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04-05-2011, 08:54 AM   #1
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Raynox macro converter on 50mm lens?

Quick question, can't seem to find the answer. I see lots of people recommend the raynox converters for 50mm prime lenses. I have a Pentax-A 50mm 1.7. The front thread mounts are 49mm. The info for the converter says Universal lens adaptor Fit 52mm 55mm 58mm 62mm 67mm Lens caps. My question is wheather I can use this adapter or not with this lens. Thanks

04-05-2011, 09:05 AM   #2
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The back thread is 43mm. You can just get a 49mm to 43mm stepdown ring, mount it to the lens instead of the universal adapter, and screw it into the camera.
04-05-2011, 10:13 AM   #3
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As Wasser intimated, the spring-clips of the Raynox (universal adapter) won't squeeze down all the way to fit inside a 49mm filter thread. Another alternative is to get a step-up ring 49mm to any size within the Raynox specs. Ex. 49mm to 52mm set-up ring.

This will let you keep the universal adapter flexibility of taking the Raynox on-and-off quickly depending on your desire to shoot with or without it.

-w
04-05-2011, 12:42 PM   #4
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Actually, the universal clip-on WILL fit onto 49mm threads. But it's real tight, and requires a bit more force than some folks are comfortable with. I'll put it this way: I've done it, and I'll probably do it again, but a step ring is probably a 'better' approach. I keep both 49-43 and 49-52 step rings in my Raynox kit-baglet, along with the included rings... and a set of 49mm close-up meniscus lenses, and a 42-43 step ring.

Huh? Why those? Well, because sometimes I just want less magnification than my DCR-250's +8 dioptres provides. And because the +1 dioptre will dramatically thin-out DOF for portraits etc. And because the adjacent kit-baglet contains a little M42 Macrobel bellows. Mount the bellows on the camera (with flanged M42-PK ring), the Raynox on the bellows (with 42-43mm ring), and a close-up meniscus on the Raynox, and I've got a 100/3.5 'character' lens, great for giving a 'period' look to images. That's my excuse, anyway.

04-05-2011, 12:46 PM   #5
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Thanks for the info. I agree, the step up ring sounds like the best option here.
04-05-2011, 04:50 PM   #6
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..or just get a step-down ring to the size of the Raynox lens (minus the adapter..I don't have the lens with me now so I can't remember the filter size) and just screw the main lens to the step down converter and it will also be exactly centered on the 50mm lens.
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