Cotty wrote: >On 02/10/07, ann sanfedele, discombobulated, unleashed: > > > >>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. >> >> > >Your questions have been answered already Ann, but note that the adapter >you refer to - yes it does put a tiny bit of space between the back of >the lens and the camera - wisely observed. However, this brings the >Pentax lens into the correct 'zone' (if you like) for focussing. So it >does not contribute in any way in changing the angle of view of the >lens. (For angle of view, read 'effective focal length' but this is a >disclaimer as I have not been gotten by the focal length bodysnatchers :-) > >So - your Pentax lens plus adapter on a Canon camera - the distance >between back of lens and the sensor is the same as your Pentax lens >without adapter on a Pentax camera > Ah! interesting.
>- back of lens to sensor distance is >the same. This is because not all camera manufacturers make their >cameras with the same distance between the sensor and the front mounting >area for the lens. Hence some conversions to lenses are easier than >others. Pentax to Canon being a good example. > >Canon to Pentax is not a viable proposition - in more ways than one!! > >HTH > > thanks for the extra info... back to non tech mode for me now a > > -- 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.
