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Tamron 90 macro + Pentax 1.7 TC · 10:45 AM

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

daacon · 06-03-2012, 01:33 PM

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 ?

normhead · 06-03-2012, 01:39 PM

Quote:

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.

**MSL** · 06-03-2012, 08:20 PM

Originally posted by normhead

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.

leptim · 06-03-2012, 08:36 PM

Nice shots...looks like a pretty good setup

**Bruce Clark** · 06-04-2012, 01:16 AM

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

normhead · 06-04-2012, 05:42 AM

Quote:

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.

Quote:

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.

**MSL** · 06-04-2012, 06:01 AM

Originally posted by normhead

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.

normhead
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06-03-2012, 01:33 PM	#2
daacon Veteran Member Join Date: Mar 2007 Location: Alberta,Canada Photos: Gallery Posts: 20,914	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
normhead Pentaxian Join Date: Jun 2007 Location: Near Algonquin Park Photos: Gallery \| Albums Posts: 40,451 Original Poster	Quote: 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
MSL Site Supporter Join Date: Feb 2012 Location: Greater Toronto Area Photos: Gallery \| Albums Posts: 4,756	Originally posted by normhead 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
leptim Veteran Member Join Date: Mar 2012 Location: Fountain, CO Photos: Albums Posts: 611	Nice shots...looks like a pretty good setup

06-04-2012, 01:16 AM	#6
Bruce Clark Loyal Site Supporter Join Date: Mar 2010 Location: Ocean Grove, Victoria Photos: Gallery \| Albums Posts: 4,458	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
normhead Pentaxian Join Date: Jun 2007 Location: Near Algonquin Park Photos: Gallery \| Albums Posts: 40,451 Original Poster	Quote: 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. Quote: 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
MSL Site Supporter Join Date: Feb 2012 Location: Greater Toronto Area Photos: Gallery \| Albums Posts: 4,756	Originally posted by normhead 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.

Macro Tamron 90 macro + Pentax 1.7 TC

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