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09-27-2011, 02:53 PM   #1
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How's the idea of using extension cubes for doing macro work on 50mm and 135mm prime?

I've been thinking of using extension cubes to do some macro shots with M50/2 and m42 135mm/2.8 lens. It will be occasional use. Need you inputs to see if it is the cheaper and right way to go for me.

Thanks,
Benhai

09-27-2011, 03:01 PM - 1 Like   #2
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Tubes are cheap, plentiful, and a whole lot of fun. Don't even debate it, just pick up a set. Since you're using them with m42 lenses, just get the really cheap ones without the auto aperture linkage. You can go on Ebay and get a set for about $6, and heck, at that price get two, since your 135mm will need more extension to get the same magnification.

Your other option is to get a reversal ring, and reverse your 50mm on the end of your 135mm. Also a lot of fun, short working distance, good magnification, and a bit less light loss than tubes.

RioRico wrote the book on this, for this forum anyway. Be sure to check out his wonderful breakdown of options here: https://www.pentaxforums.com/forums/pentax-lens-articles/152336-cheap-macro-b...lose-work.html
09-27-2011, 03:28 PM   #3
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Good advice! And RioRico's artcle is super nice!
I'll try the tubes first.
09-27-2011, 03:40 PM - 1 Like   #4
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Glad you like it! Yeah, what you'll want for what you have are:

* ultra-cheap PK macro tubes, about US$7 per set -- get 2 or 3 sets
* cheap and safe wide-flanged M42-PK adapter, for non-reversed M42's
* probably a cheap 49mm-PK mount-reversal ring, for working very close

Those will cost about US$30-35 on eBay, shipped. And they'll last forever.

Have fun!

09-27-2011, 03:55 PM   #5
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Hi RioRico:

* For PK macro tubes which one can toggle the aperture iris?
* m42 rings are safe to use.

Thank again!
09-27-2011, 04:07 PM   #6
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QuoteOriginally posted by benhai Quote
* For PK macro tubes which one can toggle the aperture iris?
Cheap PK tubes do not have an aperture linkage. That is not a real problem; the lens aperture will stay wherever you set it.

QuoteQuote:
* m42 rings are safe to use.
I recommend the 'safe' M42-PK adapter, with a wide flange. Such cannot jam on your camera. The narrow-flange adapters are 'unsafe' (or at least painful) unless you remove the screw and spring.

If you plan to buy more M42 lenses, then it's good to have a few sets of cheap M42 macro tubes. You can use that same 'safe' adapter to mount those tubes to your camera.
09-27-2011, 06:07 PM   #7
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Nice! Got it.
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