OVF vs EVF put to rest

Started Sep 16, 2012 | Discussions thread
TrojMacReady Veteran Member • Posts: 8,729
Re: OVF vs EVF put to rest

Piginho wrote:

TrojMacReady wrote:

Piginho wrote:

TrojMacReady wrote:

No OVF with ground glass will be able to show you detail equivalent of each pixel in say the final 24MP image, regardless of how good your eyes are. An EVF can, regardless of its resolution, as long as there's a quick magnification button that allows you to magnify up to pixel level (of the sensor).

And from where have you derived these facts? Please provide links/references!

Here's one simplified explanation and example:


This doesn't answer the question in any way, though it was an interesting read. Also, ground glass screens haven't been used in SLRs or DSLRs for more than 30 years. Viewfinder screens are plastic and some are fresnel type. Minolta were at the forefront of this technology and most recently in Sony implementation used spherical acute matte screens.

Is this a discussion of semantics or one with substance? Of course they are no longer made of real glass, but most people still refer to them as ground glass. Glasses that people wear are often made of plastics too, are you going to correct people calling them glasses still?

The closest that I could get to any kind of information regarding resolving power is in the following link.


It has to be born in mind that this link is talking about ground glass, but a simple calculation would indicate at least 9Mp resolution should be possible. How this relates to the more modern screens in a Sony A900 for example, I cannot say, as the information seems to be unavailable. What makes me laugh is your assertion that "No OVF with ground glass will be able to show you the detail equivalent of each pixel in say the final 24MP image," when you have no definitive evidence to back this claim.

You mean I have 20/12.5 vision and actually compared them (the A900 is still the OVF benchmarks for DSLR's) rather than your theorizing and assumptions about EVF's? Yes, you're funny like that at times.

As it happens, you may be right, but that's yet to be determined.

You mean you have yet to make the comparison yourself, apparently.

What is almost certainly true, based on the research that I've done so far, is that the OVF in an A900 or similar will have at least around 4 X the resolving power of a 2.4Mp EVF.

Do share the exact calculations you used and all the variables involved.

Also, by posting your link and some of your latest comments, you are attempting to move the goalposts of the debate. You're trying to make it about DOF and how it's seen in the viewfinder. What's the title of this thread?

I first reacted to someone making claims about DOF preview, suggesting they are similar in their representation of DOF (preview). That was you. The rest of that discussion wasn't with you.

My question to you was about the source of your knowledge about resolution on GG screens, not DOF issues.

You asked what the claim that GG limits the resolution, is based on. I said experience and gave an example. You're in the process of admitting it's true.

After that question, I didn't reply to you any further about DOF issues. Have you activated the posting tree or are you staring at a flat view of the forums?

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