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09-25-2013, 08:31 PM   #1
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Macro Photography

I recently bought a Pentax SMC f3.5 100mm macro lens. On the barrel it says that the closest it can get 1:2 on 35mm so what would the ration be on a Pentax K5.
Can anyone help.

09-25-2013, 08:38 PM   #2
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It will still be 1:2. You'll be the same distance away from the subject with a K5 or film. The K5 photo, compared to film, will appear to be more zoomed in because the APS-C sized sensor is smaller than film, but focusing distances don't change.scale
09-25-2013, 11:12 PM   #3
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QuoteOriginally posted by DeadJohn Quote
It will still be 1:2. You'll be the same distance away from the subject with a K5 or film. The K5 photo, compared to film, will appear to be more zoomed in because the APS-C sized sensor is smaller than film, but focusing distances don't change.scale
Thanks for that would a Pentax 100mm dental macro be 1:1.
To get to 1:1 I have to attach my Raynox 250 or tubes.
09-26-2013, 02:01 AM   #4
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The pentax A 100mm dental macro seems to be a version of the 100/4, which also only does 1:2.

You can of course use tubes to get it closer. Also, the dental version came with its own closeup filters. Those are probably very good.

09-26-2013, 02:55 AM   #5
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Didn't the Pentax 100/3.5 Macro come with a matched screw-on macro adapter that gave 1:1?
09-26-2013, 05:19 AM   #6
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You don't need 1:1, just crop. Pentax K7 / Pentax 100mm f4 Macro...........

Last edited by bluestringer; 09-28-2013 at 09:20 AM.
09-28-2013, 08:35 PM   #7
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I have bought a reversing ring so I can either put on my 28mm or 20mm. If I attach my 20mm to the front of the macro I can fill the viewfinder with a number on a ruler.
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