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07-16-2007, 04:10 AM   #1
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Tele converters for Pentax lenses

I am suddenly thinking of tele converters which I think might help in the following ways:

1) Use it in conjunction with the 50/f1.4 so that a 2X can turn it into a 100/f2.8!!

2) Use it in conjunction with the 50-200/f4-5.6 so that a 1.4X can turn it into a 70-280mm/f5-7

What do you guys think?

Do you guys use tele converters at all?

07-16-2007, 05:12 AM   #2
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I'm beginning to experiment with my old Tokina RMC Doubler from my film days on my K10D. I'm liking it but I asked some questions in this thread
but so far no replys. I've tried it with my Sigma 70-300, turning it into a 600mm and the pictures were pretty good but man, camera shake is an issue even on a tripod because this lens has no tripod collar.
07-16-2007, 05:18 AM   #3
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Original Poster
I am surprised that camera shake is an issue with the relatively good SR of the K10D!

So I guess it is perhaps better to just get a good zoom lens rather than playing around with a tele-converter.

The problem with a good zoom lens is its cost.
07-16-2007, 10:10 AM   #4
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Camera holder

I've created a simple holder on which I attach my camera and that has a support for the lens.
The tripod connection is more or less in the centre of gravity of the whole thing, so I have considerably less camera shake.

07-16-2007, 03:29 PM   #5
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i've never been happy with converters on a zoom lens. there's just too much glass in the way. if you are going to use them on a zoom , i'd suggest not going higher than 1.4x. just my 2¢
07-17-2007, 09:54 AM   #6
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Personally I've only (almost) used converters on longer prime lenses like my 300 mm and then I got mostly good results with the matching 1.4. With the matching 2.0 the results were not as good but passable. Nowadays the 2.0 stay is the bag unless I have to have a longer reach. I once tried the 1.4 on my telephoto zoom and the results were not satisfying.

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