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Reply | Forward Message #98 of 597 |
Re: origin of f ?

The focal ratio is defined as the focal length of
the objective divided by its diameter. A Newtonian
telescope with a 6-inch diameter mirror that has a focal
length of 48 inches has a focal ratio of 48/6 = 8,
usually written "f/8."
Tue Dec 18, 2001 1:39 am

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pops_91710
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Forward 		Message #98 of 597 |
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Thank you Pops, that makes sense....
martin_63026
Offline Send Email 		Dec 17, 2001
1:38 am

The focal ratio is defined as the focal length of the objective divided by its diameter. A Newtonian telescope with a 6-inch diameter mirror that has a focal ...
pops_91710
Offline Send Email 		Dec 18, 2001
1:39 am

SYLLABICATION: f-num·ber <br>PRONUNCIATION: fnmbr <br>NOUN: The ratio of the focal length of a lens or lens system to the effective diameter of its...
pops_91710
Offline Send Email 		Dec 18, 2001
1:52 am

I love photography, I'm working on my website, if you're interested, take a look. Most images have "Hot Spots", try and find the way in.<br><br>www.b311.com...
b311viper
Offline Send Email 		Dec 26, 2001
9:58 pm

<a href=http://www.b311.com target=new>http://www.b311.com</a>...
b311viper
Offline Send Email 		Dec 26, 2001
10:02 pm

I shoot with a F100 with a 17-35, 28-70 & 80-200 AF-S Lens, also use a 995, I'm chomping at the bit for a D1x but I'll probably take a wait and see position...
b311viper
Offline Send Email 		Dec 26, 2001
10:11 pm

Hello and happy new year,<br><br>I have just bought a Coolpix 995 to replace my canon IXUS 300, I love the IXUS 300 but I am getting into Quicktime VR panorama...
badestmamajama
Offline Send Email 		Jan 3, 2002
12:48 pm

Hey Nikon Luvers,<br><br>I just joined. I have only used a nikon camera. I hope I get to learn alot from this club.<br><br>Later,<br>CMP...
capturedmemoriesphoto...
capturedmemo...
Offline Send Email 		Feb 17, 2002
6:50 am

Hello Nikon members:<br><br>Is anyone interested in joining a group to travel to Saint Petersburg, Russia this summer for a 5 day photoshoot? This could be fun...
jeff_koski2002
Offline Send Email 		Feb 20, 2002
5:07 pm

Hi everyone!<br><br>I'm planning to get a Nikon N80. Was wondering if any users of the N80 out there have any cons about it? I initially wanted a N65, but with...
clemsuxx
Offline Send Email 		Feb 21, 2002
7:05 am

Hi Clem, Welcome aboard. Very short and to the point. BUY the N-80. You will never be sorry you spent a few more bucks. George...
wa2ucj
Offline Send Email 		Feb 22, 2002
2:19 am

Thanks George! I like your answer :)<br><br>:)<br>clem...
clemsuxx
Offline Send Email 		Feb 22, 2002
7:05 am

Hi everyone,<br>Please critique the photos in my new album titled "World Images" Let me know what is good, what needs improving. Suggestions always welcomed....
jeff_koski2002
Offline Send Email 		Feb 26, 2002
2:09 am
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