И ещё. Хотел бы пооцитировать слова самого компетентного специалиста по данному объективу доктора Kornelius J. Fleischer-а:
OK, here we go: At Zeiss, we see the Biogon 4.5/38 as a documentation tool, able to record as many details as possible regardless of the position within the frame. As such, we want the Biogon 38 to deliver even performance over the entire frame. With the new version of the Biogon in the Hasselblad SWC 905, we were able to increase the performance in the corner, at a very slight expense in the center, compared to the previous version as used in the SWC 903. This expense is most probably unnoticeable in practical photography, given the resolving power of color film with its limits far lower than the Biogon's.
This is what I achieved with my SWC 903 in terms of resolution (using Agfa APX 25 B&W film, which resolves up to 200 linepairs per millimeter): Center: 200 linepairs per millimeter, Edge: around 140, Corner: 100 For comparison: The color film with highest resolving power, Fuji Velvia, achieves no more than 160. Kodak Ektachrome types achieve around 130. If we now resolve more in the corners, and slightly less in the center, Fuji Velvia will only benefit from the improvement in the corner, not losing anything in the center.
While for most photographers, sharpness may not even be different between the two versions of the SWC, one aspect is visibly better with the new 905 version: stray light suppression is clearly improved over the 903.
I hope this helps
