any info?

gokenin · 12-03-2007, 08:23 PM

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I know that with a teleconverter that you loss at least one fstop on your lens and I was wondering if anyone has ever seen or used this eBay Express: 2X TELEPHOTO Lens for your Pentax and 50-200mm Lens - Description
would almost turm my 50-200 into an almost equal to the little bigma?

Peter Zack · 12-03-2007, 08:37 PM

I haven't used one of these but I can pretty much guarantee that you'd be disappointed. I would suggest you'll get vignetting from this attachment, at least in the wider range and dramatically lower image quality with a loss in speed. There could easily be an effect in AF performance as well and issues with flare, contrast and reflections in bright light situations.

There are, unfortunately, no magic cheap fixes for good long glass.

It would be interesting to hear from anyone that has tried one of these.

12-03-2007, 08:23 PM	#1
gokenin Veteran Member Join Date: Oct 2007 Location: lowell,ma Posts: 1,899	any info? Staff note: This post may contain affiliate links, which means Pentax Forums may earn a small commission if a visitor clicks through and makes a purchase. If you would like to support the forum directly, you may also make a donation here. I know that with a teleconverter that you loss at least one fstop on your lens and I was wondering if anyone has ever seen or used this eBay Express: 2X TELEPHOTO Lens for your Pentax and 50-200mm Lens - Description would almost turm my 50-200 into an almost equal to the little bigma?

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12-03-2007, 08:37 PM	#2
Peter Zack Pentaxian Moderator Emeritus Join Date: May 2007 Location: Edmonton Alberta, Canada Photos: Gallery \| Albums Posts: 10,643	I haven't used one of these but I can pretty much guarantee that you'd be disappointed. I would suggest you'll get vignetting from this attachment, at least in the wider range and dramatically lower image quality with a loss in speed. There could easily be an effect in AF performance as well and issues with flare, contrast and reflections in bright light situations. There are, unfortunately, no magic cheap fixes for good long glass. It would be interesting to hear from anyone that has tried one of these.

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