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05-08-2010, 01:27 PM   #1
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Close-up lens

Wondering what the groups thoughts were on close-up lenses? Are they better for the occassional documentation of serial numbers and the like? Or are they adequate for serious close experimentation? Should I just look for a 120 macro?

05-08-2010, 01:31 PM   #2
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I tried a generic-name one that had come with some lens or another... the results were poor. This isn't to say a real good one wouldn't be better... the macro lens has a good rep, or else you might try the extension tubes - they work well.
05-08-2010, 02:05 PM   #3
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Thanks Nesster. I was thinking about a Pentax brand one, but I think I'll look for their extension tubes instead. Now I'll only lose the auto focus funtion on my 645NII, but will still have AF confirmation, correct?
05-08-2010, 02:46 PM   #4
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Simple close-up lenses will compromise IQ. Compound achromatic lenses are made by Canon, Olympus, Marumi, Sigma and Raynox and all of these can give you good quality photos, auto aperture and AF (not that AF is terribly useful for macro). Have a look at the Raynox samples in this thread; https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/74221-raynox-macro-club.html.

05-08-2010, 04:06 PM   #5
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You need achromatic close up lens for the best results:

Currently Available 2 Element (Achromatic) Close-up Lenses

You might have difficulty finding them though.

Warren
05-08-2010, 04:48 PM   #6
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Much appreciated folks!
05-08-2010, 07:03 PM   #7
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QuoteOriginally posted by wkkato Quote
You need achromatic close up lens for the best results:

Currently Available 2 Element (Achromatic) Close-up Lenses

You might have difficulty finding them though.

Warren
Odd they don't show the Raynox achromatic lenses (DCR-150 and DCR-250). They're readily available.
05-08-2010, 07:14 PM   #8
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Fuzzcraft.com | A list of achromatic close-up lenses | Photography, audio and light DIY projects
then

05-10-2010, 04:56 AM   #9
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I have one from Nikon (the 6T I guess) that was not cheap at all (and I guess it is not produced anymore) in 62 mm size. I tested it with Minolta AF 100/2.8 macro and could not see any image degradation (OK, it was with 6 Mpix APSC DSLR). On a non-zoom lens the resulting focus range was rather limited (well, it is a rather strong one), but was very nice to use with 70-210/4 zoom.

Just a side notice - depending on the close-up lens and the lens you want to mount it on - check whether the glass elements do not tend to get in contact when you screw the close-up lens too deep. It could yield a very non elegant coating damage. Just put a little piece of paper cleaning tissue on the lens when you test for the first time to be on the safe side.
06-01-2010, 02:48 AM   #10
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I guess B+W is nice. My friend tried one B+W one on his Sony A850 and view it at 100% and can't find the image has degraded...
06-01-2010, 03:35 AM   #11
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I sometimes use a Canon achromat on my Voigtlander 180/4, as this a close-up lens. With the achromat in place it becomes a real macro lens and I cannot see any degradation. A good achromat is a convenient way for high quality macros or close-ups, as it takes up next to no room in the bag and keeps all the technical properties of the lens (AF, P-TTL etc.)

Ben
06-01-2010, 03:59 PM   #12
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QuoteOriginally posted by Ben_Edict Quote
I sometimes use a Canon achromat on my Voigtlander 180/4, as this a close-up lens. With the achromat in place it becomes a real macro lens and I cannot see any degradation. A good achromat is a convenient way for high quality macros or close-ups, as it takes up next to no room in the bag and keeps all the technical properties of the lens (AF, P-TTL etc.)

Ben
Thanks for the tip. I have a good achromat (82mm dia) for my video 35mm adaptor and knew it was for close up focusing on the adaptor matte but never though about putting on my still camera.
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