New Pentax 70-200mm F2.8

Started Oct 5, 2012 | Discussions thread
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jeanphilippe Goube Senior Member • Posts: 1,586
Re: Looks APS-C lens to me

il_alexk wrote:

From the photo-rumors:

"One more thing – this lens is “almost” full frame with image height of 21.64mm (full frame image height is 23.9-24.3)"

If this is true, the extra image size is likely to be used for the SR and horizon correction functions by APS-C cameras and will not fit the FF DSLR if Pentax decides to make one.

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Cheers,
Alex

Wrong; the misunderstanding is that the word image height was used by photorumors instead of image circle (radius).

The image circle for a FF lens is sqrt(12*12+18*18) = 21.633 precisely

Cheers

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jpgoube

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