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Tamron 90 macro + Pentax 1.7 TC
Lens: Tamron 90 2.8 macro + Pentax 1.7 TC Camera: K-5 Photo Location: Whitney On, Canada ISO: 800 
Posted By: normhead, 06-03-2012, 10:45 AM

Just fooling around. Curiosity from one of the forum threads got me off my butt and out shooting with this combination.














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06-03-2012, 01:33 PM   #2
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It's an unorthodox combination for sure would never think to put the TC on a macro lens - results are good though - do you see any advantages ?
06-03-2012, 01:39 PM   #3
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QuoteQuote:
It's an unorthodox combination for sure would never think to put the TC on a macro lens - results are good though - do you see any advantages ?
More magnification would be the obvious one.
06-03-2012, 08:20 PM   #4
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QuoteOriginally posted by normhead Quote
More magnification would be the obvious one.
I'm assuming you are using a TC that gives you full coupling with the lens? Otherwise, I wonder if you could achieve similar results using extension tubes.
Of the photos, I think the second last one of the blue flowers is a real standout.

06-03-2012, 08:36 PM   #5
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Nice shots...looks like a pretty good setup
06-04-2012, 01:16 AM   #6
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Interesting effects the shallow DoF has on the insects. I agree with MSL, the blue flower is a winner.
06-04-2012, 05:42 AM   #7
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QuoteQuote:
I'm assuming you are using a TC that gives you full coupling with the lens? Otherwise, I wonder if you could achieve similar results using extension tubes.
I have no idea what the difference would be between extension tubes and a 1.7x converter. Do extension tubes allow auto-focus? That might be one. Someone claimed the converter reduces resolution. However then you have to ask.. does every element in a 13 element lens reduce resolution? And how is the glass in a 1.7 converter different from the other elements in a lens? In any case, I've only got questions, no answers.

QuoteQuote:
Interesting effects the shallow DoF has on the insects. I agree with MSL, the blue flower is a winner.
Thanks Bruce.

A link to the forum review.

https://www.pentaxforums.com/lensreviews/Pentax-Rear-Teleconverter-F-1.7x-Autofocus-Adapter.html

Last edited by normhead; 06-04-2012 at 05:48 AM.
06-04-2012, 06:01 AM   #8
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QuoteOriginally posted by normhead Quote
I have no idea what the difference would be between extension tubes and a 1.7x converter. Do extension tubes allow auto-focus? That might be one. Someone claimed the converter reduces resolution. However then you have to ask.. does every element in a 13 element lens reduce resolution? And how is the glass in a 1.7 converter different from the other elements in a lens? In any case, I've only got questions, no answers.
If your TC allows for autofocusing it does far more than even the A style extension tubes would allow. So it is a much better option, and the rest of your questions don't matter too much - the answers are in the images which are sharp enough.

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