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IQ difference at nearly same settings?

Started Jul 30, 2015 | Questions thread
forpetessake
forpetessake Veteran Member • Posts: 5,172
veiling glare
1

rolfaalders wrote:

I'm not sure I'm familiar with the term veiling. What is the cause of this? A front element being not clean?

Veiling glare is stray light in lenses and optical systems caused by reflections between lens elements and the inside barrel of the lens. It predicts the severity of lens flare— image fogging (loss of shadow detail and color) as well as "ghost" images that can occur in the presence of bright light sources in or near the field of view.

All lenses even in perfect condition show this effect to some degree. The dust on glass surfaces, chemical changes in the glass (most frequently happens to the old APO lenses), dirty or poor quality filters, etc. can significantly increase the VG.

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