Equivalent focal length for MFT lenses

Started Apr 12, 2013 | Discussions thread
RichRMA Veteran Member • Posts: 4,073
Re: Uh, nope

David Kieltyka wrote:

draleks wrote:

There is a lot of talk about comparing lenses for MFT with APS or full format lenses. So I want to check if the following comparison is correct. If I have an MFT 300 mm f/6.7 lens, and a full format 600mm f/6.7 lens that is of a worse manufacturing quality and just happens to be twice as soft as the MFT lens. Then, on equal ISO values, those two lenses will be an exact match. Right?

The poorer quality of the 35mm-format lens will reveal itself quite clearly compared to the M43 lens. I've checked this stuff out under real-world conditions.

Now--if you mount the theoretical 600mm lens on the M43 camera via adapter, and the lens just happens to perform great in the center but totally stink towards the corners--you might end up with a useful ultra-long lens for M43 cameras. I own some lenses that perform okay on 35mm but noticeably improve on M43 due to their good center performance.

If what you're getting at is DOF stuff...that's a different subject altogether, and your notion about poor lens quality being an important factor is wrong.


I'd have guessed the lens could have looked worse, given the higher pixel density on the m4/3 than the FF, but lenses tend to fall apart more readily on the edges which would look worse, even if the center wasn't as good as on the FF.

Post (hide subjects) Posted by
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow