What Lens Specification To Look For Sharpness At Distant Subjects When Cropped??

Started 2 months ago | Discussions thread
lehill
lehill Veteran Member • Posts: 6,114
Re: What Lens Specification To Look For Sharpness At Distant Subjects When Cropped??

rpszone wrote:

Take two, different, 200mm lenses, same body and subject at 100 feet. Which one can crop better with sharpness and clarity?

Do I look at "perceived megapixel" rating, "resolving power", what makes one lens better than the other for this task?

Each reviewer that quantitatively tests lenses has developed their own test rigs, methods, and means to express their results (eg, perceptual megapixels, blur units, lp/mm, etc). The camera+sensor used also has a big impact on results. This means you can't directly compare results between reviewers (eg Optical Limits vs Imaging Resource).

It's great when you can find one reviewer that has run their tests using the same sensor on the lenses you're interested in (example).

The one thing we have that's kinda universal are the theoretical MTF curves that the lens manufacturers publish. Even those are tricky to use for comparison purposes. This article is a primer about reading MTF curves.

Example MTF curve for Sony SEL90M28G

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Lance H

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