My math is starting from the 645 film frame with a 75mm diagonal, not the 35mm diagonal. The 35mm mamiya lens is the equivalent of a 16mm lens for 35mm format. With the 1.5 ratio, that would be a 24mm lens on the d200? Out and out, the lens IS a fisheye, or at least close to one. The same math would make the 80mm mamiya lens a 56mm lens on the d200, still a normal lens, not a tele. Other than auto features, i'm wondering if i'm losing anything. I do like my mamiya glass and have invested some cash into it. ANDY?! --- Elgenper <elgenper@xxxxxxxxxxxx> wrote: > 10 jun 2007 kl. 21.24 skrev trevor cunningham: > > > hey gang, > > > > was hoppin' around ebay and found an interesting > > product...an adaptor to fit any mamiya 645 lens to > a > > nikon d200...i have such equipment, and, > coinkidinki > > being, intend on purchasing a d200...just > wondering > > what type of focal length and perspective > translations > > are implied if i have a 35mm 645 lens pointed at > the > > d200 sensor...or my 80mm at that...i believe the > > equivalent for a 35mm camera is around 16mm, but > my > > math could be way off...would that make it like a > 24mm > > lens on the d200? too lazy to look into the math > that much > > Just multiply the true focal length by 1.5 to get > the "equivalent > focal length" for a 35 mm camera. The fact that the > lens was > intended for another format than 35mm is of no > consequence for the > maths here. > > So your 35 mm lens will give the same field of view > as a 52.5 mm lens > on a 35mm camera; so it will work like a "normal" > lens (in fact, > inexpensive used 35/2.0 AF Nikkors are popular and > convenient as > normals for the D200). An 80 mm lens would work > like a 120 mm lens > does on a 35mm. > > Obviously, there are practical problems and > considerations: no > autofocus, no auto stop down, no exposure metering. > Also, since the > Mamiya lenses were optimized for a far larger > format, it may well > have far lower resolution than lenses made for a > digital Nikon. > > So, honestly, unless you have some more special > optics for the Mamiya > (a bellows with short-mount macro, or a very long > tele lens), it´s > probably not worth the hassle. In your case, you´ll > just get a very > slow working normal... > > > Per Öfverbeck > http://ofverbeck.se > > "In a world without walls or fences, who needs > Windows or Gates?" > > > "The optimist believes this is the best of all possible worlds. The pessimist fears it's true" - J Robert Oppenheimer ____________________________________________________________________________________ Looking for a deal? Find great prices on flights and hotels with Yahoo! FareChase. http://farechase.yahoo.com/
