Reading resolution charts comparing MFT lenses to FX lenses

Started Mar 29, 2013 | Questions thread
MAubrey
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Re: Reading resolution charts comparing MFT lenses to FX lenses
In reply to Prairie Pal, Mar 30, 2013

Prairie Pal wrote:

Anders W wrote:

Prairie Pal wrote:

I'm at photozone review website browsing through lenses for both FX and MFT.  I see that the highest resolving FX lenses can be near the 4000 lw/ph range.  The better MFT lenses rarely even get to 2300.  Is the difference between the 2 types of lenses relative?

Not sure what you mean by relative but I certainly wouldn't call the difference real.

I think I was asking whether a "conversion formula" could be applied for comparing the relative ranking of a specific MFT lens within its peers to the ranking of a specific FX (or DX for that matter) lens within its peers.  Furthermore, I would like to understand if the performance of a number FX/DX legacy glass on thier respective sensors maintain their ranking when adapted to MFT, AND whether they outperform the current MFT lens offerings.

The discussions so far in this thread are starting to clear my understanding a bit.  A bit.

I'm currently very impressed with two unlikely Nikon lenses on my EM-5; Nikon DX 35/f1.8 & an old E 135/f2.8

Well...in the simplest terms, your 35mm f/1.8 and 135mm f/2.8 is likely to be be getting more lp/mm on the μ43 than they would on a 35mm format sensor (because the μ43 sensor is denser), but fewer lp/ph (because resolution doesn't scale linearly with pixel density).

You can see this analogously if you compare the resolution numbers of the Nikon D800's 36MP compared to the D700's 12MP:

http://www.lensrentals.com/blog/2012/03/d-resolution-tests

The D800 has three times the number of pixels, but it doesn't get three times the resolution because resolution doesn't scale linearly with pixel density.

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--Mike

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