DSLR Does anyone have a picture of how they attach to scope

[jmfdiver]

Hi

I have a skywatcher 200p Newt and a Canon 550d. I have the fitting for the camera. When I attached it straight to the scope I was unable to achieve focus. I have another fitting but I am unsure of what is best. If anyone has a photo or can take a photo of how they are attaching their dslr's to their scope I would be grateful.

Jen

[Stephen]

Which adaptor are you using?

The DSLR to 2" push fit

or

The DSLR to T-thread scerw on

Focusing a DSLR on a 200p (with standard HUGE focuser) is difficult. You won't get it with the push fit (unless you have a barlow in the chain.

The T-thread might just come to come focus, I'm afraid I can't remember.

I now have a low profile focuser (and I've also moved the primary up the tube for other reasons,) so I don't have the problem.

[Merlin66]

Sometimes there's not enough clearance to get the DSLR to focus...it needs 55mm beyond the focuser body...

You may have to move the main mirror up the tube slightly or change to a low profile focuser.

HTH

[jmfdiver]

These are the various bits I have.

Jen

[Stephen]

If you try just the bottom bit (Canon T-thread) directly onto the focuser (the 1.25" barrel will unscrew to reveal a t-thread) and let us know if that will focus.

[hemihaggis]

yep the bottm bit will work if you have a thread to screw into on the focuser , if not you will need a shorter extension (like the tube on top right ) but about 1 or 2 inches maximum lenght , the tube you have would work in a mak or sct ,where they need a longer lenght from the camera chip to focus , newts on the ohter hand need a short distance from the chip to focus .

[jmfdiver]

Ok so I had just the bottom one on so therefore I assume I need to move the primary up the tube toward the focuser? I will still be able to collimate like that?

Jen

[Stephen]

Ok so I had just the bottom one on so therefore I assume I need to move the primary up the tube toward the focuser? I will still be able to collimate like that?

Jen

That's option 1, or option 2 is the low profile focuser (about £70 for the cheapest option.)

Yes, you can still collimate moving the primary. The easiest way to do this is to replace the rubber o-rings in the cell assembly with some strong springs and longer locking / collimation bolts.

[Stephen]

It's not a guide, but here's mine

http://stargazerslounge.com/equipment-discussions-help-telescopes-whole-setups/148344-replacement-mirror-cell.html#post1880554

I don't find I need locking bolts any more as the collimation (the reason why I did this in the first place) holds really, REALLY well

[jmfdiver]

hmmm looks like a low profile focuser then, but I was able to get orion nebula last year. Would that be because it's fairly large and relativly closer than M31?

Jen

[Stephen]

hmmm looks like a low profile focuser then, but I was able to get orion nebula last year. Would that be because it's fairly large and relativly closer than M31?

Jen

Are you focusing on nearby stars with a Bahtinov mask?

[Merlin66]

No, all these objects are basically at the same distance....infinity!

You must be pretty close to achieving focus - something may have moved a couple of mm and you're now out of focus??

[jmfdiver]

@ Kh3dlar

I already put the washer in the secondary holder. That metal is soft.

Jen

[wackyscot]

I bought one of these, gives extra aperture and screws right into the focussing barrel. also threaded for filters. Fits my C8 fine. Clever Engineering - Low Profile M60 to T Mount Adapter Look at the website and it shows how to attach etc, very cool piece of kit

David

[jmfdiver]

I need to purchase bahtinov mask. I didn't want to mess with the collimation too much as I was waiting for Jupiter to come into view for webcam image. I will now have a go with my current setup and the dslr and see if I can achieve focus before I spend more money. Austerity measures in place!

Jen

[jmfdiver]

David that looks interesting.

Jen

[Ptarmigan]

I was able to get orion nebula last year.

something may have moved a couple of mm and you're now out of focus??

Orion =winter =low temp =contraction in metal parts ,,, I wonder ??

What is the tube made of ?

[wackyscot]

David that looks interesting.

Jen

Yeah Jen, it gives a small increase in aperture also which is always good, less vignetting. Just leave it attached to the T-mount and click your cam on it, saves a lot of time mucking around etc.

David