Camera

What lens should you get??? Let me help you make an educated decision about getting a lens for your photography. What is the difference in Prime or Zoom. What focal length is right for your needs. what makes a lens fast or slow. Presented by http:www.samys.com , the answers are all right here. Buying a lens for your digital SLR has never been easier.

Canon site http://www.usa.canon.com/consumer/controller?act=ProductCatIndexAct&fcategoryid=111

Duration : 0:9:58

(more…)

This is Part 2. Solar Training, Understanding optics of Parabolic Mirrors and Fresnel Lenses. Cheap Telescope astronomy. Telescope first surface mirror.

PART 1 IS HERE:

http://www.youtube.com/watch?v=QpkWTdXwTnw

Duration : 0:5:37

(more…)