Pentax SDM Converter,are you serious interested?

quarc · 08-08-2010, 09:56 PM

2x, 300-400 USD, DA 200, DA 300

1.4x wiold be of iterest too, but 2x more important with the focal lengths available now

purri · 08-08-2010, 10:11 PM

Originally posted by goubejp

A 1.4 x TC and the rumoured 400f4 to fit with; I hope...
There is too much image quality degradation with the 2X models (event with the 2XL)

In spades plus a 1.7x ! (perfect for surf work)

eurostar · 08-08-2010, 10:28 PM

I would buy the pair, 1,4x and 2x, but only if it is on par, quality wise, with the old manual L-converters for the A lenses, whatever the cost.

Of a converter of lesser quality, like the F-converter, I would have no use...

falconeye · 08-09-2010, 08:20 AM

Originally posted by zackspeed

My question is,how much may it cost,would you prefer the 1,4x or the 2,0x version?

1.4x or 1.5x. Competitively priced. A higher quality optical construction is preferred. A converter in a league with Tamron 1.4x Pz (which already supports SDM btw) should be $200 or below.

A better one could be more expensive. All depends on the resolving power of lens+converter. A converter resolving 5µm with a DA*300 (or a forthcoming longer lens) would be very valuable indeed.

Last but not least: A 1.4x/1.5x converter with outstanding quality retrofits all available APSC-only glass to full frame and its pure existance could fuel some more investments into DA glass

magnum1 · 08-09-2010, 08:27 AM

Originally posted by vagrant10

1.4 @ $275 50-135/ 60-250

Ditto

ewalk · 08-09-2010, 09:50 AM

Originally posted by falconeye

Last but not least: A 1.4x/1.5x converter with outstanding quality retrofits all available APSC-only glass to full frame and its pure existance could fuel some more investments into DA glass

Damnit it. Stop with these awesome ideas!

konraDarnok · 08-09-2010, 11:58 AM

I'd be interested in their same 1.7x F converter redone to use SDM instead of the screw drive.

northcoastgreg · 08-09-2010, 01:01 PM

I'd be willing to go as high as $400 for a 1.4x converter that matched the quality of the old 1.4x-L.

Spyder · 08-09-2010, 01:08 PM

If it's an either/or choice I'd prefer a 1.4x/1.5x, but obviously both that an a 2x would be better. Intended for use with longer glass (DA*300 and future longer lenses). Pricewise I'd say somewhere around the equivalent Sigma ones which should be enough for high quality ones.

**lmd91343** · 08-09-2010, 01:10 PM

I am buying two or three SDM lenses later this year.

I would be interested in a 1.4 tc.

CyberSammy · 08-09-2010, 02:24 PM

I think 1.7x would be fine when will be in good optical quality :-) it gives more range than 1.4x and better IQ then 2.0x :-) it also gives reasonable focal lengths with most of lenses :-) so I'm for the 1.7x :-)

philbaum · 08-09-2010, 09:57 PM

1.4x/$250/50-135, DA 300

rvannatta · 08-09-2010, 10:54 PM

I don't see the value in a 2x converter given the 'slow' telephotos now provided.
With the F2.8 300 mm telephoto the 2x converter makes sense, but I see it being used
only with the 300 F4 and you can't afford 2 fstops. You wind up too slow opticially to be useful, and if you destroy the image optically, then you have also destroyed the option of an optical crop.

Arpe · 08-10-2010, 02:56 PM

I consider it shameful that Pentax do not produce any SDM TCs. Surely they are one of the simplest things to produce, they already have the know-how from previous models.

Blue · 08-10-2010, 03:50 PM

Originally posted by Arpe

I consider it shameful that Pentax do not produce any SDM TCs. Surely they are one of the simplest things to produce, they already have the know-how from previous models.

They had a prototype of a DA series TC when the DA series lenses were first being announced and released. It was even on some lens road maps. After the Glass-Makers bought Pentax, it disappeared from the map. Just think. If kerr or Mason Jar bought Pentax, we could get our lenses from the cupboard and just use an adapter.

08-09-2010, 02:24 PM	#56
CyberSammy New Member Join Date: Mar 2010 Location: Nitra Posts: 4	I think 1.7x would be fine when will be in good optical quality :-) it gives more range than 1.4x and better IQ then 2.0x :-) it also gives reasonable focal lengths with most of lenses :-) so I'm for the 1.7x :-) Last edited by CyberSammy; 08-09-2010 at 04:40 PM.

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08-08-2010, 09:56 PM	#46
quarc Senior Member Join Date: Jan 2008 Location: Sweden Photos: Gallery Posts: 182	2x, 300-400 USD, DA 200, DA 300 1.4x wiold be of iterest too, but 2x more important with the focal lengths available now

08-08-2010, 10:11 PM	#47
purri New Member Join Date: Aug 2010 Location: Sydney OZ. Posts: 8	Originally posted by goubejp A 1.4 x TC and the rumoured 400f4 to fit with; I hope... There is too much image quality degradation with the 2X models (event with the 2XL) In spades plus a 1.7x ! (perfect for surf work)

08-08-2010, 10:28 PM	#48
eurostar Veteran Member Join Date: Dec 2006 Location: Albareto, Italy Photos: Gallery Posts: 819	I would buy the pair, 1,4x and 2x, but only if it is on par, quality wise, with the old manual L-converters for the A lenses, whatever the cost. Of a converter of lesser quality, like the F-converter, I would have no use...

08-09-2010, 08:20 AM	#49
falconeye Veteran Member Join Date: Jan 2008 Location: Munich, Alps, Germany Photos: Gallery Posts: 6,871	Originally posted by zackspeed My question is,how much may it cost,would you prefer the 1,4x or the 2,0x version? 1.4x or 1.5x. Competitively priced. A higher quality optical construction is preferred. A converter in a league with Tamron 1.4x Pz (which already supports SDM btw) should be $200 or below. A better one could be more expensive. All depends on the resolving power of lens+converter. A converter resolving 5µm with a DA*300 (or a forthcoming longer lens) would be very valuable indeed. Last but not least: A 1.4x/1.5x converter with outstanding quality retrofits all available APSC-only glass to full frame and its pure existance could fuel some more investments into DA glass

08-09-2010, 08:27 AM	#50
magnum1 Inactive Account Join Date: Oct 2007 Location: Niagara, Wisconsin U.S. of Ay. Posts: 394	Originally posted by vagrant10 1.4 @ $275 50-135/ 60-250 Ditto

08-09-2010, 09:50 AM	#51
ewalk Veteran Member Join Date: Sep 2008 Location: Texas Posts: 316	Originally posted by falconeye Last but not least: A 1.4x/1.5x converter with outstanding quality retrofits all available APSC-only glass to full frame and its pure existance could fuel some more investments into DA glass Damnit it. Stop with these awesome ideas!

08-09-2010, 11:58 AM	#52
konraDarnok Veteran Member Join Date: Aug 2007 Photos: Albums Posts: 969	I'd be interested in their same 1.7x F converter redone to use SDM instead of the screw drive.

08-09-2010, 01:01 PM	#53
northcoastgreg Pentaxian Join Date: Feb 2010 Location: Northern Michigan Photos: Gallery \| Albums Posts: 6,173	I'd be willing to go as high as $400 for a 1.4x converter that matched the quality of the old 1.4x-L.

08-09-2010, 01:08 PM	#54
Spyder Forum Member Join Date: Dec 2008 Location: West Sussex, UK Posts: 62	If it's an either/or choice I'd prefer a 1.4x/1.5x, but obviously both that an a 2x would be better. Intended for use with longer glass (DA*300 and future longer lenses). Pricewise I'd say somewhere around the equivalent Sigma ones which should be enough for high quality ones.

08-09-2010, 01:10 PM	#55
lmd91343 Site Supporter Join Date: Jul 2009 Location: Los Angeles, CA USA Photos: Gallery \| Albums Posts: 1,027	I am buying two or three SDM lenses later this year. I would be interested in a 1.4 tc.

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08-09-2010, 09:57 PM	#57
philbaum Veteran Member Join Date: Oct 2007 Location: Port Townsend, Washington State, USA Posts: 3,659	1.4x/$250/50-135, DA 300

08-09-2010, 10:54 PM	#58
rvannatta Pentaxian Join Date: Aug 2007 Location: Apiary, Oregon Photos: Gallery Posts: 1,181	I don't see the value in a 2x converter given the 'slow' telephotos now provided. With the F2.8 300 mm telephoto the 2x converter makes sense, but I see it being used only with the 300 F4 and you can't afford 2 fstops. You wind up too slow opticially to be useful, and if you destroy the image optically, then you have also destroyed the option of an optical crop.

08-10-2010, 02:56 PM	#59
Arpe Pentaxian Join Date: Sep 2006 Location: New Zealand Photos: Gallery \| Albums Posts: 4,452	I consider it shameful that Pentax do not produce any SDM TCs. Surely they are one of the simplest things to produce, they already have the know-how from previous models.

08-10-2010, 03:50 PM	#60
Blue Moderator Site Supporter Join Date: Jun 2008 Location: Florida Hill Country Photos: Gallery \| Albums Posts: 17,377	Originally posted by Arpe I consider it shameful that Pentax do not produce any SDM TCs. Surely they are one of the simplest things to produce, they already have the know-how from previous models. They had a prototype of a DA series TC when the DA series lenses were first being announced and released. It was even on some lens road maps. After the Glass-Makers bought Pentax, it disappeared from the map. Just think. If kerr or Mason Jar bought Pentax, we could get our lenses from the cupboard and just use an adapter.