Click here if you are having trouble logging into the forums
Privacy Policy |
Please read our Terms
of Service | Signup and
Troubleshooting FAQ | Problems? PM a Red or a Green Gu.... uh, User
oldtimer
sage
Reged: 11/13/08
Posts: 299
Loc: NW Illinois
|
|
Here is a question for you bino experts; what is the average focal f ratio of bino lenses. I have been told that most 35 to 100 mm binos are about f 3.5. Is that true? The reason I ask is that many years ago I had a pair of 100mm binos and they were very colorful. Today I have a 102mm F 6.5 achro and the color isn't too bad.
Edited by oldtimer (09/22/09 08:20 PM)
|
GlennLeDrew
Pooh-Bah
Reged: 06/18/08
Posts: 1267
Loc: Ottawa, Ontario, Canada
|
|
A closer value to average would probably be f/3.8. I've seen then vary from f/3.3 to f/4.5 in the more conventional forms, but there are some 'long ones' at closer to f/6. Then there's the Vixen 80mm bino-scope which uses f/11 objectives.
--------------------
Home-made 11X50 right angle bino, 8.1 deg. FOV
Modified 26X100 bino, 3.5 deg. FOV
Home-made Mk II RA bino, using interchangeable objectives and eyepieces
My Gallery
Mediocre minds discuss people. Good minds discuss events. Great minds discuss ideas.
|
|
1 registered and 7 anonymous users are browsing this forum.
Moderator: EdZ
Print Thread
|
Forum Permissions
You cannot start new topics
You cannot reply to topics
HTML is disabled
UBBCode is enabled
|
Thread views: 98
|
|
|
|
|
|
|
Previous
Index
Next
Threaded
Edit
Reply
Quote
