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Strange image in Skywatcher Evostar 150 ED Mirror

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#1 bluesilver

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Posted 14 August 2020 - 11:51 PM

Hi,  Sorry for double posting on here,  I think i put my first post in the wrong section,  apologise for this.

 

I am hoping someone on here might be able to help or advise what this image is that i am seeing through my scope.

I have just got a delivery of a brand new Skywatcher Evostar 150 ED
I was just going about a few things checking it out.
I am completely new to these scope as i have always been using a Dobsonian.

I put a diagonal on and had a quick look through it and found what i thought was a smudge mark,
Thinking it was in the diagonal i tool it off but that was clear.
Then just looking straight through the scope i could still see it.
Thinking it was something on the front of the lens, had a look but all clear.
It appears to be inside of the scope.
I have attached a photo of it in the hope someone might be able to tell me what it is before i contact the company i purchased it off in Australia.
( Sorry first time at trying to attach an image on here )

To help explain the image a bit, the grey is just a background to help show the defect in question.
What i am asking about is the triangles that you can see,
What are they?
Is this normal?
Is there an issue with the scope that i need to send it back?

 

Capture.JPG



#2 stevew

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Posted 15 August 2020 - 12:34 AM

The two triangles are reflections in the two lenses. You took the picture at an angle. Try it under the stars and find out how it performs. 



#3 bluesilver

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Posted 15 August 2020 - 01:00 AM

Thanks for the reply,

So if that is the image of the two lens,  dose this now point to it being out of collimation?

I have just taken the photo while it was pointing at a grey background to show up the image i was talking about.

I found if i move the scope around in the shed here,  the image still appears to be there,  just shows up more on the light grey background.

I wasn't too sure if there is a defect and has to be sent back,  I would have no idea on collimation on these scopes,  use to Dobsonians.



#4 Tapio

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Posted 15 August 2020 - 01:16 AM

Like Steve said, test with stars how they look.



#5 eyespy

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Posted 15 August 2020 - 11:19 AM

Hi Bluesilver,

 

Looks like a double reflection of a skylight above you.  The reflections are different due to the different lens curvatures giving different scaled reflections.  The 'colours' are different due to how the coatings react to the light and lens curvatures.

 

Doug.....




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