[MF3D.FORUM:1473] Re: NSA MF slide show

["David W. Kesner" <drdave@xxxxxxxxxx>]

Dick Twitchell writes:

> whatever... OK if you want a number, one to one hundred.  (  :-)  )

Only one hundred? I was thinking about 250 *{;-)

> How does that compare with #5 or #25 bulbs?

Are you asking about cost or GN? You can get these for a wide 
range of prices as they are no longer made and must be bought 
at yard sales and such. Never pay more than a quarter for one. 
A box of 12 should only be a couple bucks. As for the GN that 
depends on the flash refelctor being used. The solid polished 
ones give the highest and the folding fan gives about one to 
one and a ahlf stop lower. In feet at ASA 100 you can get a GN 
of about 140-180. Bulbs such as the M3 have the same output, 
but are much smaller in physical size. this makes them real 
popular with cavers who are concerned about size and weight.

Just in case anyone is not aware, the clear bulbs are for B&W 
and the blue bulbs are for color film. You can apply a blue 
filter to either the camera lens or cover the flash to use 
clear bulbs for color. You can also make your own shelac and 
coat clear bulbs. Many formulas on the net.

David W. Kesner
Boise, Idaho, USA
drdave@xxxxxxxxxx