Hmmm, is my dodgy rule of "several posts in a rule = a nutter" applicable to the above? It sorta smells that way.

Hmmm, is my dodgy rule of "several posts in a rule = a nutter" applicable to the above? It sorta smells that way.

It is one of the EU nutters, spouting technobabble and collecting 5-votes from sockpuppets.

Mackita is a sockpuppet of Zephir, a proponent of his own aether wave theory, not EU. https://www.reddi..._zephir/

Imagine a completely flat 70mm Zoom Telephoto EF 20-200mm f/2.8 lens on the back of your phone

Imagine a completely flat 70mm Zoom Telephoto EF 20-200mm f/2.8 lens on the back of your phone

200/2.8 = 75mm. Can't change the laws of physics, you NEED a 3" diameter lens front. Now, try to squeeze 8 inches of back focus into your phone.

There is a lot more to consider than chromatic correction. Spherical aberration, distortion, coma, astigmatism. Correct them, you might have a lens.