skywatcher 250px photography

[superjody]

i have 2 adaptors for a dslr, one is the deluxe barlow and one is a celestron adaptor with no magnification.

the barlow i can get to focus but the celestron one wont, is this right??

i thought the focus issues were with the smaller scopes like the 130

thanks

[steppenwolf]

Sadly, this can be an issue with some of the larger SW Reflectors as well if you are not using the correct adapter. You should be able to get focus using a standard 'T' adapter that attaches directly to focus tube but you may not achieve focus using a 1.25" or 2" nosepiece 'T' adapter.

[superjody]

ah [removed word] ha ha, will the t adaptor go straight onto the 2" fitting or will i need a seperate one?

[steppenwolf]

Do you have a Crayford focuser or a rack and pinion like mine? A standard 'T' will not screw onto a 2" fitting as it is only 42mm diameter against the 50.2 of the 2 inch.

[superjody]

is the crayford the one in the picture???

mine is the rack and pinion if it is, the one with the all black focus wheels

[Glider]

Hi, I'm going through the same exercise. What have you got there that fits between the camera and the barrel of the R&P focuser. The end of the focuser is about 58mm isn't it?

[steppenwolf]

The one in the picyure is the R & P so you have a Crayford which should be a lower profile. What does the Celestron adapter look like?

What have you got there that fits between the camera and the barrel of the R&P focuser. The end of the focuser is about 58mm isn't it?

With the R & P, Skywatcher supply a 58mm to 1.25" EP adapter but if you unscrew the 1.25" adapter, you are left with an expose 'male' 'T' thread and that is what I am attached to.

[Glider]

What's that like for vignetting, Ive tried that arrangement and it was pretty bad for me.

[steppenwolf]

These days I use an APS sized sensor CCD camera and the attachment for that is purely 42mm so I suspect that any vignetting is more optical than obstruction based.

[superjody]

The one in the picyure is the R & P so you have a Crayford which should be a lower profile. What does the Celestron adapter look like?

With the R & P, Skywatcher supply a 58mm to 1.25" EP adapter but if you unscrew the 1.25" adapter, you are left with an expose 'male' 'T' thread and that is what I am attached to.

the celestron adaptor looks like a barlow lens but hollow inside

[steppenwolf]

the celestron adaptor looks like a barlow lens but hollow inside

I think you will struggle to focus with that as I suspect the camera will be too far from the focus tube. What is the inside diameter of the connector directly on the end of the focus tube - is it by any chance 2" (50.2mm)? If it is then an Olympus 'T' adapter and a 'Revelation T Adapter 2" should resolve the issue.

[superjody]

yeh its 2", think il look into one of those....cheers

[superjody]

i took off the 2" adaptor and put the camera up to the scope and got focus with it so it looks like il be getting one of those adaptors

heres the pic i got

[steppenwolf]

Wonderful - that looks just right - well caught!