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05-05-2010, 05:21 PM   #31
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QuoteOriginally posted by SOldBear Quote
Nothing special. My FA-50 F/1.7 and F-28 F/2.8 each has a 49-28mm stepdown adapter ring. My DA70 and DA21 each has a 49-37mm and a 37-30.5mm stepdown adapter ring (I can't find 49-30.5mm adapter).

Also, my Tamron 90mm macro F/2.8 and Sigma 50mm macro F/2.8 each has a 55-37mm and a 37-30.5mm.

I like this kind of "lens hood." They are compact and IMHO protect the lens better than traditional hoods.
How did you arrive at these combinations, trial & error? Do you know that 49-28mm is optimum for a 50mm rather than some other size? What about caps, do you have to take the hood off to cap?

05-05-2010, 05:31 PM   #32
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QuoteOriginally posted by audiobomber Quote
How did you arrive at these combinations, trial & error? Do you know that 49-28mm is optimum for a 50mm rather than some other size? What about caps, do you have to take the hood off to cap?
Mainly trial and error.

I keep reducing the size of the opening until there is a change in vignetting, autofocusing or exposure settings.

The DA70 likely works with a 49-28mm adapter, but I'd like to keep the same size of lens caps (30.5mm) for all DA lenses. For the DA21, the 49-37mm ring has to be thin; even only 0.5mm thicker would cause vignetting.

For whatever reason, 49-30.5mm adapter doesn't exist, and 49-37mm adapter costs more than other sizes.

No need to take the hood off. I use caps of the same size as the opening. 30.5mm and 28mm caps are pretty cheap from FeaBay (you can see them in the second photo).

This kind of "hoods" doesn't work well with zoom lenses, except for maybe the DA* 60-250mm. I'm using a 67-55mm + 55-37mm for this lens.
05-06-2010, 04:45 AM   #33
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QuoteOriginally posted by Class A Quote
Thanks for the pointer!
Did you try it on a 50/1.4? I presume vignetting is not a problem?
Unfortunately, the product page doesn't specify the dimensions.
Of course, and vignetting is no problem. You may even use the Takumar-era metal lens hood for the Takumar 135mm F3.5 on a 50mm on APS-C.
06-24-2010, 11:19 PM   #34
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Good. It is very useful for me.


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