Viewfinders: I am puzzled.

Started 2 months ago | Discussions thread
Tommi K1 Senior Member • Posts: 6,820
Re: It's the image in the viewfinder that matters, not its physical size.

Tom Axford wrote:

Tommi K1 wrote:

The eye-level viewfinder magnification is not altered by format.

The viewfinder magnification is not altered by format.

I'm not sure why you introduce the term "eye-level"? That's irrelevant.

Because there is difference what viewfinder people are talking about. Just a side note.

It is measured by using 50mm lens focused at infinity.

Only if you are using a full frame camera. The OP is using a Micro Four Thirds camera, for which the normal focal length is 25mm, not 50mm.

Wrong. If is always measured using 50mm regardless the format.

Be it a medium, large, small or what ever format, it is always measured by using 50mm lens focused at infinity.

That is why E-M1 has 1,48x magnification instead 0,74x. There is no equivalence as it makes it wrong.


You are changing focal length, you don't do that. You keep it as 50mm all the time regardless what format you use.

There are many other values too, pupil distance as well eye relief, frame coverage etc that all are changing the eye-level viewfinder magnification and values.

There are as well many viewfinders:

  • Eye-level viewfinder
  • Waist-level viewfinder
  • Iron-frame viewfinder
  • Reflex sight viewfinder


The magnification value is that how much the subject is magnified through the eye-level viewfinder. E-M1 has 1,48x so it is 1,48 times larger than naked eye would see it.

That means:

  • 0,75x things appear three quarters of the size
  • 0,5x half as big
  • 0,9x nine-tenths as big
  • 1,5x halftimes larger
  • 2x two times larger

There is a shoal of red herrings here.

All that are facts, but don't care, just go ahead and revision all as you please.

Equivalence seems to be everywhere in this generation.

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