Best Tele-Converter for use with Pentax 100mm Macro Lens


Photon

Link Posted 25/05/2012 - 01:49
I want to improve my insect photography capability. Which is the best tele-converter for use with the Pentax 100mm Macro Lens, from both past and present production tele-converters. I recently purchased a 'ASAHI OPT..TAKUMAR-A 2X TELE-CONVERTER' from 'e-bay' but I have been disappointed in the resultant images! They lack that crispness that I expect from my Pentax 100 mm Macro lens! As can be seen from my recent spider image added to the gallery on 25 May 2012.

Regards Photon
All five minute jobs take a minimum of eight hours!
Last Edited by Photon on 25/05/2012 - 02:08

K10D

Link Posted 25/05/2012 - 02:38
Most 2x TC's will knock the edge off IQ. A 1.4x TC or the Pentax 1.7x AF works much better.

Best regards

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gartmore

Link Posted 25/05/2012 - 07:27
Tele converters are best avoided with a few exception. Pentax sold some Takumar branded low end lenses for a while, best avoided too.
Ken
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -

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milamber

Link Posted 25/05/2012 - 07:58
Adding some cheap extension tubes will increase magnification with the M 100mm macro and you shouldn't see any loss of quality. It will increase the length of the lens, but no more so than a teleconverter would have.

I have a Macro teleconverter I use with manual lenses and I would be hard pushed to see any loss of quality when I use it. That said if I used it as a 'proper' teleconverter to double focal length it's useless. Perhaps the same is true of a normal teleconverter, but in reverse ie. o.k. for distance, hopeless for macro?

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ChrisR

Link Posted 25/05/2012 - 09:04
Photon wrote:
I want to improve my insect photography capability. Which is the best tele-converter for use with the Pentax 100mm Macro Lens, from both past and present production tele-converters. I recently purchased a 'ASAHI OPT..TAKUMAR-A 2X TELE-CONVERTER' from 'e-bay' but I have been disappointed in the resultant images! They lack that crispness that I expect from my Pentax 100 mm Macro lens! As can be seen from my recent spider image added to the gallery on 25 May 2012.

Regards Photon

Colin.

Don’t beat yourself up over your spider image, its better image quality than I have obtained using the, Pentax 100mm 2.8 WR macro lens, straight on a K5.

Also you did get it to work.

I tried a Vivitar x3 converter on my K5, with the Pentax 100mm macro, the camera just locked up and would not do anything, just displayed an error, can’t now remember what the error was, but it did scare the hell out of me at the time, as I thought I my have damaged the camera, but all was well after removing the converter.
Just mentioned this, as maybe, Vivitar converters are not compatible ?. It was manual.

Take care.
Chris R.

I. El. (Eng). (Rtd).

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Charlotte

Link Posted 25/05/2012 - 09:05
Aparently the Pentax 1.7 works really well with this lens.

I've been using mine with tubes and haven't tried with a teleconverter. I have old vivitar ones that worked really well with my sigma and vivitar macro lenses without any noticeable loss in image quality.

If you like I'll have a try with it later and see what the result is.

One thing - did you use a tripod to take that picture ? Obviously the greater the magnification the more any tiny movement of the lens or creature is magnified as well.

Kind regards
Charlotte
Pentax Photo Gallery
Photography blog

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Mike-P

Link Posted 25/05/2012 - 09:34
Pentax 1.7x converter is a superb match with the 100mm macro. Mine is attached 90% of the time.



Spider by Mike.Pursey, on Flickr



Dragonfly by Mike.Pursey, on Flickr



Spider having lunch by Mike.Pursey, on Flickr



Caterpillars by Mike.Pursey, on Flickr
. My Flickr

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K10D

Link Posted 25/05/2012 - 10:07
Great shots (examples) there Mr Pursey.

Best regards
Last Edited by K10D on 25/05/2012 - 10:08

DrOrloff

Link Posted 25/05/2012 - 10:08
Some flies with the DFA100 and f1.7:











For wildlife work a bag with the the 100macro, 300 and the f1.7 gives a lot of coverage.
You can see some of my photos here if you are so inclined
Last Edited by DrOrloff on 25/05/2012 - 10:08

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darkskies

Link Posted 25/05/2012 - 10:31
Teleconverter is better for macro than tubes or not? Or would you say the teleconverter is more versatile, being able to use it for other stuff?
This space deliberately left blank.

johnwhit

Link Posted 25/05/2012 - 11:13
DrOrloff wrote:

For wildlife work a bag with the the 100macro, 300 and the f1.7 gives a lot of coverage.

I'd agree here, I generally carry a Tamron Di 90/2.8, Pentax DA*300/4 with Tamron-F AF1.4x Pz-AF MC4 and Teleplus 1.5x Pz-AF SHQ, Teleplus Pz-AF 1.7x SHQ allowing various set-ups. All the TC's work well with the Tamron Di 90 Macro.

John
PPG link

In LBA hiatus.
Last Edited by johnwhit on 25/05/2012 - 11:20

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gartmore

Link Posted 25/05/2012 - 11:17
Dont confuse teleconverters with extension tubes, they do different things. An extension tube allows you to get closer, a TC allows you to be further away
Ken
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -

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gartmore

Link Posted 25/05/2012 - 11:19
@ Mike-P & DrOrloff, great pictures - I've gone off the idea of making lunch!
Ken
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -

Charlotte

Link Posted 25/05/2012 - 11:24
With old vivitar 2 x converter - just taken, lens at full magnification, camera held by one hand as it's so windy I had to hold the plant still with the other.

Excuse dust spots - I can't be bothered to work on them and exposure is probably off but I didn't want to waste time sorting out lighting.










One taken with tubes the other day for IQ comparison;



Pentax Photo Gallery
Photography blog

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Mike-P

Link Posted 25/05/2012 - 11:28
ROTFL.

It takes me about a day to find one ruddy fly and you go outside and get those in a just over an hour.

Excellent shots Charlotte ...

DrOrloff : very nice .. I really should do something to diffuse my lighting more.
. My Flickr
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