CHAPTER 7. APPENDIX
bayer matrix effect...), using a DSLR camera makes
astronomical spectroscopy accessible with a low bud-
get. How to use a DSLR camera with the Alpy 600 is
described in section 7.2 below.
7.1.4 C-mount camera adapter
Most CCD cameras are today using T-mount thread
(M42 x 0.75mm). But there is also a large range of
compact CCD cameras which use a C-mount thread
instead (1” diameter). Some of them can be used with
Alpy 600 thanks to the optional C-mount camera adapter
- just keep in mind the CCD size, which must be at
least 8.5mm to get the full spectrum.
The C -mount adapter replaces the main T-mount
adapter of the Alpy 600:
7.1.5 Optical fiber adapter
Alpy 600 can be used with a fiber optics. The opti-
cal fiber adapter has a Type-FC connector:
7.2 Alpy 600 with a DSLR camera
Your Alpy 600 can be used with a DSLR camera.
A lot of people today have such a camera at home,
and it allows you to start in spectroscopy with a low
investment. Because of the long backfocus of DSLR
cameras, you must add the barlow adapter. In the
nominal configuration, the spectrum length is about
18mm (it is 6mm without the barlow). Since pixels
are usually small in a DSLR camera (5-6µm range),
the spectrum is over-sampled.
Installing the DSLR camera barlow adapter
The DSLR camera barlow adapter is mounted on
the back of the Alpy 600. If necessary, remove the
main ring for better access to the thread. Make sure
to tighten it firmly:
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