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[APML] My first letter for you: Hypering Chamber and Astrograph for Pentax 6x7
Hello everybody!
This is my first setter to this group, so I think it will be in order if
I present myself first - just briefly, even though this is one of my
favorite subjects.
My name is Jens Christian Sorensen, and I am a Dane living in Malaga,
Spain. I have been studying astronomy since somewhere around 1980, and
am the prod owner of a self constructed Newton/Dobson, which I have
mounted on an equatorial platform. The Newton is a 10 inch, F6, and
build after the book "The Dobsonnian Telescope". I am quit happy with
it, and have started to make some Piggyback photos - my most challenging
photo - horse head with a 400 mm F5,6 lens, using Fuji Provia 400F. I
like it too.
Anyway, the questions that I have are related to astro-photography are:
I would like to make myself a hypering chamber. I have been looking
around on the Internet, and have been able to find very little on the
subject. Only recently I saw a message and a website over a PVC
container for storing the hypered film. I do not think I will have any
problem making the container - inox and some fittings - this should do
it. The problem is with the vacuum pump - the cheapest that I have been
able to find cost about 400 Euro ( 1$=1euro). It can get down to 0.15
millibar though. Also the gas could be a problem. I have only been able
to locate a mix, containing 95% Nitrogen and 5% Hydrogen.
Last year I became the proud owner of a Pentax 6x7, which came with a
105mm and a 165 mm lens. The last one is definitely the best. I would
like to take the camera further though. Having gone though the lenses
and the prices that I have been able to find at KEH, I would like to see
if I could make my own "astrograph" for the camera. I have been
tinkering some bit with a Newton configuration; 200mm (that is 8 inches
for you guys), at F4,5 or something. But, I would like to hear what
others have done with this problem.
Well, for now this is it, and thank you for all your input.
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