Adam Maas wrote: >On Sat, Mar 6, 2010 at 2:01 PM, Mark Roberts <m...@robertstech.com> wrote: >> Adam Maas wrote: >> >>>The adapters on eBay are optical, in that they're an extension tube >>>with a cheap optic inside to restore infinity focus, but function like >>>a teleconverter (about a 1.2x increase in focal length, 2/3rds of a >>>stop in light loss and a massive impact on image quality). They purely >>>add suck to your images. >>> >>>I really wish that you could practically adapt Pentax lenses to A >>>mount. My Maxxum 7 would see much more use. >> >> In researching my possible purchase of a Sony A850 I looked into those >> adapters and came to the same conclusion. But I'm interested in seeing >> if the optical element can be removed to create an adapter/extension >> tube for macro work. > >Yes, some application of a dremel will result in a usable, if short, >extension tube that also converts mounts.
Might not take that much work. I once had an ancient Sigma 2x teleconverter in which the optical elements could easily be unscrewed to create an extension tube. No idea if they planned it that way. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
