My new 200p Dob

[awlfc]

Next to the small circle in the mirror I have a strange mark it looks like the mirror is fiber. I have attached an image could anyone tell me if this is right.

Thanks

[CraigT82]

Has your centre mark doughnut come loose? 

[Ricochet]

The doughnut should be in the centre of the mirror. Unless it is some strange reflection it is nowhere near the centre and needs to be recentred. To do this you will have to remove the primary mirror cell from the bottom of the OTA, carefully remove the doughnut from its current position without scratching the mirror, accurately replace the doughnut, reattach the mirror cell and finally collimate the telescope. Given that this is a new telescope you will probably want to contact your supplier and get them to fix or replace the telescope. 

[awlfc]

The doughnut looks to be centre when I look down the scope. It's the small smudge  next to the doughnut im concerned about . I'm going to use low pressure  blast of air to see if it's just  dust or junk from the factory 

[cletrac1922]

Would not touch it

If a bit of dust will not impede your viewing

You have flex or solid tube Dob

For solar viewing, the hard plastic cover, has a small detachable cap

Sticky tape some visual badder film, under side of the detachable cap, and leaving off spotting scope, then can do solar viewing

 

Next year, NASA is sending another rover to Mars

The attached link, you are able to register, and have your name included on the rover

Also able to download a Boarding Pass

Share around with family and friends

https://mars.nasa.gov/news/8440/nasa-invites-public-to-submit-names-to-fly-aboard-next-mars-rover/

 

 

John

Edited June 11, 2019 by cletrac1922

[awlfc]

I have the solid tube. It appears to have been a bit of glue or somthing put low pressure air near it and it dislodged 

[JOC]

How have you taken the photo then, the doughnut doesn't look central in the shot and that might affect your viewing if things are misaligned.

[ronl]

It looks like it has been taken from down the tube, the camera is off centre,

if it was taken from the focus tube then it would show the doughnut in it's

central position.

[awlfc]

I just positioned the camera in an angle to see down the tube. The doughnut looks centre by eye. 

[Tomatobro]

No light gets to the black ring as its covered by the secondary mirror so I would leave the dust where it is.

[awlfc]

I have removed it now and mirror looks very clean. Just need the clouds to foxtrot oscar so I can use the thing.