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11-27-2011, 09:15 AM   #1
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DA* 300 lens w/tc

Has anyone had any experience using a tc with the DA 300 lens? Any recommendations?Thanks.

11-27-2011, 10:01 AM   #2
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Paired to a K-5, you need lots and lots of light and hold it very very steady...

Cheers...
11-27-2011, 10:09 AM   #3
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It works great with the AFA 1.7x. Actually it is no slower than a Sigma 50-500mm and the IQ is as good with the converter. It will also work with the Tamron PZAF 1.4x mc4 and the Kenko PZAF shq 1.5x. It will focus in decent light but will hunt and you have to give about 3 button half presses to get it to focus lock. Most other converters will work but only with manual focus. I was happy enough with the results with these converters that I sold my Sigma 50-500mm. All of these converters you will probably have to find on the used market. The AFA 1.7x is the most expensive at around $400. It was originally meant to be used with manual lenses to make them auto focus. It requires the user to manually get the focus close then the half press makes the elements inside the converter move to lock focus. It works great and the IQ is about the best you can ask for using a teleconverter with that lens.

regards.
11-27-2011, 10:22 AM   #4
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I used the Tamron 1.4x Pz for a little while but it was often struggling to AF and I found cropping w/o the TC was usually as good as using the TC. Next up was the Pentax 1.7x AF and when you have decent light, it provides enough range to beat cropping while preserving detail. That combo is my typical BIF setup. A little learning curve to remember to manually change the focus if outside the limited range of the TC but its way lighter than a Bigma....tried that too.
Not sure about the QC? Here is a recent BIF with the da*300 + 1.7xAF, wide-open at f6.7.

Now you only have to find this magnificent TC.

EDIT: Forgot to mention using the 1.7xAF in AF.C mode works pretty well as in this shot.



Last edited by imtheguy; 11-27-2011 at 11:30 AM.
11-27-2011, 11:19 AM   #5
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QuoteOriginally posted by GaryH Quote
The AFA 1.7x is the most expensive at around $400. It was originally meant to be used with manual lenses to make them auto focus. It requires the user to manually get the focus close then the half press makes the elements inside the converter move to lock focus.
I'm curious: Is the AFA 1.7x faster to use than CIF?
11-27-2011, 03:04 PM   #6
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teleconvertors

Thanks for the insight
11-27-2011, 04:24 PM   #7
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I use mine with a Pentax AF 1.7 adapter and I am very pleased with the results. Focus is fast but you must prefocus by hand in the first place.
11-28-2011, 05:16 AM   #8
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QuoteOriginally posted by RioRico Quote
I'm curious: Is the AFA 1.7x faster to use than CIF?
I find that there is a learning curve to master with the AFA. You have to get the focus close enough for the TC to take over. When it does focus it is very fast. The elements only travel a few mm so there is no long focus throw like on a actual lens. I have tried CIF some lately and find that as long as the area around your target is clear, you have no issues. But if your target is going through the trees, you might just get a nice clear shot of a branch. CIF is a rather novel approach to getting moving subjects in focus and I am planning to try and master it also.

regards

11-28-2011, 11:38 AM   #9
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QuoteOriginally posted by GaryH Quote
I find that there is a learning curve to master with the AFA. You have to get the focus close enough for the TC to take over. When it does focus it is very fast. The elements only travel a few mm so there is no long focus throw like on a actual lens. I have tried CIF some lately and find that as long as the area around your target is clear, you have no issues. But if your target is going through the trees, you might just get a nice clear shot of a branch. CIF is a rather novel approach to getting moving subjects in focus and I am planning to try and master it also.
No, CIF isn't good in cluttered nor bland subject fields, nor with low light nor tight apertures, nor when timing is important. AF may be problematic there too. Every photo is a problem to be solved, and that may include trade-offs of sharpness vs composition vs time. Ah well, there's always spray-n-pray, eh?
11-29-2011, 08:31 PM   #10
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I have become a big supporter of teleconverters. I have read also that the Canikon bunch also have their issues with teleconverters and issues are not just a Pentax thing. I now have a Tamron 400mm f4 and am using teleconverters with it with very decent results. For me and my budget, the teleconverters allow me to use focal lengths that I could not otherwise afford with decent results.
11-30-2011, 04:12 AM   #11
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The Tamron 1.4x Pz or the Kenko 1.5x Pz work well if you turn off the lens autofocus motor and use 'catch in focus'. I used this combination for quite a while as my 'long lens' and though I now have the Sigma 500 f4.5, I still use the DA*300 and a TC when I have to carry the lens long distances (like multi-day hikes) or when travelling space is tight.
11-30-2011, 06:41 AM   #12
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although not the DA 300/4, I use the SMC-F 1.7x AF TC with my K300/4 and get good results.

the shot below is arguably my best with this pair

shot with my *istD and a flash



the DA 300/4 will be better than this, if used correctly
12-03-2011, 03:59 PM   #13
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Am I missing something? Won't the aperture be stuck on f22?
12-04-2011, 07:03 AM   #14
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QuoteOriginally posted by Michaelina2 Quote
Paired to a K-5, you need lots and lots of light and hold it very very steady...

Cheers...
Did you hear of tripods yet?

The DA 300 is a nice lens, but somebody at Pentax forgot to design a TC with it. The DA 200, 50-135 could even do with a 2x TC, those two plus the DA 300 and the 60-250 should AF with a 1.4 TC. The K5 required f/5.6 or beter for AF. TCs are typically designed to go along with wide open 300/400/600 mm lenses, but these are absent from the Pentax portfolio for quite some time without replacement.

Last edited by zapp; 12-04-2011 at 07:12 AM.
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