NGC 7000 H-alpha using a 100mm Canon lens - second light

[Avdhoeven]

Next week I go on holidays to Austria and I didn't want to take my telescope, so I decided to go for something different. I bought a geoptik adapter to attach a Canon lens to my SXV-H9 ccd. I also bought a Canon f2.0 100mm lens to start making widefields...

This night I made my first test at home of the setup. It consists of the SXV-H9 with the canon lens on an EQ6 mount without any autoguiding or other steering during the imaging.

I made images of 300s with my H-alpha filter (4,5nm) with the Canon lens at F2.8 (using a round ring in front of the lens). I noticed severe deformation of stars in the corners so I decided to go for f4.0 in the future, because I noticed the deformation almost completely disappears then. Then I need 10 min exposures, but without autoguiding and a good polar alignment it showed not to be a problem at all. Even 20 minutes is possible as far as I can see now. The final result was astonishing for me, I even see the trunks in the pelican nebula... I will certainly go making more images with this setup...

Exposure: 15x300s Ha at 100mm F2.8 and 1x600s Ha (4,5nm) at F4.0 - OIII and S2 I will make next time.

And here some images of the huge scope (it's less then 25 cm long...)

[farunj]

That's come out really well, though as you say the stars are a bit deformed in the corner!!

[Uranium235]

Good work, that NEQ6 makes the the lens and camera look like the size of a flea!

Did you try anywhere around f3.5? I guess you could do do with more subs @ F4 to fix those stars in the bottom left corner, the others are fine as far as i can see.