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Old Sep 17, 2020, 8:46 AM   #1
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Default Reason for thickness of 500D close-up lens

I have a couple of sets of close-up filters with varying strengths (+1,+2,+4,+10); but none of them are as thick as the Canon 500D, not even the +10. Does anyone know the reason for the thickness of the 500D?
...... john
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Old Sep 17, 2020, 8:43 PM   #2
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Close-up lenses only try to project a sharp image at the center, while the 500D (and the 250D,btw) tries to project a sharp image over the entire sensor. It has a more complex optical design, so it's bigger and more expensive.
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Old Sep 18, 2020, 3:54 PM   #3
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G'day John

Many "close up lenses" (they are NOT filters) consist of a single piece of glass, curved such that their point of focus / focal length is less then one metre. But the edge sharpness and colour accuracy is less than ideal

Some lens makers - and Canon is one of them - glue two pieces of glass (now called elements) so that the edge sharpness and colour accuracy improves considerably. These lenses have the description of 'Achromatic ' (see wiki if needed)

Canon + Raynox + Olympus + Nikon + several others all make Achromatic closeup lenses for sale to we keen photographers
ps- if you want my PDF describing closeup lenses email me your details "phil jones"<[email protected]> is my public email address

Hope this helps
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Old Oct 11, 2020, 5:25 PM   #4
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I'm trying to read more about this close up lens/filter, but can't find much information with google.

I'd like to use it (the 77mm version) with a 70-200mm 2.8 IS II, would the result be comparable with a regular 100mm macro lens?

Kodi nox

Last edited by adomanim; Oct 23, 2020 at 4:04 PM.
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