Messier 13 via Celestron C8 & Canon EOS 450D

[EA2007]

Object: M13

Scope: Celestron C8 Schmidt Cassegrain @ F/12

Mount: (N)EQ6 Pro

Camera: Unguided stock Canon EOS 450D

Settings: 9 x 30 Secs (5 @ ISO1600, 4 @ ISO800) No darks/flats

Processing: Stacked in Deep Sky Stacker, adjusted in IrfanView

Think my scope needs collimating and balancing properly. First real attempt at stacking more than 2 images of this object : )

[greenkat]

Nice one EA

[EA2007]

why thankyou : p

[jgs001]

Very nicely done, and much better colours than I managed with my kit last night.

[EA2007]

Thanks,

I am liking the amount of colour it picks up, I still need to address the focusing issue and the alignment but that will come with time.

May purchase a focal reducer...any ideas on where to get one for cheap / any ideas on where to get a good one?

[Psychobilly]

The Celestron or Meade f6.3 ones are ok.. If we ever get a run of decent skies again I might finally get round to tuning the spacing...

You will need around 55mm of extra spacing between the FR and the T adaptor on the camera...

Forget the F3.3 one for DSLR's...

If you want to pay more there are some tasty FR's out there...

Peter...

[EA2007]

Thanks Peter,

what do you mean by 'spacing' ? excuse my lack of knowledge

[Psychobilly]

The focal reducer will screw onto the SCT port and then you need 110mm between it and the sensor in the camera 55mm of this comes from the camera body and the EOS T ring the other 55mm being the SCT -T adaptor ...

Peter...

[EA2007]

ah okay, thanks for that.

I assume the focusing will still be okay? I know that on my 8inch Newt. I can't focus it as there isn't enough downtravel on the focusing housing.

[Psychobilly]

Would be suprised if you had any issues with an SCT .... thats what these reducers are "designed" for...