Hi,

I use an SBIG ST-7E with a 10" LX200 f/10, normally with a Meade f/3.3
reducer, without the spacer, for an effective focal ratio of f/4.6.

I have been reading about fine collimation, and trying to twist my ancient
carcass into unnatural positions worthy of a circus contortionist, trying to
do a fine collimation on my scope. I decided, after admitting to myself my
total inability to bend my body as required, to try using the CCD camera for
the fine collimation (the step where one puts a faint star in focus, and
sees if the diffraction rings are still concentric). It seemed to work
quite well--I could use 11th magnitude stars, which seemed to show the
desired picture very well. After a bit of adjustment, they all seem quite
uniform and round, with no "comet" effect, as the faintest stars used to
have.

Is this legitimate, or am I just fooling myself?

Thanks.

--Mark de Regt

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