Paul Howell
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If you think you are going to photograph a field of diagonal about 6" or 150mm: that is a magnification of about m = 1:4 on 35mm, and 1:2 on 6x6.
You will have a lens to subject distance of about d_object = f * (1 + 1/m), so for "normal" focal length lenses of 50mm and 80mm, that's about 250mm and 240mm respectively. IOW if you use normal length lenses on both formats, the lens to subject distance doesn't change much, which makes sense since they both have "normal" angles of view.
If you use longer-than-normal focal length lenses, you gain more working distance, but you need a lot of extension (focus travel or bellows).
I think this distance is about at the close limit of Rolleinars, and attainable with a Mamiya C with the 80mm lens, but not with the longer lenses like 135 or 180mm. Attached is a table from a Mamiya C manual that shows the minimum field size achievable with each lens.
For close ups of people (body art?) where you have a 3-d, not perfectly still, subject and are hand holding, I'd really be concerned about speed of operation and of parallax error in focusing, that is focusing on some spot that isn't quite where the taking lens is pointed.
I understand the desire not to buy more stuff than one needs, but there are good reasons why people use SLRs for close up work. I think either a parallax compensated close up like the Rolleinar, or an SLR with a normal lens + close up, or an actual macro lens, is indicated. If you did look at medium format SLRs, they unfortunately aren't cheap any more, but MF macro lenses are often surprisingly not overpriced (I suppose they are in less demand from the "must have fast lenses for blur" users).
VERY helpful thoughts - some initial thoughts/responses:
I'm planning to be hand-holding for most of this (it's close-ups of body parts of strangers, so a tripod setup is out, I think that rules out any TLRs without at least some indication of parallax error as well as any rangefinders or press cameras). I'm not terribly concerned about the different-angle-of-view problem of a TLR as long as I'm not mangling the framing. It also seems like if I could get one of the longer lenses (the 180 seems relatively available) on a mamiya C33/C330 that might help to minimize the angle-of-view difference since I'd be further from the subject.
Flat field of a true macro lens is also not required.
Image-quality wise, 35mm would be just fine (I'm not planning on making huge prints), but I was hoping to be able to contact print 6x6 (or bigger) negs. If i change my mind and go 35mm, I'll just grab something with at least 1:4 for my SRT-Super, any ole boring zoom lens or MF macro prime would probably be fine for this (but why do that when I could be having FUN with medium format!!?!?!).
able to get a full kit for much under $400
I just thought of one situation where using a SLR might have an advantage over a TLR, and that would be if you use polarizing filters to help control reflections. With some filters -- like a deep red, or neutral density -- TLRs are better than SLRs because the filter does not make your viewfinder go dark. But with a polarizing filter, it is far easier to use if you can see the effect of the filter in the viewfinder.
I just thought of one situation where using a SLR might have an advantage over a TLR, and that would be if you use polarizing filters to help control reflections. With some filters -- like a deep red, or neutral density -- TLRs are better than SLRs because the filter does not make your viewfinder go dark. But with a polarizing filter, it is far easier to use if you can see the effect of the filter in the viewfinder.
If you want a reliable 6x6 SLR, you probably will be hard pressed to find a system for $300, but sometimes you can find a nice Bronica SQ A, Ai, etc. with normal lens, finder, and back for a little under $500. $650 or so is more typical for a kit. The Zenza Bronica Zenzanon-PS Macro 110mm f4 will set you back around $200, but I don't think you'd need it. The Bronica 80mm normal lens uses standard 67mm screw in filters, so you could purchase a set of good close-up filters and do just fine.
Here are the recent prices:
SQ body $223 BGN (KEH)
SQ 120 back $116 BGN (KEH)
SQ 110mm f/4 Macro $153 BGN (KEH)
SQ Eye Level Finder $86 FAIR (Robert's Camera)
Total: $478.000
cheers,
Paul
Still perusing my used options, but thinking I'm most likely going with a 50mm macro lens on the SRT
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