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Larger diameter close-up filter and corner image quality

Started 10 months ago | Questions thread
Dak on cam
Dak on cam Senior Member • Posts: 7,732
Re: Larger diameter close-up filter and corner image quality

RGBRGB wrote:

Has anyone tried to use a larger diameter close-up filter to improve corner image quality (sharpness and chromatic aberration)?

Late answer: that doesn't make sense.  Sharpness problems and chromatic aberration increase with lens diameter since this increases lens thickness and it increases the area from which light has to converge to each image pixel.  A larger diameter may allow for wider zoom and cause less vignetting particularly with wider apertures (who uses wide apertures for macro though?).  But in terms of image quality it doesn't help.

Using an achromat is the ticket here as long as we are talking closeup filters.

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Dak

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