|Fun with lenses|
Posted by c2cdiver on April 08, 2006 at 16:26:22:|
In Reply to: Eric's Images of Catalina with the Sea Divers posted by seahunt for Eric S on April 05, 2006 at 19:24:01:
Instead of the extension tube, try a screw on diopter. The higher the + the better, you can even stack them. Just be sure to screw it on underwater, or you may not be able to remove it. Also, check for bubbles. There is a 60% loss in water, thus a +10 in water is only a +4 magnification. Besides the magnification, it will also reduce the focal length. How much? Stick the setup, in a bathtub and take a picture of a ruler.
With an external filter, you can always take it off and shoot the 20mm at Harbor Seals
|Optional Link URL:|
|Optional Link Title:|
|Optional Image URL:|
|Post Background Color:||White Black|
|Post Area Page Width:||Normal Full|
|You must type in the
scrambled text key to
This is required to
help prevent spam bots
from flooding this BBS.