Question about manual focus ?????

I wear glasses but when I look through the viewfinder on my cameras I don't wear them but I do adjust the dioptric correction so my view is in focus.

My question is, when I do this and manually focus, will my photos be out of focus ?

Probably a dumb question but this thought just popped in my head the other day when I was working with my old 5D.

If this is the case (out of focus), what do others do who wear glasses when they manually focus to get a tack sharp image ?

Appreciate any and all replies in advance.

The purpose of the diopter is to replace your glasses, your photos should be fine.

When you use AF do the images look in focus correctly on the VF screen, and in the final image? If they do, then you will get the same result using manual focus.*

*There is one other thing you have to be aware of. Because of the way that the VF optics work with the standard screen, you will see the image in the viewfinder with a Depth of Field corresponding to an aperture of at the widest f/4. If you are focusing using an aperture wider than f/4 you may have that narrower DoF anywhere within the wider DoF range you would see at f/4. You can get additional screens for a number of Canon bodies that allows you to see the narrower DoF of wider lenses for manual focus. The problem being that for lenses narrower than f/2.8 they start to become very dim. As many zoom lenses, even L zoom have maximum apertures of f/4 or even f/5.6 with AF the brighter standard viewfind option aids with composition etc.

Alan

frayne wrote in post #17623489
I wear glasses but when I look through the viewfinder on my cameras I don't wear them but I do adjust the dioptric correction so my view is in focus.

My question is, when I do this and manually focus, will my photos be out of focus ?

No

One of the reasons I ask is that I am getting into focus stacking and having a hard time getting objects in focus at different focal lengths. It seems very difficult regardless of if I use manual or auto focus to get good sharp results once the stack is rendered. I'm doing landscapes and not macros at this point so it should be a bit easier with a longer depth of field one would think.

Instead of using the VF, try live view. It is so much easier to zoom in 10x and get that perfect focus exactly on the object you are wanting.

just a question: why don't you wear glasses when you look through the viewfinder? I wear glasses that have progressive focal length and I look through the viewfinder without any problems.

or get a sony and u can zoom thru the vf,i wasn't sure if i would like electronic vf but with manual focus its just great,i wish dslr had this feature its crazy useful

frayne wrote in post #17623538
One of the reasons I ask is that I am getting into focus stacking and having a hard time getting objects in focus at different focal lengths. It seems very difficult regardless of if I use manual or auto focus to get good sharp results once the stack is rendered. I'm doing landscapes and not macros at this point so it should be a bit easier with a longer depth of field one would think.

One issue with the typical dSLR for manual focus is the fact that the focusing screen is made to be 'BRIGHT', but not 'PRECISE' to better indicate accurate focus!
That is one reason that many recommend using Live View for focus confirmation accuracy, especially with the magnified view.

gjl711 wrote in post #17623547
Instead of using the VF, try live view. It is so much easier to zoom in 10x and get that perfect focus exactly on the object you are wanting.

The old 5D does not have live view but I will try it on my other cameras. Thank you for the suggestion.

itsallart wrote in post #17623552
just a question: why don't you wear glasses when you look through the viewfinder? I wear glasses that have progressive focal length and I look through the viewfinder without any problems.

Probably just old habit I guess. I've never heard of glasses that have progressive focal length as I would think all glasses would have that. I'll have to check with my optometrist.

Most glasses have single focal length let's say for reading or computer etc. Progressive lenses are very expensive and not everybody; some go for bifocals or even trifocals as a cheaper alternative (you can tell them by visible lines between the different focal lengths; some go for 2 pairs like reading glasses and all-day glasses depending on the individual's condition. I would have needed 3 pairs: one for reading, one for computer and one for driving which I find crazy, so I opted to go for progressive lenses and have not looked back

Like Renata, I too have progressive lenses. They are super and after a few days you forget you are wearing them. I never take my glasses off to take photos - I hate to think where they would be now if I did as I'm frequently to be found on top of a Scottish mountain in 50 mph gales!!!

Annie, they would be gone with the wind

itsallart wrote in post #17624655
you can tell them by visible lines between the different focal lengths; )

there are options that don't have distinct lines.

of course my only knowledge of this is recent research due to my own fading vision, but a couple of friends love them.

frayne, live view is the way to go for what you are doing. I can't stand having glasses on when shooting, i even store my sunglasses away. My camera bag is sufficient to protect against both 50 mile an hour winds and levying them behind on top of a mountain.