ann sanfedele wrote: > notice how I cleverly avoided mentioning my little bastard camera... > > but seriously, folks - It took me a few beats too long to realize that a > 28mm smc Pentax lens on a > 35 mm digital camera changes it to a less wide lens -- and, I'm > guessing, the bit of space between the > back of the lens and the camera itself, due to the thickness of the > adaptor also contributes to this. > > Soooo is there a chart somewhere or a formula that says 28 becomes > 50(?) etc ??? > Does the difference/ proportion increase with the physical length of the > lens? > > My 100mm macro seems like a 200 mm lens - so I'm really in pig heaven.... > > It seems like the 28 mm still has the same depth of field given any > given aperature when it is > on the KX or the digital camera.... > > ann the curious >
The conversion is 1.6 times for the small Canon bodies, so take your 28, multiply by 1.6 and you have the equivalent in 35mm terms (Which is 45mm or so). And it's all because the sensor is smaller than a 35mm frame of film, not because of the space the adaptor takes up. The conversion applies to all lenses and doesn't change. And it doesn't affect DoF, it's really just like a crop out of the centre of the 35mm frame. -Adam -- 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.
