elflord said:But I don't see how the fact that the tele lens is built for full frame makes it that much heavier or more expensive. Most of the weight is needed because of the required size of the front element. You might be paying (money and weight) for unneeded extra optics to ensure that the image quality is up to scratch full frame corners, but I think the "bulk" of it largely goes to the necessary large size of a lens that long (even though that one isn't especially fast).
I didn't know so much is dependent on the front element, so that's a bit relieving. However, it would be interesting to know how much tele lenses would cost if they didn't care about corner sharpness and it would still produce the same pictures on aps-c. But in the case of the 70-300L the reviews said they maybe did just that - it's said to be a bit soft in the corners on ff.
elflord said:One thing is for sure -- you're not the only one who wants a full frame as evidenced by the fairly robust demand. The good news is that there are three generations worth of 5D series bodies to choose from, so there's almost certainly something at a price you can afford.
The bad news is: The combination of the two things you wrote ff body prices are still high, so until an application really needs a ff sensor, I guess I'll continue to buy ef lenses rather than a ff body :-o ... and I really would like to try the 5d2 if I could, it is an older generation than my 60d and the af and auto wb is said to be outdated, I don't know how much that would bother me.
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