Where do I fit the 2" filter?

[poogle]

I've just recieved my 2" Baader Neodymium filter which I intend to use to fight light pollution in Stockholm and be able to aquire longer exposures for my astrophotos.

However there seems to be a slight problem, it doesn't fit anywhere

I have a standard t-ring that I connect to my telescope (a SkyWatcher 150P with a 2" focuser and the stock adapter that fits in the focuser) but I can't find any 2" filter threads. Am I blind or do I need anything else for this to work?

I'm also thinking of getting myself a Baader coma corrector, willI be able to screw my filter onto that and just slide the coma corrector into the focuser?

[Mzungu]

it should screw into the bottom of your 2" EP shouldnt it...?

[poogle]

Well, I don't own any 2" eyepieces My thought was to use the filter for astrophotography only

[studdedsole]

Well, I don't own any 2" eyepieces My thought was to use the filter for astrophotography only

I believe it should screw onto the front of the nose piece you will use to slide the camera into the telescope focuser if this is 2"

[Black Knight]

A 2" filter will screw into the end of a Skywatcher coma corrector. I believe this is also true of a Baader coma corrector.

[studdedsole]

http://www.firstlightoptics.com/adaptors/flo-2-inch-t-mount-camera-adapter.html

or something like this which screws into the T ring and has the 2" filter thread at the opposite end

[Black Knight]

http://www.firstligh...ra-adapter.html

or something like this which screws into the T ring and has the 2" filter thread at the opposite end

Yes indeed. The problem with that approach is that many newts cannot achieve focus using a DSLR and a conventional T ring / nosepiece arrangement. On Skywatcher newts (I can't comment on other vendors), the T ring is supposed to screw directly onto the focuser using a T thread. In this configuration there is nowhere to attach a 2" filter to.

[poogle]

Thanks guys. I guess I need that coma corrector then (or another nosepiece)...and hopefully Ill achieve focus with that setup aswell

[studdedsole]

Yes indeed. The problem with that approach is that many newts cannot achieve focus using a DSLR and a conventional T ring / nosepiece arrangement. On Skywatcher newts (I can't comment on other vendors), the T ring is supposed to screw directly onto the focuser using a T thread. In this configuration there is nowhere to attach a 2" filter to.

Ah, good point don't know the extra 4mm length in the optical path as a result of the adapter will prove the bug bear.

[Black Knight]

Ah, good point don't know the extra 4mm length in the optical path as a result of the adapter will prove the bug bear.

On my Skywatcher 200P I tried both a 1.25" and a 2" nosepiece, neither would let me achieve focus with a DSLR and T ring. A barlow lens would work, as would moving the primary up the OTA. But the recommended solution is to simply unscrew the 1.25" eyepiece holder and attach a normal T ring to the resulting T thread. Job done! . But no 2" filter thread available ....

[poogle]

I have about 10 mm to spare in inward focus with my DSLR, but I found a thread on another forum stating that the Baader Coma Corrector extends the focal plane back about 10mm (I guess the focal ratio will change aswell).

I think I'll have a go with that approach since it also looks like the MPCC has 2" filter threads