I have a 127mm and a 180mm in the KL version but I have been told they are not really floating element lenses but just a dof guide. Can someone confirm this please? I was told the 50mm C lens is a floating element though.
...of the C-lenses, 50, 65 and 140mm macro have manually set floating elements to correct distance-related abberations. These lenses should work just as well at close distances as they do at infinity. The floating element control looks like a focusing ring and has a certain resistance to turning - you are, of course, using it to move several 'chunks' of glass. In contrast, the depth-of-field ring on your 127 and 180mm lenses will turn with almost no effort. That's how you can easily identify the the difference.
...not quite right: all 50mm (C and non-C) for RB 67 have floating elements. 65mm non-C don't have floating elements - these lenses, with a wasp-waisted profile, are quite rare. The most common version is the 65mm C and this does have floating elements. I thought all 140mm macro had floating - but I may be wrong.I believe that there are two versions of the 50, 65 and 140 for the RB. One with and one without the floating elements. The floating elements help to get your corners in sharp focus. I owned the 50mm ULD (floating element) lens for the RZ67. There was also a cheaper in price, non ULD lens for the RZ too.
...not quite right: all 50mm (C and non-C) for RB 67 have floating elements. 65mm non-C don't have floating elements - these lenses, with a wasp-waisted profile, are quite rare. The most common version is the 65mm C and this does have floating elements. I thought all 140mm macro had floating - but I may be wrong.
Have to correct myself: the 75 KL is floating too. Also, ring s clearly engraved with FLOATING SYSTEM, just cannot miss it.90 KL has floating element too. I don't think any lenses that have it do not say so right on the adjustment ring, the ring is clearly marked "floating element" . 75/127/180 do not have it for sure.
[QUOTE="....am unsure of what "NB" means but strongly suspect it equates to "New Barrel" which is also used for the 90 / 127mm, there is no mention of the 140 in the "Pro-S 76.1" brochure.
- the 140mm macro is a post-1976 lens?
I have a 127mm and a 180mm in the KL version but I have been told they are not really floating element lenses but just a dof guide. Can someone confirm this please? I was told the 50mm C lens is a floating element though.
Cheers.
I have the brochure for SD with same 2 page spread, so what I wrote is what it says.The 1978 Bell and Howell/Mamiya RB67 Pro-S system chart I have in pdf format lists the 140mm f/4.5 C macro lens with floating element.
The 140mm macro lens is the only one that has any reference to a floating element, and that is hard to read, because the chart was apparently over a two page spread, and it has been scanned in two parts, and the lens description is half in one part, and half in the other!
I believe the K/L 65/75/90 are floating element lenses. I don't think any telephoto's are, but perhaps don't quote me as this is just from memory.
...
Further, according to Mamiya's RB Pro SD brochure, following lenses have floating mechanism: 50/65/75 (not shift one)/90/140
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