111 replies to this topic

[urke]

Hello!

I recently received a "big box" with Orion Optics 200 f4.5 de-luxe OTA in it.
2" crayford, 50mm finder scope, rings, 1/6PV optics,..

Here are the pics:

1. OTA

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[urke]

2. Focuser

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[urke]

3. Focuser (the focuser's tube is not black as it is on OOs site: http://www.orionopti...mountspage.html )

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[urke]

4. 2"->1.25" ordinary adapter

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[urke]

5. Another look at focuser's tube

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[urke]

6. deep inside, maybe i'll have to cut that (AP, focusing with DSLR)

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[urke]

7. Primary mirror, i should check if center mark in really in dead center

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[urke]

8. Wait, i see something... let me refocus camera....
oooh, scratches, nice

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[urke]

9. Another look at mirror

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[urke]

10. ok

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[urke]

11. Zygo (no signature)

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[urke]

12. OTA (again) closed back

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[urke]

Large photos of primary mirror:

http://shrani.si/f/2...qh/dsc01859.jpg
http://shrani.si/f/3...Ya/dsc01864.jpg

Secondary mirror seems to be just fine, except some particles of dust

[F.Meiresonne]

Nice scope, like mine allmost.

I removed the mirrorclips and glued the mirror on to the cell with TEC7.

I choose a smaller secondary for that scope. That implied i had to put the mirror backwards as the smaller sec stopped the scope down.
My fully illuminated field is still small but for visual observing it is not important.
I like it very much.
How is the focusser? Seems a lot better then mine.

Congrats on the scope

[urke]

Now the Q:
Are those "scratches" normal for that quality (1/6PV, hi-lux coatings,..)? What experience do You have?
What causes those?-issue with process making the mirror, alu., coatings?
Is this what I payed for?

Thank you

[urke]

Thanx Freddy
I also plan to remove clips, but not for now.
Focuser seems to be fine, it's very "low profile", have to determine where the focus for DSLR is. (thinkig of focuser's 2" tube replacement for shorterr one-or just cutting the original one)
Im thinking replacing secondary in case of planetary imaging.
How did you moved prime back? Just with colim. screws?

[F.Meiresonne]

No, those scratches are not normal. I guess they will not influence the view much but mine came absolutely without any scratches.
Several months ago i saw another mirror of OO with a scratch...
Hows the focusser? Mine was badly drilled and one screw was (is) lose. Eventually i could tune it and it works fine now but it is no powerlifter.STill it moves smooth
My JMI EV3 on my obsession is much stronger though.
Is that the value of 0.119 wave i see on the report? What's the strehl value? That mirror seems better then the 1/6 pv wave

[F.Meiresonne]

I remove the nylon bolts on wich the prim rest. I removed the springs and replaced them with smaller ones (allthough theone installed are better) .I also drilled new holes in the backplate just near the edge.
All those minor changes made i could move the prim about 1 inch backwards. Just enough to get a full view according to newt.To get a fully illuminated field i should still go for another 1.5 to 2 cm but as i said for visual viewing it is of no importance.
It's a nice tube though, very light. Sofar my sec did not dew up because it is so deep in the tube.
I have now a sec obstruction of 25% wich does fine for visual observing. You could say this i a photographic scope i tuned a bit for visual observing.

[urke]

Removed nylon bolts? Did you replaced them with something?

Another thing about focuse: it could be better (haha) and curved spacer between ota'n'fosucer could be thinner

About scratches on prim, shoul i be in panic, still cannot understand (quality check nearly passed..?)

tnx,
Uros

[F.Meiresonne]

I removed them and layed the mirror on 3 vilts and 3 blobs of TEC7 (so 6 support points). I putted matches under it until the TEC7 stuff dried. Then i removed the matches.
So the TEC7 blobs and the vilts hold and support the mirror. So i could remove the clamps, => less diffraction...

Don't know about the scrathes. I mailed your picture a friend of mine who makes his owns mirrors.
Anyhow i would surely mail the picture to OO. Let's hear what they have to say about it.
When i complained about my focusser they were willing to replace it, but i solved the problem myself or at least to an acceptable level.

[urke]

What was wrong with yo focuser?
I'll mail them today and report what they say.

[F.Meiresonne]

It was badly drilled. On tension screw (it has 4) had no grip and just fell out. It was difficult to tune it. The drawtube is not 90° and sits a tiny bit shifted due to the fact one side has only 1 tension screw.
So it took a lot of fiddling to get it right.
After some evenings i got it OK after i figured out how to collimate the focusser (which can be done).
My focusser is not thesame as yours, it's the older crayford type...

[Stefan Rostyne]

I mailed your picture a friend of mine who makes his owns mirrors

Hi Urke!

Congratulations on your new system!

I must say I was quite surprised to see the many scratches on your mirror, and allthough these wil not be much of an influence on the image, they are not normal. To me, they look like they are caused by something rolling on the surface, during transport or something, like a loose screw.

If I were you, I would contact OO as soon as possible and vow your complaints, also show 'm the pictures. As a mirror maker, I would not accept a mirror like that.

[urke]

Thanks Stefan, can't wait to try it under the night sky (but without clouds 'course).

I just received reply from OO and this is what they say, thery're not "scratches" as I called them:

These small marks are called sleeks, they are not scratches. They are dues to the final, very accurate hand work carried out on your mirror to achieve the image quality the telescope produces.

They will have zero effect on the telescope's peformance. If you want to return just the mirror, we can exchange it for you.

I'm calmed dow now,...but if nothing's wrong with mirror and everithing is fine, why they offer me an exchange? Should I go for exchange, wait for another month or so?


CS!
Uros

[stefanj]

I think they are standing behind their product- I would not worry about the sleeks- Looks like you have a very fine instrument in your hands- and it should provide you with some fine views- Have you had a chance for first light?