BTW, between the Olympus OM-4 or OM-4Ti, on the one hand, and the Nikon FM3a, I prefer the OM because it has a much larger and better viewfinder
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The OM-4Ti, with either the Motor Drive 1 or 2, is much faster (5 fps) and quieter than the FM3a with MD-12 motor drive (3 fps).
Have you compared the OM-4 viewfinder side by side with an FM3a?
Some time ago I compared several viewfinders of SLRs, including Nikons, Contaxes, Pentaxes, Olympus OM1, and others, by orienting the cameras so that my left eye was looking through one camera and my right eye another camera, with the same focal length lens attached to each.
In this way I could directly compare magnification, brightness, contrast, and ease of focus (i.e., how easily the view would 'snap' into and out of focus.)
After that comparison, my favorite viewfinder overall was the FE2. The differences between all of them were actually quite minor, certainly not enough to make any difference in field usage. I preferred the Nikon focusing screen as the 'lines' between the split image, microprism, and matte areas are virtually invisible. Other focusing screens had a noticeable 'line of demarcation' so to speak; nothing that would get in the way of shooting in any way, just a personal preference.
These days I would never use a motor drive on an SLR, unless it is built-in, and in that case it would always be set to single exposure.
