Beginner's photography tutorial with a comparison chart of aperture values.
Want to get into photography and thinking of which lens to purchase? Here’s an easy visual to help you get started.
ISO comparisons, all shot at f/5.6 aperture & 1/200 shutter speed
Twin lens reflex camera comparisons Minolti Autocord, Rolleiflex 2.8F and Rolleiflex 3.5 T Type1
Free Cheat Sheet: what your camera captures at every lens' focal length | Digital Camera World
focal length image comparison chart which lens should you use for taking pictures photos
Here is a side by side lens price comparison for Nikon & Canon. If you are doing some price shopping, this can help.
Canon & Nikon shooting modes explained
nikon and canon lens price comparison
The B&H Guide to Exposure: Understanding Shutter Speed.