konica

I recently got a Konica autoflex tc. I put weincell 1.35 v batteries in it and the light meter needle moves somewhat but it doesn’t go Out of the under exposed area. I tried changing the shutter speed and the aperture but it just wiggles around in the red area even when I point it directly at a...

So I'm a beginner when it comes to photography; I know the general terms like aperture, shutter speed etc, but someone asked me what the length of my lens was for my recently purchased Konica Autoreflex T3, and I have no idea on how to find it.