First attempt at Orion... Help needed

[D33P]

Hi everyone,

Now, let me start by saying that I know there is a LOT wrong with this... but I'm a noob after all 

I know the focus is a bit off, mount could be better aligned, processing is questionable, oh, and that big orange blob!

All of these issues I can work on (the 'blob' is caused by external light getting onto the sensor as I don't yet have a t-ring for my camera and it was just poked against the end of the telescope)

The one thing I'm not sure how to resolve is those arching rings.

I see them when using an eyepiece too, so I'm guessing they are something to do with the scope.

What are they?

What causes them?

How can I get rid of them?

 

Thanks for taking the time to read my post

James

 

Equipment used:

Celestron 127 XLT

Celestron CG-4

Canon 450d

Luck

[StargeezerTim]

Lucky horseshoes! Lol...

When you attach the camera properly to the focuser, you might find the problem disappears....

[rubecula]

Despite the problems it's a good image of the Orion Nebula especially for a hand held shot.

I guess the arches are some form of internal reflection.  I'm not familiar with your kit, but it might pay to check that all internal surfaces are a dull black finish, especially around any joints/threads.

[MARS1960]

Jesus that is awesome, how on earth did you manage to get so much detail handheld? i couldnt possibly hand hold against the scope long enough.

Was that a long single sub or lots of short exposures? its way better than i'm getting with the camera attached, well done .

[happy-kat]

If you are into DIY you might find this read I came across yesterday interesting re internal reflections

[D33P]

Crikey! No, not handheld. 

If my hands were that steady I wouldn't need a tripod... Just pick up scope and point at sky, would save loads of time 

The camera was attached to the scope with an afocal bracket. My new (used) camera arrived before the t-ring, but I couldn't wait to try it!

The image is made of 8x60sec subs (is that what you call them?), a couple of of darks and stacked in DSS. Then tweaked in PS

 

James

 

[D33P]

12 minutes ago, happy-kat said:

If you are into DIY you might find this read I came across yesterday interesting re internal reflections

I can't see a link. Maybe because I'm on my phone not on my computer. 

I think it is indeed something to do with internal reflections. After doing a bit of searching and reading it seems it's a common problem with SCT's. 

I'm seriously considering flocking inside the tube, secondary baffle, and the exit baffle. 

Even though I consider myself pretty handy, opening up my scope is quite a daunting thought! 

 

James 

[happy-kat]

no it is not you I keep forgetting I must use the embeded link tool

link here

[D33P]

Thanks, I'll have a read when I get home