Is a 300mm @21mp same as a 600mm@10mp?

Started Nov 14, 2008 | Discussions thread
Victor Engel Forum Pro • Posts: 18,487
Simple formula

This applies to distant subjects where the lens is not diffraction limited.

Multiply together:

Focal length
Crop factor
Pixel count in horizontal dimension (not MP count)
Teleconverter multiplier

If the resulting number is higher, you can resolve more detail.

From this number, you must back off a bit for things like diffraction and softness introduced by adding extra elements, if appropriate (if using a teleconverter).

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