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04-13-2012, 05:33 PM   #1
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step down ring or step up ring ?

i want to go from the 58mm size of lens to a 55mm lens tube, which is it that i need--- to step up or step down ? is there a standard on this for every manufacturer ? thanks

04-13-2012, 05:35 PM   #2
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That is step down because you are going smaller in size. Same idea as stop down for the aperture.
04-13-2012, 05:47 PM   #3
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that's kinda what i thought, but was not quite sure.

thanks very much.
04-13-2012, 08:01 PM   #4
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Step-rings are usually labeled as AA-BBmm where AA is the male thread (it screws into your lens) and BB is the female thread (your accessory screws into it). You'll want a 58-55mm step ring. Some front-mounted optical adapters come with sets of rings to accommodate various host lenses. So a screw-on adapter with 55mm rear thread may include step rings of 49-55mm, 52-55mm, 58-55mm, and 62-55mm. You may also find sets of step-up or step-down rings, usually pretty cheap as a set. I one ring costs US$4 and 7 rings cost US$10, guess which Ill buy?

04-14-2012, 03:47 AM   #5
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not sure which ring(s) you would buy, rio rico, ( which would it be ?) i would most always buy the 1 @ $4, as it seems i usually get what i pay for--- but sometimes not. the 58 to 55 i just bought, though, was $20.00.
04-14-2012, 04:39 AM   #6
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Try eBaying 'set of step down rings'. I've purchased from Digital Goja for instance with no problems on bits and pieces like this.

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