> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Keith Green > Sent: Tuesday, June 10, 2003 1:18 PM > To: [EMAIL PROTECTED] > Subject: EOS Hand-holdable speeds > > > We all know that the slowest recommended hand-held speed for a lens is the > reciprocal of the focal length, but is this only for 35mm or does it hold > true for larger format, and more importantly for smaller such as a digital > sensor? > > If I handhold a 200mm lens, then I shoot at say 1/250th of a second. > If I use the same lens on a digital camera with a 1.6x > magnification, due to > a small sensor, should I use the same or a higher speed, based on a 35 mm > equivalent of 320mm focal length. > > I haven't gone digital yet, but am just curious. > > Cheers > > Keith >
Hi Keith, I've considered this (but not done any practical field testing yet so YMMV), and as far as I can tell it's a matter of image size and apparent magnification. So I think the rule still works but you need to apply it using the 35mmEFOV (35mm Equivalent Field Of View), focal length. I've been using the usual rule this way and even at high magnifications in Photoshop it seems to work pretty well. I don't know if this is 100% right but at least none of my images have camera motion blur when inspected in PS. I don't know if this is just from using an overly conservative shutter speed or if using the reciprocal rule conservatively just matches up with how slow I can hand hold. On film during some testing using a non-IS lens I found that for critically sharp images the reciprocal rule is not really good enough so I tend to fudge it slightly faster when shooting on the go. Most people who say they can hand hold at or even below the reciprocal shutter speed rule are not considering critical sharpness, only good enough on paper and for the most part this will be true. I just hate to have a great shot blown by camera motion induced blur. Cheers/Chip * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
