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Anonymous
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Hello all,
Ive got a roll of black & white 3200 speed film id like to use in my SLR piggy backed on my scope and am at a loss as to how long an exposure I can get away with on a DSO like Andromedia in a dark sky area away from light pollution. I imagine its quite a grainy film but its fast and i have to use it up anyway. Does anyone have any guesses on exposure times? Im planning on using my telephoto lens on it, (70-210mm manual focus) and also some prime focus as well. Ive had good luck using 200 and 400 color speed films but never tried a film of this speed before for anything, all inputs would be greatly app, I have no plans to even attempt any planets or the moon with it as im sure they would be too grainy even at very hi shutter speeds. Dave 
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Anonymous
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MWM,
I have used 3200 B&W for many years. Yes it is a grainy film, but that is only one pain in the a__ when using this film. It is very easy to over expose your shots with this film. I could give you exposure times to work with, but I need to know the f-ratio of your lens first, and do you live in a light polluted area?
Don
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Anonymous
Unregistered
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Hi Don,
I was planning to go out to the dark countryside to do my photography. I have a f3.9 210mm zoom lens I can use on my Pentax SLR 1000 and I could also do prime focus thru my 8" Schmidt which is f10. I could also just use the standard 50mm lens that came with the SLR and close iris a stop or two, same for the zoom as im sure it would show abberations otherwise. What do you recommend I shoot with this film? I was thinking M31 & M57? Dave
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Anonymous
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MWM,
First, I started out with a K-1000, back in the 70's and it still works to this very day. Seeing how you only have one roll to use, I would shoot some at prime and some biggyback. M31 with its bright center will show some over exposure in that area with this film. B&W film at this speed is very touchy and will over-expose on bright object very fast. With M31 and your 210mm lens start out at 5min. with your first shot and move up to 10min. I have found that at 10min and above with a 210mm lens, that over-exposure starts to show in the brighter areas of the object your shooting. At prime focus with your 8" SCT on M31, start out at 10min and move up to 20min. When shooting prime, over-exposure is very easy on M31 with 3200 ASA B&W film. M57 is more evenly illuminated and will not over-expose as easy. For M57 start out at 4min and work up to 8min. I will try and post some of the photos I have taken with 3200 B&W film. The only B&W film I use now is TMax 400.
Don
Edited by DonR (09/19/03 12:39 AM)
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Paulimer
member
Reged: 08/08/03
Posts: 54
Loc: Hong Kong
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I would also like to try on Tmax400 B&W. Can you please give some comments on this film? Thanx.
Paul
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The sky is like a fantasy: http://paulimer.sinastarz.com/
My astroblog: http://astropaul.blogspot.com/
Celstron 5" SCT
Vixen 4" F10 Newtonian
Mizar NewAR
Takahashi FS60C
Takahashi Sky90
Takahashi EM11 USD3
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Anonymous
Unregistered
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Thanks Don,
Ill try the exposure times you stated. Yes, id like to see any pics you have if you have the time and desire to post em. Ive got several 400 speed color rolls around and that was the speed i was going to stick with too myself. Wish I could go CCD like the rest of the world but, with having to pack up and haul all my equipment out to darkskys I cant see adding all the cables, laptop, and a power source on top of the kitchen sink I already carry out. Almost too much already. Dave
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Anonymous
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Paul,
Tmax 400 is a very good all around film. I have used it for deep sky and some planet shots. Do you do prime focus or biggyback ?
Don
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Anonymous
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Don,
Ive mostly done piggy backed tracking of comets which dont come around often so it isnt often that I even do it. Most of my photography interests are of unusual items that havent been done recently like comets. Everything else has already been done a gazillion times so I dont want to do the existing messier stuff except as an exp of the fast film as an experiment. I am considering shooting Jupiter and Saturn at prime focus tho and thats where my sudden interests are at right now since I have a decent telescope finally that would do the effort justice. Ive done a lot of fixed tripod astropics in the past but they all were under 1 min to avoid star drift.I certainly didnt have to worry about sky fog back then, hehehe..............Dave
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Anonymous
Unregistered
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MWM,
Do you have a type of film you will be using for Jupiter and Saturn ? I use ASA 200 and 400 for planetary objects. For color film I use a film to match the color of the object. What I mean, is that if it is M42 I will use a red sensitive film, and if it is a nebula like M27 I will use a blue and red sensitive film. For galaxies I at prime focus, I have had very good luck with Fuji Superia X-TRA 800. The nice thing about Superia X-TRA 800, is that it is not that grainy.
Don
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Anonymous
Unregistered
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Hmmm I hadnt really considered that Don, but its good to know in advance. Im about as amature to astrophotography as it gets when choosing films other than just 200-400 speed color. Being self employed I barely have time to even get out to play much these days or should I say nites? Seems like I always have to work the next day on the good seeing nites go figure! Dave
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Paulimer
member
Reged: 08/08/03
Posts: 54
Loc: Hong Kong
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Don,
I'm a beginner in deepsky imaging. I'm doing prime focus w/Sky90, using E200 usually, but suddenly had the thought in using B&W film~
Paul
--------------------
The sky is like a fantasy: http://paulimer.sinastarz.com/
My astroblog: http://astropaul.blogspot.com/
Celstron 5" SCT
Vixen 4" F10 Newtonian
Mizar NewAR
Takahashi FS60C
Takahashi Sky90
Takahashi EM11 USD3
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Anonymous
Unregistered
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Paul,
After a few good rolls of pics, you will see that B&W film when used on certain objects, will show more detail than color film.
Don
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Anonymous
Unregistered
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I was looking through this and had a thought - has anyone tried the kodak chromogenic b&W for astrophotography? one is called portra, one just b&W, all iso 400, but they say they have amazing exposure latitude. And it's developed as c41. I've shot a few rolls in daylight, and I love the results.
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