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Photo Forum / Film Photography / Medium format / October 2003Flashbulbs
Does anyone here know the difference between a Number 2 and a Number 22 flash in terms of output? They appear to be roughly the same size, but the 22 seems to have more filaments in it than the 2. > Does anyone here know the difference between a Number 2 and a Number 22 flash > in terms of output? They appear to be roughly the same size, but the 22 seems > to have more filaments in it than the 2. http://flashbulbs.com/clearbulbs.htm > Does anyone here know the difference between a Number 2 and a Number 22 flash > in terms of output? They appear to be roughly the same size, but the 22 seems > to have more filaments in it than the 2. Burn length. #22 is for focal plane shutter, I believe. No. The 22 was a class M bulb. > > Does anyone here know the difference between a Number 2 and a Number 22 flash > > in terms of output? They appear to be roughly the same size, but the 22 seems > > to have more filaments in it than the 2. > > Burn length. #22 is for focal plane shutter, I believe. > No. The 22 was a class M bulb. > > kfritch@aol.com (KFritch) wrote in message [quoted text clipped - 6 lines] > > > > Burn length. #22 is for focal plane shutter, I believe. I'm thinking of #6 and #5? The bulbs for focal plane shutters are #6 and 26. I unerstand the 22, 40, and 5 can be used with focal plane shutters at speeds below a 30th. The Cress site is an excellent source for guide number and synch tables. It does not, however list the number 2 which I am asking about (or, for that matter, the number 8 which seems to have similar characteristics with the Press 25 except that it is smaller in size) > [...] It does not, however > list the number 2 which I am asking about (or, for that matter, the number 8 > which seems to have similar characteristics with the Press 25 except that it is > smaller in size) This is from their site. Is the Type 2 and #2 the same bulb? Type 2 (Class M) (2) Up to 1/30 150 220 300 420 600 850 1/60 130 190 260 380 550 750 1/125 110 160 220 320 460 650 1/250 85 130 180 260 360 500 1/500 70 100 140 200 280 400 I saw the type 2 also, but I've always known these bulbs as #2's and the ones I have are marked as number 2. The guide numbers look like they should be in the ballpark, but there have been so many differing nomenclatures used on some items, that I'm not positive they are the same hence my search for information on Number 2's. If it can be confirmed that Type 2 and Number 2 are the same beastie, fine otherwise I just keep looking. I suppose I could fire off a couple using the Type 2 guid number table and see if they work. > I saw the type 2 also, but I've always known these bulbs as #2's and > the ones I have are marked as number 2. The guide numbers look like > they should be in the ballpark, but there have been so many differing > nomenclatures [...] Yes it's confusing. I have cases of #50b, #40, 5, and some real oddballs. I'm not smart enough to noodle out a correlation between numbers and GN, if there is one. But - can't a flash meter tell you what the GN is? Set it 10' from the flash, boom, read? I've never really used a flash meter for that purpose. I suppose one could experiment first using a flash with known guide numbers and then shoot the flash with unknown guide numbers and work your computations that way. I'm not sure there's a film slow enough or an aperture small enough, though to cope with a Number 2 at 10 feet. I think there will have to be more of a stand off. > I've never really used a flash meter for that purpose. I suppose one could > experiment first using a flash with known guide numbers and then shoot the > flash with unknown guide numbers and work your computations that way. I'm not > sure there's a film slow enough or an aperture small enough, though to cope > with a Number 2 at 10 feet. I think there will have to be more of a stand off. I'll try it this evening with a couple #50s if I can find the ND filters to put over the flash meter. You forget that shutter speeds matter when using flashbulbs. > I've never really used a flash meter for that purpose. I suppose one could > experiment first using a flash with known guide numbers and then shoot the > flash with unknown guide numbers and work your computations that way. I'm not > sure there's a film slow enough or an aperture small enough, though to cope > with a Number 2 at 10 feet. I think there will have to be more of a stand off. Some meters can't read the extended duration of bulbs (or even certain electronic flash units with longer duration designs). I recall some of the older Weins being prone to this. Does anyone have any solid info on this? >> I saw the type 2 also, but I've always known these bulbs as #2's and >> the ones I have are marked as number 2. The guide numbers look like [quoted text clipped - 7 lines] >But - can't a flash meter tell you what the GN is? Set it 10' from the >flash, boom, read? > Some meters can't read the extended duration of bulbs (or even certain > electronic flash units with longer duration designs). I recall some > of the older Weins being prone to this. Does anyone have any solid > info on this? A definitive answer would be interesting, but I suspect that modern flash meters can handle the long duration. Some consider ambient light in their reading, so it appears they read total light that falls on the meter (peak power). Those triggered by a synch cord? Dunno! >The bulbs for focal plane shutters are #6 and 26. I unerstand the 22, 40, and >5 can be used with focal plane shutters at speeds below a 30th. The Cress site >is an excellent source for guide number and synch tables. It does not, however >list the number 2 which I am asking about (or, for that matter, the number 8 >which seems to have similar characteristics with the Press 25 except that it is >smaller in size) Another site with flash bulb info is: http://www.dhios.demon.co.uk/Flashbulbs/intro.html There isn't a lot of information about the #2, but it is listed. The #8 is listed and even has a picture.  SignatureMark Cudworth > The bulbs for focal plane shutters are #6 and 26. I unerstand the 22, 40, and > 5 can be used with focal plane shutters at speeds below a 30th. The Cress site > is an excellent source for guide number and synch tables. It does not, however > list the number 2 which I am asking about (or, for that matter, the number 8 > which seems to have similar characteristics with the Press 25 except that it is > smaller in size) Now I remember: 5 and 25 (M), 6 and 26 (FP) |
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