Home Forums Am I a Fauxtog? Feel free to turn your critical eye my way Reply To: Feel free to turn your critical eye my way


Tests are done.   Both the Canon T2i and 5D Mk III have brighter viewfinders than Nikon’s FM 10.  The FM 10 is, however, smaller and lighter.


I put the 28-135 zoom on the 5D, thinking that would be comparable to what was on the FM 10, but when I dug it out, I discovered it has a 35-70 f/3.5-4.8 lens on it!



The rebel has Sigma’s 18-250 f/3.5-6.3, which I find great for general use.  Their new version is even smaller and lighter


So, anyway. not trusting my eyes, I set up a continuous fluorescent in a softbox at the edge of my desk, placed each camera in turn about the same distance from the softbox and used a Sekonic light meter to measure the light coming through the viewfinder.  I set ISO to 8000 and shutter to 1/20th.  Here are the apertures the light meter suggested:

At the shortest zoom settings

Rebel — 5.0

FM 10 — 5.6

5D — 6.3

At 70 mm, give or take

Rebel — 5.6

FM 10 — 5.0

5D — 5.6

Also, I put a Sigma 85 mm f/1.4 on the 5D, which resulted in a reading of 9.0, so as expected, if you use faster lenses, you get a brighter viewfinder.  Canon’s 24 mm f/1.4 on the 5D scored 8.0

For giggles, I put the Sigma 85 on the Rebel.  To my amazement, it also scored 9.0, so its viewfinder is not too shabby!  Although, it only shows 95% of the scene so things tend to creep into the edges of the frame.