Archived posting to the Leica Users Group, 2012/07/16
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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 >