I'm confused by something and would appreciate any assistance.
Does doubling the focal length, while leaving the aperture unchanged,
change my f# by a factor of 2?
Does this imply a doubling/halving of irradiance, E?

No, I haven't lost my mind and it is definitely not OT.
I'm trying to make a "lens cap" for the Sigma 14mm wide angle lens with the
integral petal sunshade and I want something that fits over the whole thing
snugly.  I think I can take some sheet styrene of .005" or .010" and roll ...

I want to purchase a B1 head and a RRS clamp. I got stuck, becuase of
the following questions:
1. What's the difference between 1/4" Threaded Top Plate and  3/8"
Threaded Top Plate? Which one do I want esp. with respect to easy

I'm about to buy a 350D with 18-55mm lense but am not sure whether to
go for the USM version or not. As far as I can tell the only way to get
the USM version in the UK is in the silver body kit from Jessops for
£700. Otherwise the non-USM is widely available for £600 upwards. Is

"Gilbert Dewey Gaedcke III, 41, was rescued Friday afternoon after a
teenager on a helicopter tour spotted him stumbling across the rocky lava,
trying to attract attention with a mirror from his camera. "
http://www.cnn.com/2005/US/07/24/volcano.missing.texan.ap/index.html

OK, enough of these difficult mandates. It's summer/winter, time to take it
easy. The new mandate is "Local Geography." Take a shot of something in your
area that typifies the local geography. We're a pretty diverse group, and
I'd like to see a little something about where you ...

http://www.pbase.com/bret/image/46864136/original
Business is about to pick up!

"William Graham" <weg9@comcast.net> wrote in message news:...

saw that written on the Fuji blimp flying on coney island.
I guess it will be called FujiDigital soon.

There seem to be sites that pop up occassionally that have pdf-scans of
old nikon manuals.  I got my FE manual at one of these a while back.
I'm now looking for an sb-15 manual -- anyone have any pointers for me?
I know the mir.com.my site, but that doesn't print very well, and, i

After a lot of reading in this newsgroup and in the sites that are mostly
linked here (photo.net, photodo etc), I decided that the lens mentioned in
the subject line would be good for me (3.5-4.5).
I got lucky on ebay and bought one very cheap, less than one year old, and

This is ridiculous, imagine you're out shooting pic's and you take a
photograph that this or that corp. doesn't like and you end up being
threatened with legal action.
http://english.aljazeera.net/NR/exeres/1368F807-6F41-4C77-8785-EEFD71FAB4D4.htm

I've spent a few days going back and forth trying to find an answer to a
fairly simple question -- What will it take to bolt a MC Rubinar 500/5.6
lens onto my Nikon DSLR?  
I've found a lot of scattered information through judicious googling,

Tried eBay, KEH, Adorama and B&H. I kinna find one!
I've fallen in love with my F4 again, but I really would prefer it without
the MB-21. Does anyone know where one can buy these?

I have a 350d and a EF70-200 4L, and love the quality of the shots
I've taken with it.  I want to be able to zoom-in more though, and
hand-hold in low light, but I don't want to compromise too much on
image quality.  At first the EF75-300mm F4.0-5.6 IS sounded ideal, but