Special glasses for seeing my viewfinder, or the camera menu screen

[Jeff S]

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4 minutes ago, MikeMyers said:

Can you please elaborate?  I've never thought of taking my camera to my ophthalmologist other than for getting my special glasses made.  Did your doctor give you a full vision check as you look at the vision charts through the camera?   Fascinating.  Once I know more, I will ask my eye doctor about this.

I explained the 2m focus patch optimization, used trial diopters over VF, and he had other devices/lenses to allow me to see the effect of varying distance prescriptions. 
 

Another issue I didn’t note earlier is that it’s important for focusing to keep one’s eye centered in the VF.  With the larger diameter M10 VF, this requires a bit more care.  That’s another reason I personally wouldn’t want to deal with progressives/bifocals, etc, making sure that my center vision was unimpaired. 
 

Jeff

[jdlaing]

The progressive lenses are ground like this:

It forces you towards the center of the lens.

Welcome, dear visitor! As registered member you'd see an image here…

Simply register for free here – We are always happy to welcome new members!

Edited November 17, 2020 by jdlaing

[Jeff S]

Many people use these effectively; just not for me. Same with contact lenses.  Good to have choices.

Jeff

[MikeMyers]

Just now, jdlaing said:

The progressive lenses are ground like this:

 

Welcome, dear visitor! As registered member you'd see an image here…

Simply register for free here – We are always happy to welcome new members!

Now I understand some of the above comments - but I don't use those.

When you get time, look up Essilor X-Series Varilux Progressive Lenses.  They are quite expensive, but they do a lot more.

Or just start here:  https://www.essilorusa.com/products/varilux 

Similar pages from other countries give a lot more technical information about these lenses, and what is possible.

[MikeMyers]

7 minutes ago, Jeff S said:

I explained the 2m focus patch optimization, used trial diopters over VF, and he had other devices/lenses to allow me to see the effect of varying distance prescriptions. 

It's probably my fault, but I have no idea what a "two meter focus patch optimization" means.

Can you please link to a description of this online, so I can learn about it?  Once again I am totally lost.

[Jeff S]

Just now, MikeMyers said:

It's probably my fault, but I have no idea what a "two meter focus patch optimization" means.

Can you please link to a description of this online, so I can learn about it?  Once again I am totally lost.

The little square in your VF that you use to focus is set to appear at a virtual distance of 2m.  Hence vision for focusing is optimized at that distance.  But, as discussed, one also needs to be able to see at other distances.

Jeff

[jaapv]

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19 hours ago, MikeMyers said:

I am so lost right now - for my entire life both the image through my viewfinder and the "focusing image" are equally sharp, and I just superimpose one over the other.  I just tried it, looking at a cruise ship maybe a mile away from me, and both images were perfectly sharp - to my eyes, at least.  This is with wearing my normal prescription (progressive) glasses.

As long as your eyes have the accomodation ablility to focus on the different distances -if needed aided by appropriate spectacles- , the computer between your ears will be able to produce a sharp image. Unfortunately, that ability will diminish with age.

[MikeMyers]

14 minutes ago, jaapv said:

As long as your eyes have the accomodation ablility to focus on the different distances -if needed aided by appropriate spectacles- , the computer between your ears will be able to produce a sharp image. Unfortunately, that ability will diminish with age.

I have had cataracts repaired in both eyes, with my eye's lens replaced with an IOL.  It is fixed - I'm no longer supposed to be able to focus.  The way I'm supposed to focus is to view tings through the appropriate part of my progressive lenses in my glasses.  I guess that's what I'm doing, without realizing it.  Essilor Varilux X-Series eyeglass lenses are different than regular progressive lenses.  Each lens includes the ability to also see what the other eye sees.  All of this is part of the reason why they cost so much.

 

Anyway, the bottom line is that I'm not consciously aware of several of the things we're discussing here.  I'm not aware of any issues with the rangefinder.  What I am aware of, is that I can't see the full view of the viewfinder - I guess if I were to get the special correction lenses that go on the viewfinder, my eye would be closer, so I would see more.

[Jeff S]

All of which illustrates that we’re all different... different conditions, different comfort levels, different budgets and goals...and that the only way to know what works best is to test and/or work with a trained professional.  Diopters are among the easiest things to test, and free.  It does help, however, to understand how your camera works.

Jeff

[jaapv]

50 minutes ago, MikeMyers said:

I have had cataracts repaired in both eyes, with my eye's lens replaced with an IOL.  It is fixed - I'm no longer supposed to be able to focus

That is fortunately not quite the case. In this stage the original lens will have hardened to the consistency of the implant lens, thus replacing it will not make a difference in this respect. . Any accomodation will be produced by the Cornea and small muscles that slightly shift the lens, in some cases quite effectively. I had a Cornea transplant and IOL in my left eye, and stil I can focus over a decent range, from about 30 cm to about 1.50 m, so I can do öffice work without glasses. Even up to 10 m is acceptably sharp for general purposes, 70% according to the optometrician, I do notice that focusing is a bit slower though, about the same as an X1  .

[MikeMyers]

1 hour ago, jaapv said:

That is fortunately not quite the case. In this stage the original lens will have hardened to the consistency of the implant lens, thus replacing it will not make a difference in this respect. . Any accomodation will be produced by the Cornea and small muscles that slightly shift the lens, in some cases quite effectively. I had a Cornea transplant and IOL in my left eye, and stil I can focus over a decent range, from about 30 cm to about 1.50 m, so I can do öffice work without glasses. Even up to 10 m is acceptably sharp for general purposes, 70% according to the optometrician, I do notice that focusing is a bit slower though, about the same as an X1  .

Fascinating - I felt like my eye was focusing slightly, but since I thought that was impossible, I considered it just part of my imagination.  So maybe it's "real"?  Wow.

[jaapv]

1 hour ago, MikeMyers said:

Fascinating - I felt like my eye was focusing slightly, but since I thought that was impossible, I considered it just part of my imagination.  So maybe it's "real"?  Wow.

And don't underestimate your brain; it can:

1. Coordinate two "cameras" that can be as diverse as a Lomo and  a Nikon 850

2. Correct the rendering of lenses that show just about every aberration in the book

3. Correct for an AWB that would makethe worst sensor look great, and has a memory effect to boot

4. Compensate for an abysmal resolution

5. Perform an incredible digital zoom

6. Needs no updates

7 Can create a vision that simply does not exist

And still deliver a fantastic image.

 

[a.noctilux]

On 11/17/2020 at 10:27 PM, MikeMyers said:

It's probably my fault, but I have no idea what a "two meter focus patch optimization" means.

Can you please link to a description of this online, so I can learn about it?  Once again I am totally lost.

😉headache link ...

[Guest]

I ordered progressive lenses for my frames Monday for this very reason. Rx sunglasses too.  👍

[MikeMyers]

I wish I had done that - my glasses would then be easier on my eyes while shooting outdoors.  Maybe I can add it later - if so, I'll get the coating that turns dark in sunlight, and back to clear when I come indoors.

I did order the scratch resistant coating.

[Jeff S]

I always wear prescription sunglasses in daylight due to light sensitivity.  Eye doc tells me  that’s a major reason I’m the only one in my family without cataract issues.

Jeff

[john sharaf]

Terrific dialog about eyeglasses and looking through M camera, but what about the ware on the coating from the physical contact with the camera? I always get the scratch resistant coating but inevitably it wears off, in a short time, if you use cameras every day.  My current workaround is to grin and bear it but I'm due for an eye exam and new glasses imminently; is there any specific coating that is better than the rest?  From what I hear, glass progressives that are more durable to this effect are ungainly. I don't recall ever seeing any. Advice?

 

[Alberti]

I am a glass bearer and M-user for over 35 years. Never had a scratch on the lens. [ Essilor, Varilux, Zeiss long-line, 'plastics' if I am correct]

My camera's have a rubber eye trim.