What is holding Sigma back with the new Merril(s)?

Started 5 months ago | Discussions thread
xpatUSA Forum Pro • Posts: 19,923
Re: What is holding Sigma back with the new Merrill(s)?

Tom Schum wrote:

xpatUSA wrote:

mike earussi wrote:

The Merrill's max resolution is 100LPM which can easily be reached using Sigma's best glass ...

Indeed, as I just posted, their 65mm DG DN can do over 160LPM at MTF50 which "beats" the Merrill quite handily.

On the fp L, with its anti-alias filtering, I wonder what the usable resolution is.

Numbers, numbers to the rescue ...

The sensor has 6720 pixels in 36mm, I think you said. So that's 187 px/mm or 93 lp/mm.

Taking "usable" to mean visible, objects are distinguishable down to 9% MTF below which point they are not.

So the question would be:

In a MTF curve, at what lp/mm would the MTF become 9%?

Although the question normally asked is " what lp/mm give an MTF of 50%?" ...

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Pedantry is hard work, but someone's gotta do it ...

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