago, had the opportunity to try and get some winter shots in Stockholm today but, to my disappointment, the Cirrus adapter does not reach infinity, quite far from it actually.
Is this the case with just one Mamiya lens or is it the same problem with several? When I received my 200mm APO I had to adjust its infinity focus. If it had been my only Mamiya lens I might have been somewhat inclined to think the adapter was to blame.
kosmoskatten wrote:
Got my adapter two days ago, had the opportunity to try and get some winter shots in Stockholm today but, to my disappointment, the Cirrus adapter does not reach infinity, quite far from it actually.
I realize you paid a fair bit for the adapter and that you are anxious to use your lens. If I were in your position I might consider hacking the adapter to make it work. I am not familiar with the Alpha mount but the fit looseness may be more of a concern than infinity focus. Unless lateral play is corrected evenly you in effect have a tilt lens whether you want it or not.
If the mounts on each side of the adapter are working properly (holding firmly with no play) the way to resolve the infinity issue is to somehow "shorten" the adapter.
I looked at some pics of the Cirrus adapter on their web page but the pics are not great. It might be possible to make an adjustment on one side of the adapter or the other.You could try a careful disassembly and look for thin spacers or shims that may be removeable to decrease overall adapter thickness. I think this is very unlikely but may be worth a shot.
It may be that you could remove the components on the Mamiya side of the adapter, machine down the corresponding face of the spacer tube and reinstall the removed components. If the lens isn't getting close enough to the sensor to get infinity focus.....material has to be moved.
How about posting some pics of the adapter on this thread?
pengland; thanks for the reply. I received word from the guy at Cirrus adapters and he will try and find me a better fit based on the model I use (A900).
The play when focusing is due to the locking pin groove being too large, I can fix that so the main issue is the adapter thickness. I asked for a thinner one if possible and I will have mine exchanged. If the next one does not fit either I am all open for mechanical recombobulations of the adapter.
There is a small protruding rim on a metal ring, inside of the lens mount, that extends past the lens mount by a mm or so. I tried removing it as it was grating against the adapter and I thought that might solve it but I only gained a fraction of focusing towards infinity and I am still shy of reaching it. I will have a look at the adapter later today and see if I can work something before sending it back but I am not too sure about it.
Kosmos,
As they say "when you are given lemons make lemonade" You still have an outstanding MACRO lens.So hey put up some macro shots in the meantime.
-Jim
A question:
While looking up for mamiya medium format on keh, i noticed this "The 45 f2.8 is one of three wide-angle lenses available for the Mamiya 645 series of cameras. Equivalent to a 28mm lens in 35mm format it could be just the lens."
Why should 45mm of a medium format be equivalent to a 28mm on 35mm? If anything, shouldn't it have a smaller FOV than a medium format equivalent, since 35mm sensor is smaller?
shoenberg3 wrote:
A question:
While looking up for mamiya medium format on keh, i noticed this "The 45 f2.8 is one of three wide-angle lenses available for the Mamiya 645 series of cameras. Equivalent to a 28mm lens in 35mm format it could be just the lens."
Why should 45mm of a medium format be equivalent to a 28mm on 35mm? If anything, shouldn't it have a smaller FOV than a medium format equivalent, since 35mm sensor is smaller?
MF sensor/film plane is larger than 35mm, so a larger 'crop' of the projected image is captured. Therefore a 45mm on MF would be an equivalent angle of view as a 28mm on 35mm.
shoenberg3 wrote:
Why should 45mm of a medium format be equivalent to a 28mm on 35mm?
On it's own native format (645 film) the angle of view is equivalent to 28mm on the 135 format. They write that because for most people the focal lengths in the 135 format are their reference for the angle of view for a lens. They didn't write that with the practices of adapting to dlsr's in mind.
You still have an outstanding MACRO lens.So hey put up some macro shots in the meantime.