On Fri, Jul 13, 2012 at 01:48:33PM -0500, Darren Addy wrote: > That page misses one option (one that I only became aware of recently). > Tamron also made an Adaptall2 *Extension Tube* specifically for the SP > 90/2.5 that will get it to 1:1. > The obvious benefit to the tube is that you don't lose the two stops > of light that you would with the 01F teleconverter.
The laws of physics suggest you are mistaken here; if you spread the light energy out over a larger area it's not going to be as bright, no matter how that spreading is done. You'll lose a little bit of the light with an optical TC - nothing is 100% transparent - but to a first approximation the two ways of getting to 1:1 are equivalent. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
