Moving the mirror on the SkyWatcher 130M

My SkyWatcher 130M telescope needs a little help to reach prime focus with a DSLR camera (see also this great blog post). So I decided to move the primary mirror up the tube to allow my Canon EOS to reach focus when attached directly to the T-ring for prime focus astrophotography. This involved almost completely dis-assemblying it, playing with new nuts and bolts, then putting it back together.

I started by removing the spider and secondary mirror assembly, which are held by four recessed screws and nuts on the inside (which should not be dropped onto the primary mirror):

Four screws hold the SkyWatcher 130M spider

SkyWatcher 130M (SK1309EQ2) secondary mirror

Installing Canon EOS Utility on Mac without the CD

My second hand Canon EOS 1000D has arrived (intended for astrophotography), but without the manual or software CD. Canon provide this stuff to download on their website which is great, except that the software is intended only to update an existing installation originally made from the CD-ROM. That seems stupid on many levels - the only people interested in using this software will have a Canon camera. Practically speaking, I have neither the Canon CD-ROM, nor in fact even a CD-ROM drive. Apple don't believe in them any more ;)

Fortunately enterprising people have worked out how to hack the Canon software to install without the CD-ROM, both on Windows (e.g. here) and on Mac OS X. Canon don't support Linux.

SkyWatcher Explorer 130M with Canon EOS (Take 2)

I borrowed a Canon EOS 1000D for the weekend, and was lucky to get some clear sky both on Friday and again tonight (Sunday). On Friday I was mostly working out focus travel issues, what modifications might be needed, and how to get any heavenly bodies in focus. Tonight I tried a planet, the moon, and some stars.

SkyWatcher Explorer 130M with Canon EOS DSLR

This weekend I borrowed a Canon EOS 1000D to try out for prime-focus astrophotography when connected directly to my SkyWatcher Explorer 130M (SK1309EQ2) telescope using a T-ring adapter.

Moon using Canon EOS 1000D, held at prime-focus with
SkyWatcher Explorer 130M telescope (SK1309EQ2).
Single exposure, no cropping, no editing.

As well as doing a lot of reading on assorted astronomy forums, I found this excellent blog post about using a (digital) SLR with the SkyWatcher Explorer 130M telescope very helpful, and this page on taking the SkyWatcher focuser apart was informative: The challenge is getting enough inwards focus travel.