Re [APML] Deep field photo of NGC7000 and Pelican nebula

["TEIVA LEROI" <leroiteiva@minitel.net>]

Thanks Hern,
I need dry air injections in my 6x7 camera but a Vacuum back also.
The vacuum back is too difficult with my camera (if it was a pentax 67, 
it will be more easy).

BUT....I make a test this week with a 120 film size,  but without the 
"paper backing" (behind the film) and with a 220 back.
I saw that with a 120 film without its "paper" (it is like a 220 film) 
the film is completely flat.(I just saw that with my eyes, I didn't make
 a photo test: maybe next week)
Teiva

http://www.astrosurf.com/leroi





>You have to use dry air or nitrogen gas injections with these setups.. 
your
>NAN deep exposure shows what looks like a bit of film creep near the 
top
>edges.. it will even be worse if you use hypered film.
>
>"TEIVA LEROI" <leroiteiva@minitel.net>  wrote:
>
>>very pointed. I have some big problems with film curling during the 
>>exposure. Somebody told me the best camera was the pentax 6x7 but it 
is 
>>too expensive.
>>If somebody has an idea against this curling (because the vacuum back 
is
>>too difficult to make)???
>
>Herm
>Astropics http://home.att.net/~hermperez
>
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