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| p.3 #3 · p.3 #3 · RhinoCam: 645 Medium Format back with Sony NEX body! |
Yes, building an f1.2 lens is generally a lot harder than an f2 lens. Low f-number requires thicker, more strongly curved elements, where easy-to-make spherical lenses deviate more from "ideal" aspherical shapes. There are a whole host of off-axis aberrations that blow up quickly in faster optics.
With fancy enough optics, it's not impossible to build a decent fast 35mm lens. The CV 35/1.2 is a $1400 optic with 3 aspherical lens surfaces. The M645 85/1.9 goes for ~$300 used, and is a simple double-gauss design from ages ago. I wish I could find the thread, but I remember someone did...Show more →
Good point about the Mamiya design. It is still relatively basic, although I would think that the sheer size difference would be an extra expense.
I agree about the medium format lenses, if we're talking about downsizing 645 to match 35mm. My 80/2.8 is great on my Hasselblads, but not exactly outstanding on my 35mm cameras. Since the smaller formats require more resolution, I would think it possible to get even better performance with this RhinoCam using some of the 35mm lenses out there, since they are often sharper than their medium format counterparts, but, like sebboh mentioned, you can frame the whole shot with the medium format lenses, which is nice. Cool gadget.