Archived posting to the Leica Users Group, 2001/08/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]The element he made was perfect to my eye, and I could detect improved performance when I aligned the axis properly for my astigmatism. That is done by estimate. There are no azimuth numbers on the tiny eyepiece frame. He took about a month or 6 weeks to make the lens, but that could possibly vary with his circumstances. He was in the process of moving into a new residence, when I asked him to do my work. I thought the virtual image was at 1 meter, but you may well be correct. At any rate, you have the correct concept. My farsightedness and inability to accommodate are such that I need correction at all distances, including infinity. I hope this helps.............Julian - ----- Original Message ----- From: "Mxsmanic" <mxsmanic@hotmail.com> To: <leica-users@mejac.palo-alto.ca.us> Sent: Sunday, August 12, 2001 7:40 AM Subject: Re: [Leica] correction lenses Julian writes: > The man who did mine charged $200 USD. Sounds reasonable. Is the element he made visually clean (that is, no anomalies when you look through it)? > This is because Leica builds a -0.5 into the > camera's eyepiece. Hmm ... so the virtual image is 2 metres away in the viewfinder (if I remember the application of diopters here correctly), which implies that you would need correction if you have trouble at this distance. From what I've read, almost everyone (even those slightly nearsighted or farsighted) can see pretty well at a distance of 2 metres, which is why this distance is frequently chosen for viewfinders by camera makers. > I have admired the pictures on your website. Thanks!