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10-07-2009, 06:32 AM   #1
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50mm vs 35-70 zoom for macro

I bought cheaply a nice Pentax 35-70 k/a "micro" lens which while producing nice crisp images is of course not a true 1:1 macro lens.
I have bought a reversing ring and by removing the lenses from a damaged teleconverter made an extension tube. Now both work well for macro/ micro
with the reverse ring and tube but my question is would a prime 50 mm either 1.7 or 2.8 which seem to be plenty full and cheap using the above kit be any better than holding the 30-70 at 50mm?
Alistair

10-07-2009, 08:28 AM   #2
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Well, even on an extension tube there is no need to hold the 35-70 at 50 - you can use it at any focal length. Zooming will chane the magnification, and thus the focus, but you can refocus and get more magnification at 35mm, or less at 70. I have never tried a zoom on a reversing fing, but I do suspect a prime lens would be better suited for that.
10-07-2009, 08:45 AM   #3
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If you want to use a reversing ring, a prime is much easier to use. But that doesn't mean that it's EASY. It's actually very hard to operate a reversed lens. The live view on my K20D is incredibly useful for this, but it's still really much more complicated than using a true macro lens.
10-08-2009, 05:30 AM   #4
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Original Poster
OK I have a feeling I am getting this all wrong, it is not so important to physically get close to the object [example a spider]as to be able to get a full frame of it or as close as possible, so does that mean I need to get close physically by using a specific lens and reversing ring or tube or should I be looking at a 100mm lens with a macro filter, or extension tube or whatever to be able to get further away? Is a 28mm wide angle lens reversed not better than a 50mm reversed if I need t get physically close to achieve this?
perhaps I should start a new thread, this is now going off the original question somewhat?
Alistair

10-08-2009, 06:17 AM   #5
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A 50 mm reversed will give you about 1:1 enlargment, a 28 mm reversed will give you about 2:1, double the enlargment.

I played with a reversed 28 mm, it's impressive how huge you can enlarge things, but DOF gets absurdly thin and focus is horribly hard.
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