Archived posting to the Leica Users Group, 2012/07/16
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]a wonderful, helpful response Geff, thank you very much, Steve On Jul 16, 2012, at 2:19 PM, Geoff Hopkinson wrote: > Steve we once had a LUG member who was an opthamologist (I think). I'm not > sure if he's still on board. You can try an archive search for some of his > posts. I'll see if I can dig up the copies I made some time back. > > The short answer is that it is best to try different diopter corrections > with your camera to see what suits you personally. An > Opthamologist/Optometrist or spectacles retail outlet should be able to > assist. You should be able to look through your camera with a range of > temporary lenses as used to determine spectacles prescriptions. > > M camera viewfinders have Minus 0.5 diopter correction built in. This means > that the image seen appears to be two metres in front of the camera. > Dividing one metre by the diopter figure gives the focus distance (not the > magnification). > > Leica Correction Lenses are available in half diopter increments in a range > for nearsighted to far sighted eyes > > The best Leica Correction Lens for the individual is subject to several > factors > Your eye's accommodation, which is its ability to change focus from far to > near objects. Declines with age. > Astigmatism, which is a vision defect where light focuses on two different > points within your eye. The spherical Correction Lenses cannot correct for > this. > > Are spectacles still to be worn with the Correction lens fitted? > > Leica Camera also offer 1.25x and 1.4x Magnifier attachments which can have > Correction Lenses fitted on the rear surface. Anecdotally these appear to > also include some diopter correction. It would be best to test with the > Magnifier on and off the camera when trying different diopter corrections. > > On the actual hardware, you probably know that the Leica ones are hard to > find and expensive. Not easy to find them in stock to try out before > purchase. There's a Japanese variable one (WalterX) which is even more > expensive and bigger too. It is meant to rotate to address astigmatism... > maybe. I 'm not aware of any other brands. > > > > Cheers, > Geoff > http://www.pbase.com/hoppyman > > > > On 17 July 2012 06:41, Steve Barbour <steve.barbour at gmail.com> wrote: > >> I am looking for advice re diopters for the M9....must the diopter be >> leica, does anything else fit and serve as a replacement? >> >> where can I buy them cheapest ? >> >> >> How to determine what power diopter is the best fit for my eye, with out >> the benefit of trial and error with diopters of various strengths on the >> camera. >> >> >> thanks, >> >> >> >> Steve >> >> >> >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information >> > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information