Mamiya hood (42mm clip on) on Jupiter 8

[Igor Burshteyn]

I have Mamiya hood from 80mm f2.8 - 42mm clip on. It hides 1/4 of viewfinder on my kiev4/jupiter8, finished better than Jupiter 8 itself and costs probably more than Jupiter 8 with kiev body together.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=3352&item=7506787585&rd=1

The question is whether it can be used as hood for J8 - as far as I understand med format 80mm field of view should be as 50mm one in 35mm format.