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05-15-2012, 10:41 AM   #1
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Closeups

Hi

I have my new 135mm f3.5, which is a great lens, although the minimum focusing distance is pretty poor… Can anyone suggest anything to bring the focusing distance in?

I have thought about bellows, but I'm completely lost into which one I should consider...

Thanks for your help

05-15-2012, 10:47 AM   #2
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Which version of the 135? The M or the K?

A Raynox would probably be your best solution.

DCR-150 Macro conversion lens for D-SLR camera

The provided adapter is fine for the K, but if you have the M you can just get a 49 to 43 step-down ring.
05-15-2012, 10:53 AM   #3
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Another option, which may get you better edge definition, would be extension tubes.
If you don't want to trawl the online auction sites,
and don't mind pre-setting the aperture after focusing,
you can buy new manual tubes for GBP 17.50 from SRB Griturn:

Manual extension tubes
05-15-2012, 11:03 AM   #4
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Pentax made close-up adapters in 49, 52 and 58mm sizes. They were marked S-xx for standard lenses and T-xx for telephotos. There was one that was designed for the M or K 135/3.5. (T-80 or T-160)

Here is a link for the K series manual:

http://c758710.r10.cf2.rackcdn.com/files/support/manual/270_1314744956-1379434212_manual.pdf



Phil.

05-15-2012, 12:16 PM   #5
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Raynox 150 should give around 1:1 magnification with a 135. Doubt you can beat it for the price or for the size
05-15-2012, 12:19 PM   #6
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See: https://www.pentaxforums.com/forums/pentax-lens-articles/152336-cheap-macro-b...lose-work.html

Your options vary depending on your budget and how close you want to go. A Raynox on your 135 goes nicely. M = F*D/1000 where M is magnification, F is host lens focal length, and D is dioptre of the add-on lens. Raynox DCR-150 is +4.8dpt; the DCR-250 is +8dpt. So magnification with your lens (at infinity focus) would be:

DCR-150: 135*4.8/1000= ~0.65x
DCR-250: 135*8.0/1000= ~1.1x

Extension tubes would be a little cleaner optically, but at the cost of losing aperture control and light. Tubes eat light and close-up adapters don't. Also, adapters don't cripple the lens in any way. Tubes are cheaper than Raynoxi, but adapters are much easier to use.
05-15-2012, 12:56 PM   #7
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You can combine both: extension tubes and Raynox together.

http://www.pbase.com/piotreks/macro_setup

Extension tube is simple way to have close-up using standard lens like A50/1.2

05-15-2012, 01:53 PM   #8
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QuoteOriginally posted by RioRico Quote
Raynox DCR-150 is +4.8dpt; the DCR-250 is +8dpt. So magnification with your lens (at infinity focus) would be:

DCR-150: 135*4.8/1000= ~0.65x
DCR-250: 135*8.0/1000= ~1.1x
But it must be emphasized that this is, as stated, *at infinity focus*. By emprical measurement (eg, shooting a picture of a ruler), I can tell you magnification at *minimum* focus distance is right around 1:1 (1x) with the Raynox 150 on the M135/3.5. So it's really a rather nice option, giving you a range of magnifications from 0.65x (1:1.5 if I am doing the math right) to 1x (1:1). Whereas the 250 would start at 1:1 and go up from there. Sounds nice, amd if your main interest is small insects that are not currently moving, that might be what you want, but really, for a lot of maco photography, it,s that range between 1:2 and 1:1 you'll get a lot of mileage out of, and the greater working distance of the 150 is nice for insects (you can always crop to get more apparent magnification).

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