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There are two unrelated issues here:
1 - Ability to focus at the distance required for the desired magnification.
For 1:1 ratio, the lens must move forward from its infinity focus by a distance equal to its focal length.
Some macro lenses for smaller formats have enough range in the focusing helix to achieve a 1:2 ratio.
Short FL lenses may have enough helix for 1:1. Any lens can do that using a bellows or extension tubes.
2 - The amount of distortion present in the image at that distance.
Regular lenses are optimized for magnification ratios of 1:10 or 1:20, appropriate for general photography.
Outside of this distance, distortions increase. When used with a bellows or extension rings, quality suffers.
Macro lenses are optimized for much shorter working distances, with 1:2 or even 1:1 ratios.
If used for general photography (longer distances), distortions will increase.
- Leigh
That's for you to decide.So what is the recommendation?
That's for you to decide.
It depends entirely on what you want to accomplish, and with what existing equipment.
It's just like the basic choice of a format, and then of a camera for that format.
There is no single "best" choice. Each option has advantages and disadvantages.
- Leigh
I choose the format, 35mm to 8x10, based on how large I want the image to be.Therefore, don't forget about the film format you are dealing with when using terms such as 1:1 magnification, and especially remember that as a practical matter a 1:1 magnification is not much of a close up shot on large format film.
+1.......I also have the two extension tubes but rarely use those. The 140mm is an amazing lens for macro or closeup work. And, it works great as a slightly longer then standard focal length lens too.The 140mm macro lens for the RB67 is quite good, available used at reasonable cost, and usable on the RZ67 as well.
My "small" RB kit includes two lenses: a 65mm and the 140mm macro lens.
Well, i mentioned above which camera bodies i will use, 2 Mamiyas and 1 Hasselblad and a large format 4x5, i was clear about which format i will use.
Also, i wanted to shoot only close ups detailed items or subjects, not a general purpose lens that i can use sometimes for close ups, so i mean a dedicated macro lens, filling the frame or almost filling, but if in film format there isn't such a thing then in this case i don't know which lens to get.
I mentioned the bodies above which means only MF [6x6/6x7 and maybe 6x4.5 with different film back] and LF [4x5].
One warning: Depth of field can be a real challenge with larger formats and closer focussing!
Read about it first. Buy a copy of Lester Lefkowitz' book The Manual of Closeup Photography, available used at reasonable prices from vendors on abebooks.com, alibris.com, amazon.com, ... And study it. The ideas in it will help you understand how to do things and how to analyze failed shots.And this is a real fun or or as you called it "A challenge", so it will force me to shoot more to understand it or get it right.
Read about it first. Buy a copy of Lester Lefkowitz' book The Manual of Closeup Photography, available used at reasonable prices from vendors on abebooks.com, alibris.com, amazon.com, ... And study it. The ideas in it will help you understand how to do things and how to analyze failed shots.
The Hasselblad has fixed length extension tubes, a harder to find variable extension tube and bellows.
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