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Some of my first photos with A6300

Started May 17, 2019 | Discussions thread
PHXAZCRAIG
PHXAZCRAIG Forum Pro • Posts: 19,651
Re: Some of my first photos with A6300

What power diopter?

I'm unfamiliar with diopters in general, but I don't see them causing significant loss of light.   I've just been reading up some on the subject, and the better term for these filters is 'close up lens with x diopter power'.

A 1 diopter lens focuses on infinity at a range of 1 meter.  A 2 diopter lens like I have for my 16-35 focuses to 1/2 meter.   And of course one can focus closer, which I assume is the point for using it in a dome port.   But my 16-35 seems to focus just fine without it.

In your case of a 6 diopter strength filter, that would be focusing to infinity at 1/6 meter, or closer, which does indeed seem pretty limiting.

I'm still trying to get my head around what they do, how they do it, and what tradeoffs there are.   I wonder if the reason a 2 diopter filter was suggested for my lens was in conjunction with a 70mm dome extension.  I use a 90mm extension, and perhaps that extra 20mm was necessary for use without a diopter.  I know that a 70mm extension was recommended for my lens and dome port size in the past.

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Phoenix Arizona Craig
www.cjcphoto.net

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