On Sun, 4 Nov 2001 10:48:20 -0000, Frits J. Wthrich wrote: >How are Tamron teleconverters compared to Pentax? I see there are Tamron >1.4x AF teleconverters for much less then the Pentax 1.4x-L. Is there a big >difference in quality? I am thinking of using it between my SMC-A 400mm >f/5.6 and my PZ-1.
Hi Frits, I am not sure about this Tamron, but I have a similar 1.4 AF converter made by Sigma. I also have the 1.4x L converter and the big difference is that the Sigma does cause some vignetting when used with big glass like the 300mm f/2.8. The Pentax L does not. (I have the 1.4x and 2x AF EX Sigma converters, but hardly use them) This is caused mainly by the 'snout' the L converters have, that goes inside the lens, and because the aperture of the converter-lens is a bit bigger. It should be OK on the 5.6 400mm I guess ... Regards, Jan van Wijk --------------------------------------------------------- Jan van Wijk; www.fsys.demon.nl - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
