>> If I use a 300 mm IS lens on a D30 camera, the effective focal length >> becomes 480 mm. Does the IS still help two stops or does the change in >> focal length also change the effectiveness of the IS. Since there is a 60% >> increase in focal length would there also be a 60% decrease in the >> effectiveness of the IS?
One way to look at it: IS effectivity is decreased 60%, just as DOF is decreased (also by 60%?). But this is only because of the relative cropping compared to a full-frame film image. But another way to look at it: IS effectivity is the same, since any cropped portion of the digital image compared to the same cropped portion of a film image will appear the same. Dave Herzstein [EMAIL PROTECTED] http://www.kjsl.com/~dave ________________________________________________________________ GET INTERNET ACCESS FROM JUNO! Juno offers FREE or PREMIUM Internet access for less! Join Juno today! For your FREE software, visit: http://dl.www.juno.com/get/web/. * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
