Telescope device to combine all spectrums of light.

I'm not sure what you mean! If you want to see a spectrum of a bright
star or the like, you need some sort of depressive element like a prism or
grating. If it is large, it can be placed in front of your objective lens.
Since the light from a point source is spread into a spectrum only bright
stars will show a reasonable spectrum. Learning Technologies Inc., sells an
inexpensive, fairly large thin film type holographic grating that you could
try. I think Edmund Scientific also has some. Precision gratings and
Objective prisms are rather expensive so are probably out of the question.
Rainbow Optics sells an eyepiece type Star Spectroscope, visual for $179 and
Visual/photo/ccd type for $229. See the ads in back issues of Sky &
Telescope magazine. Also try eBay. Here, most are reflection gratings and
are more difficult to set up than a transmission grating. You will need one
for the "visual region" of the spectrum.

Ed Majden - Meteor spectroscopist
http://members.shaw.ca/epmajden/index.htm


"David" wrote in message
om...
I am looking for a telescope filter or device that will filter and
combine all spectrums of light and then display in full color. Does
such a device exist? If so, where can I get one?

Thank you,

Dave

"Ed Majden" wrote in message .ca...
I'm not sure what you mean! If you want to see a spectrum of a bright
star or the like, you need some sort of depressive element like a prism or
grating. If it is large, it can be placed in front of your objective lens.
Since the light from a point source is spread into a spectrum only bright
stars will show a reasonable spectrum. Learning Technologies Inc., sells an
inexpensive, fairly large thin film type holographic grating that you could
try. I think Edmund Scientific also has some. Precision gratings and
Objective prisms are rather expensive so are probably out of the question.
Rainbow Optics sells an eyepiece type Star Spectroscope, visual for $179 and
Visual/photo/ccd type for $229. See the ads in back issues of Sky &
Telescope magazine. Also try eBay. Here, most are reflection gratings and
are more difficult to set up than a transmission grating. You will need one
for the "visual region" of the spectrum.

Ed Majden - Meteor spectroscopist
http://members.shaw.ca/epmajden/index.htm


"David" wrote in message
om...
I am looking for a telescope filter or device that will filter and
combine all spectrums of light and then display in full color. Does
such a device exist? If so, where can I get one?

Thank you,

Dave


I have taken the light from a telescope and separated it into four
different directions (Red, Blue, Green and Clear). Now what I am
trying to do is re-combine all four so that I have one image of all
four of the colors. Is it possible to do this with a mechanical device
or could I do this with software?

"David"
I have taken the light from a telescope and separated it into four
different directions (Red, Blue, Green and Clear). Now what I am
trying to do is re-combine all four so that I have one image of all
four of the colors. Is it possible to do this with a mechanical device
or could I do this with software?

How did you do this and why? If you mean taking photographs through
different colour filters this can be done on a computer by re-stacking the
images. CCD cameras do this. They have black and white ccd detectors. You
can do this with black and white film also. Famous astro photographer David
Malin in Australia does this. He re-combines the images with an enlarger.
If you take three exposure through different filters, Red, Green, Blue, you
can make a colour picture by recombining the images on a computer. You can
probably do this with Photo Shop or AIP4WIN which is astronomical imaging
software designed just for this purpose. This software with manual is
available from Willmann-Bell, Inc. There are other software packages that
will do this also like MIRA and MaxIm DL and the professional Linux based
software called IRAF..
Ed