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Old 14-09-2005, 07:13 PM
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iceman (Mike)
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Join Date: Sep 2004
Location: Gosford, NSW, Australia
Posts: 36,799
Quote:
1. on the back of the mirror cell on there is a small hole in the outter ring of the cell. Is this normal? I also noted that it can be seen when looking down in the tube, at the edge of the mirror. I am guessing this is by design as it seems to be a machined hole
Can you post a picture? If it's what I'm thinking, it helps you to align the mirror cell when putting it back in the OTA. That's normal.

Quote:
2. I ran my hand over the tube as i was examning the back and noted a slight dent above the altitude bearing, i then examined the other side and it was smooth. I am thinking this is a defect. Looking into the tube i could note if positioned correctly with a torch that there is a slight dent there. I am not certain if this was there when i got the scope or something that has happned since due to my noob handling. I noted also that the plastic alt bearing on that side was a bit groved, now this was not there when i got it. I think perhaps the teflon on the rocker is groving it..
Dings and dents are a normal part of handling a tube like that, you should see mine! It even has little bits of surface rust from neglect and very very (once!) irregular cleaning
And the alt bearing will get some grooves in it from the teflon pads, that's normal too. I guess you can just try to keep it clean from dust and grit to keep the alt motion as smooth as possible.

Quote:
Does the dent pose any effect on my viewing? It does not protruede over the mirror so i am not sure it will have any effect. What do you guys think.
There's quite a gap between the inside of the OTA and the mirror, about an inch on each side usually. So unless it's quite a severe dint that protrudes in an inch, you won't notice it and it will have zero effect on your viewing.
I have flocking on the inside of my tube that is peeling off in one spot and actually does protrude slightly into the light path, and I can see when I have a bright object defocussed all the way out - but when things are in focus, I can't see it at all.

Quote:
I am more nervious no w about removing the mirror given the possible dent i may have inadvertenly caused. Will removing the mirror void warranty? Does warranty cover dents and groves?
Don't be nervous - you've done nothing wrong. The small dent will cause no issues. I don't think removing the mirror will void the warranty, it's normal maintenance when you own a reflector. But I also don't know what you'd possibly claim warranty on unless the mirror suddenly cracked or the focuser snapped in two?
Warranty most certainly wouldn't cover dents - that's part of normal handling. They're not china dolls, they can take a bit of a bashing. Just be careful with the optics.

HTH
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