Dr John Photography:

Home

Classes and Workshops

Books

Photo Gallery

Articles and Calculators

Telescopes and Binoculars

Used Equipment

Biography

Email


www.allocca.com:

The Migraine and Neurotransmitter Solution

BrainictyTM Transcranial Neural Network Optimizer CDs and MP3s

Starship Diabetes

Books

Library

Chat Room































Astronomy Articles


Introduction to Non-Tracking DSLR Astrophotography (click)

Lens Simulations (click)

Nikon D810 vs Nikon D810a with Photoshop Processing (click)

Comparison of Optics for Imaging the 2017 Solar Eclipse (click)

Tokina 17-35 mm F4 FX AF for Nikon Test Shots (45 mb) (click)

Night Vision - The Red Myth (click)

Binoculars (click)

Travel Case for Celestron C6 Telescope (click)

Lens Exposure Time Calculator

Field of View Calculator