Quote:
Originally Posted by naskies
The TSOAG9T2 appears to have a male T2 thread for the guide camera. The SBIG ST-i has a female 28mm (1.25" filter) thread. There are a few ways to get there:
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Yes, that's correct.
Quote:
Originally Posted by naskies
1. T2 to M28 adapter. Something like this or this should work - but you should double check with the sellers as I can't tell from the listings.
2. You could also use a T2 to C-mount adapter combined with a C-mount to 28mm adapter to attach your ST-i.
Note that you may potentially need a spacer for either your main camera (M48 mount) or your guide camera (T2 mount) depending upon how far away the respective focal planes are. |
It's the calculating the spacing/focal distance required that's doing my head in a bit.
Wrt the guide camera, it was the issue of the spacing that made me cosider the M48/T2 adaptor, plus the existing 2"/1.25" adapter I've got - I can move the camera up/down in this adapter to find the sweet spot for focus. I did read that some people need spacers or 1.25" extension tubes to get focus on their guide cameras.
Quote:
Originally Posted by naskies
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Yes, it's for the 6D. The pics of the OAG on the link I had in my previous post, don't show the removable connector that's on the camera side. This
link shows a different view of the connector (it's the widget on the right, of course). The upper part is inserted into the OAG and is held by the 3 pins around the outside. The connector I've got fits the smaller T Ring for the 6D, but I'd like to use the True 2.
I did some "desktop" fiddling (no chance to setup with scope recently thanks to weather) with the setup connected as so: camera -> true 2 -> hand held OAG near/against True 2 -> FR and this got very close to focusing - I may need another very small spacer, but it looked achievable. I hope this is a valid test and I haven't messed up my understanding/assumptions.
As I sort this out, I can see I've got another problem looming as well. The connection of this part of the imaging train to the focuser. It's a stock focuser and it has no threading on the camera side, so I can see I'll either have to get a tube to slot in, or do the focuser upgrade I'm fully expecting to have to do sometime...