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08-10-2010, 03:54 PM   #61
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right,i had it in my hand.
it was a proto 1,4x,when i remember right with 5 lenses.
but no idea why its not in production

08-10-2010, 04:06 PM   #62
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What lenses?
08-10-2010, 04:07 PM   #63
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sorry.....lens elements
08-10-2010, 04:21 PM   #64
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QuoteOriginally posted by falconeye Quote
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 5m 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
Oh. Good!

I was worried about my soon-to-be-legacy-when-the-bottle-freezes APS-C glass ....

As facetious as that sounds, I think I'm serious.

08-10-2010, 06:10 PM   #65
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One thing nobody has mentioned. Yes, there are a few third-party TC's out there that work with SDM, but none out there work fully with SR. Sure 200mm worth of SR is better than nothing at 300mm, but 300 would be better. Besides, EXIF would then be correct as well.
08-10-2010, 07:17 PM   #66
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QuoteOriginally posted by Jodokast96 Quote
One thing nobody has mentioned. Yes, there are a few third-party TC's out there that work with SDM, but none out there work fully with SR. Sure 200mm worth of SR is better than nothing at 300mm, but 300 would be better. Besides, EXIF would then be correct as well.
Actually, this has been mentioned. Name a current production 3rd party TC, 1.4x or 2x that work with SDM.
08-10-2010, 10:50 PM   #67
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I know only that there is an old Tamronversion,but nothing more.
08-10-2010, 10:58 PM   #68
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Under 300 , 1.4x, WR (!!) - for FA 77, 50-135, 60-250, 200. Must be very high quality, because otherwise I could just as well crop. Should support both SDM and screw.

08-11-2010, 12:17 AM   #69
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Third party high quality that works with SDM: Kenko 1,5 PZAf

This is one of few converters which actually work and at the same time give you superb image quality. (On par with Pentax 1,7 Af or 1,4S.)

It also works with powerzoomlenses (of course) and is designed for FF.

But: Warning - this is also the only Kenko converter worth buying, all the rest is at their best mediocre, and the Kenko 2 PZaf does NOT work with SDM.

Sorry - unfortunately this converter is also not avaliable as new anymore (i think..)

Last edited by Ryhfeed; 08-11-2010 at 12:26 AM. Reason: Didnt read Blues post thoroughly
08-11-2010, 12:44 AM   #70
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1.4x, if it'll be an excellent pair for my 60-250. If I can get similar results by cropping, well...
08-11-2010, 02:33 AM   #71
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QuoteOriginally posted by Blue Quote
Actually, this has been mentioned. Name a current production 3rd party TC, 1.4x or 2x that work with SDM.
Sorry, I really wasn't referring to SDM at all. I was merely pointing out that, while there are a few limited choices for an SDM TC, there are none that compensate for SR.
08-11-2010, 03:05 AM   #72
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QuoteOriginally posted by Jodokast96 Quote
One thing nobody has mentioned. Yes, there are a few third-party TC's out there that work with SDM, but none out there work fully with SR. Sure 200mm worth of SR is better than nothing at 300mm, but 300 would be better. Besides, EXIF would then be correct as well.
And I think (I may be wrong) that the 1.7x converter does not pass any focal length at all (but it allows selection of proper resultant one on the body).
08-11-2010, 09:07 AM   #73
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QuoteOriginally posted by Ryhfeed Quote
Third party high quality that works with SDM: Kenko 1,5 PZAf

This is one of few converters which actually work and at the same time give you superb image quality. (On par with Pentax 1,7 Af or 1,4S.)

It also works with powerzoomlenses (of course) and is designed for FF.

But: Warning - this is also the only Kenko converter worth buying, all the rest is at their best mediocre, and the Kenko 2 PZaf does NOT work with SDM.

Sorry - unfortunately this converter is also not avaliable as new anymore (i think..)
I had 2 of the shq pz 1.5x tc's and while they would focus the lens, the focus would hunt and not lock reliably with the da300mm f4 I had. I think they dropped the new 1.4x because it wouldn't work right. (just a guess)
08-11-2010, 10:04 AM   #74
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QuoteOriginally posted by borno Quote
I had 2 of the shq pz 1.5x tc's and while they would focus the lens, the focus would hunt and not lock reliably with the da300mm f4 I had. I think they dropped the new 1.4x because it wouldn't work right. (just a guess)
Does that SHQ PZ 1.5x TC convert the f-stop and focal length? I suspect not, and I suspect that is why it hunts. My Tamron 1.4x TC does the same thing. It seems to overshoot when focusing, which I think is due to the camera expecting the focus to shift based on the non-converted focal length. If the TC converted the focal length, not only would that help the anti-shake system work better, it would also let the focus system move the focusing lens assembly the correct amount instead of moving it too far.

I find that if I stop focusing early (by letting go of the shutter), then redo the half-press to get it to focus again, I can get it to lock on focus much faster. It almost makes it useable.

The bottom line of all of this is that I certainly would be interested in a Pentax 1.4x TC that fully supported SDM. I would use it with my Sigma 70-200 f/2.8 to get (roughly) a 100-300 f/4 without having to lug around another monster lens .
08-11-2010, 12:44 PM   #75
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Since I do most of my shooting with a DA*300, a great quality 1.4X TC would fit the bill just nicely. As I cannot afford, and won't be for a long while, a 400/4 of any kind ( or longer), this would be a welcomed addition to my Pentax gear.
I have a Tamron 1.4X TC and I have used it very seldom ... I find that it just doesn't work quite well enough for me.
I'd be willing to pay $350 for a high quality SDM Pentax TC. But that's dreaming.

JP
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