wiltw,
Your error is likely due to just missing focus. Focusing by eye has an inherent margin of error that gets larger with low light, bad vision, etc. I'm just referring to the image as projected on the ground glass/viewing screen. Your vision (or lack thereof) won't affect the sharpest focus there since it is being projected onto a receiving surface that is not going to be affected by your vision. Getting things as sharp as possible, however, requires good vision and proper magnification. Even then, there is error. That's why auto-focus is better than focusing by eye; it is inherently more accurate.
What is not going to happen is finding two different places for sharp focus, one without glasses and one with.
Best,
Doremus
Alan,
I bought a pair of flip-down magnifiers (4x) that attach to the nosepiece of my glasses. I use just glasses for viewing the scene, glasses with flip-down magnifier for general viewing of the ground glass and, for fine focusing, glasses plus flip-down magnifier plus a 5-6x loupe. Never had a problem finding sharp focus.
Maybe a pair of flip-down magnifiers would work for you. Another alternative I use a lot is to keep my progressive glasses on a cord around my neck and a pair of 3-4 diopter reading glasses in a handy pocket. When I need to view the ground glass, the progressives come off and the readers go on.
FWIW, the reading glasses/flip-down magnifiers also help reading the mm scale on my cameras' beds and when setting shutter speed and aperture.
Best,
Doremus
How do two lenses in each eye work?Contact lenses are the way to go. As for myself, I wear two lenses on each eye: one eliminates severe distortion of cornea, and one to correct vision. Result…perfect vision, no need for eyeglasses. Best solution for focusing lens.
However, I do protect eyes from the elements, especially windy days, not so much from the wind itself as from grit, etc blowing in the air and causing irritation. by wearing sunglasses (different shades depending upon season…thus further protecting eyes).
I'm riding back from the Charlotte V.A. at this moment, after an eye exam and it looks like I'll be getting cataract surgery very soon.
I chose distance vision and will still need readers, but I'm hopeful I will now be able to use diopters, the doc said my current vision would call for about a -11 lens, as is, so I'm looking forward to some reduction of that condition.
Good luck with your operation.
How do two lenses in each eye work?
A soft lens is inserted, and over that a hard lens. My optometrist lives and breathes optometry and is one of the very best in NYC. I found Him 40 yrs ago when ophthalmologists failed to discover reason for my deteriorating vision (their concern is the medical health of the eye, not quality of vision), and other optometrists equally unsuccessful.
Soft lenses correct focus but not astigmatism. Hard lenses can correct astigmatism which is you your ophthalmologist has achieved that success for you. Enjoy that success.
When one eye was done, the other eye's cataract was so immature that the doctor called it "juvenile".
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