diopter for macro

[Roger Lee]

I'm thinking about doing some macro video...insects, flowers etc. Just for my hobby. These are two diopters that were recommended for my XH A-1.

Century Precision Optics | AD-7220 +2.0 Achromatic | 0AD-7220-00

Century Precision Optics | AD-7235 +3.5 Achromatic | 0AD-7235-00

A couple of questions to anybody caring to respond:

How do I determine what magnification these are and how close do they focus? How sharp are they do you think?

I've tried Century Optics website and can't find much information on them. The macro shot that they show is the same for both diopters.

Any information would be appreciated.

Thanks

Rog Lee

[Bill Pryor]

Century adapters are good quality, a bit expensive. A +2 should get you in really close. You might could go to a still camera store and get a +1 a lot cheaper and try that out first.

[Tom Hardwick]

Originally Posted by Roger Lee

How do I determine what magnification these are and how close do they focus? How sharp are they do you think?

Your camera without a close-up lens focuses on infinity. If you add a +3 dioptre (say) you camera (at infinity) now focuses at 1/3rd of a metre. A +2 diopter at half a metre and so on.

You can stack them so a +2 and a +3 gives you a +5.

Unless they're cemented doublets they're not so sharp in the corners I find, though it's aperture dependant. I'd go for a +3 as it's a good all-rounder and useful to have in your kit bag.

tom.

[Roger Lee]

Thanks for the info and thanks for taking time to reply.

[Greg Rothschild]

The Canon 500D is very good also. I have the Century Optics 3.5 and 500D. Sometimes I go crazy and put both on there :)