JCO: >Did Pentax make a high performance >K mount 2X teleconvertor for long lenses? >I want one to try on my SMCK 1000mm >F8.
Pentax made a 2X-L converter dedicated to the longer A* series ED lenses. It works OK with these lenses. Otherwise, no non-dedicated 2X converter gives great results, and many of us, myself inculded, find that 2X converter never give good results. I never got acceptable result with the 2X-S converter. Getting sharp images with 1000mm lens without ED elements is almost impossible to start with. Getting good results with a 2X converter is impossible according to the laws of physics. It will also be impossible to get sharp images due to vibrations. You need at least two heavy duty tripods. At last, it is virtually impossible to focus an F:16 2000mm lens critically. So forget about it! P�l - 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 .
