Originally posted by wolfier You can't, unless all of your lenses are APS-C lenses. Any 35mm lens that you use on an APS-C body, you're wasting some money buying portion of the lens you are not able to use.
I don't have any authoritative figures handy, but I feel pretty confident that about 98% of the people buying new digital cameras are NOT planning to use old 35mm film camera lenses on them. Compatibility with film SLR lenses was a transitional advantage for DSLRs. I think we are WAY beyond that now.
The APS-C sensor may have been a compromise, to save money. But so was the original idea to let digital SLRs use the same lenses as film SLRs. So at first, we had APS-C sensors being used with old lenses—introducing the crop factor. Then, rather ironically, just about the time that the 36x24 sensor is starting to become a player in the market, so are lenses designed specifically for APS-C.
Olympus, with the four-thirds idea, actually had the courage to ask, "What if we redesign the digital, interchangeable-lens camera from scratch, without concern for the past?" I understand that 4/3 and micro 4/3 hasn't perhaps been a huge success, yet, and may never be. But I give 'em credit for originality.
Quote: Medium format is not a standard, not by any measure. I'd say currently the standards are APS-C and 36x24.
I never said medium format was a standard.
Quote: Advantage is advantage - all advantages are comparative advantages, and all comparative advantages are advantages. There is no such a thing called "absolute" advantage in the world. So just call it advantage.
Well, "absolute advantage" isn't a technical term, but I thought what I meant was clear. Apparently not, so let me clarify. BY "absolute advantage," I simply mean an advantage that doesn't just make something better (faster, easier, etc) but rather an advantage that makes something possible that simply isn't possible without it. An interchangeable lens body can change lenses; that is what I'm calling an "absolute advantage" over fixed-lens cameras. A Pentax waterproof camera like the W90 can be used underwater; my K20D can't. The K-7 and K-x can shoot video; my K20D (or somebody else's old Canon 5D) can't. A lens that supports auto-focus has an absolute advantage, at least in that one respect (and assuming you care about autofocus) over an old manual-focus lens.
My point was, that 36x24 cameras have no
absolute advantages over APS-C cameras.
To say this doesn't mean that 36x24 doesn't have ANY advantages. But absolute advantages make certain buying decisions easy. Relative advantages make buying decisions hard. If I am buying a new camera, and I know that I absolutely need to generate 25+ MP files to submit to my editor, well, that limits my buying options. (Here the sensor resolution, which I think is usually a relative advantage, has become an absolute advantage due to some external requirement.) But if I'm buying a new camera and my choices are, say, K-x or K-7, I'd have to think about it for a bit. I can do all the same things with both cameras. The K-7 may have a relative advantage here or there, but the K-x has some relative advantages of its own (lower price, slightly better high-ISO performance).
If a whole lot of people ABSOLUTELY NEEDED the advantages of 36x24 sensors, then we'd never have wasted a decade with APS-C cameras. Pros didn't switch to digital until cameras acquired sufficient resolution to make medium-to-large prints, which pros absolutely required. Nowadays, as digital publication (via Facebook etc) becomes the default method of distribution of photographs (much to my dismay), the advantages of full-frame cameras are needed less than ever by the majority of people taking photographs. Sheesh, I know a LOT of people who think their 6-8MP phone camera is GREAT!
Will