Initial Review: Vixen R200SS 8" F4

Bought a new toy? How about writing a review for it? Post it here!
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weixing
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Favourite scope: Vixen R200SS & Celestron 6" F5 Achro Refractor
Location: (Tampines) Earth of Solar System in Orion Arm of Milky Way Galaxy in Local Group Galaxies Cluster

Post by weixing »

Hi,
Weixing, try to invest in some good collimation tools for this scope because at f/4 it's freaking sensitive to collimation. A laser is not good enough.
Yap... But most of them are very expensive and only got 2" version. Anyway, will get one once I got the budget.

Anyway, after looking at the Vixen Coma Corrector2 with the attachment plate, I realize that it's actually equivalent to the MPCC... Since the Vixen Coma Corrector2 is design to use on DSLR, it's must be having the same 55mm requirement as the MPCC. So the Vixen 1.25" eyepiece holder will also be able to use on the MPCC. Luckily, I still have the low profile 2" eyepiece adapter for 60mm drawtube with me, so will still be able to use the MPCC on the Vixen R200SS. Now just need to test which coma corrector is better...
[smilie=victory.gif]

Have a nice day.
Yang Weixing
:mrgreen: "The universe is composed mainly of hydrogen and ignorance." :mrgreen:

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ariefm71
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Post by ariefm71 »

is the mount doing fine?

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weixing
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Posts: 4699
Joined: Wed Oct 01, 2003 12:22 am
Favourite scope: Vixen R200SS & Celestron 6" F5 Achro Refractor
Location: (Tampines) Earth of Solar System in Orion Arm of Milky Way Galaxy in Local Group Galaxies Cluster

Post by weixing »

Hi,
is the mount doing fine?
Yap... work quite well... still trying to get use to an Alt-Az mount way for pointing.

So my turn to ask: is the mount doing fine?? :mrgreen: :mrgreen:

Have a nice day.
Yang Weixing
:mrgreen: "The universe is composed mainly of hydrogen and ignorance." :mrgreen:

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weixing
Super Moderator
Posts: 4699
Joined: Wed Oct 01, 2003 12:22 am
Favourite scope: Vixen R200SS & Celestron 6" F5 Achro Refractor
Location: (Tampines) Earth of Solar System in Orion Arm of Milky Way Galaxy in Local Group Galaxies Cluster

Post by weixing »

Hi,
Found a backpack for OMO that can fit the Vixen R200SS OTA and hopefully all my necessary observing accessories:
Image

Now just need to figure out an optimize internal arrangement and decide what to bring.

Have a nice day.
Yang Weixing
:mrgreen: "The universe is composed mainly of hydrogen and ignorance." :mrgreen:

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rlow
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Post by rlow »

I do not really notice coma using Pentax XL eyepieces with my 8" f/4
Strange... I have observed coma before with the Pentax XW on the R200SS... maybe I need to get my eyes checked....
Richard Low

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weixing
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Posts: 4699
Joined: Wed Oct 01, 2003 12:22 am
Favourite scope: Vixen R200SS & Celestron 6" F5 Achro Refractor
Location: (Tampines) Earth of Solar System in Orion Arm of Milky Way Galaxy in Local Group Galaxies Cluster

Post by weixing »

Hi,
An update on the Vixen R200SS review as I remove the primary mirror to do some cleaning.

The primary mirror was in a circular primary mirror holder which use 3 set screws and some padding to secure itself to the primary mirror from the side. Not sure how to remove the primary mirror holder, I clean the primary mirror with the holder... hope that it's ok and will not cause any problem in the future... crossed finger... :P :P :P

Anyway, at the front of the primary mirror holder, there are 4 sets of screws use for the installing the mirror clip which didn't touch the mirror surface as they are use to prevent the primary mirror from dropping out of the mirror cell if the side set screws failed to hold the mirror (touch wood). There is also a mirror clip mask that "hide" the mirror clip from the view. This should prevent the diffraction spikes cause by the mirror clip to appear on those bright star in long exposure astrophoto. I think the earlier version of Vixen R200SS don't have this mask as I had seen some Vixen R200SS user in other forum complaint about this. Anyway, the mask and mirror clip just cover the primary mirror by... may be less than 1mm in total, so the primary mirror didn't loss much light gathering power.

At the rear of the primary mirror holder, there are 4 threaded holes at the rear of the circular holder for the "pull" collimating screws. The collimating screws will "push" and "pull" the primary mirror holder during collimation.

The interesting part about the Vixen R200SS primary mirror is that you can see a bullseye pattern at the center of the primary mirror from the rear. Base on one of the review I read, the area where the bullseye pattern is actually partial aluminiumised, so that when you shine a light from behind (you must remove the rear primary mirror cover in the mirror cell to do this), you can see the bullseye pattern on the primary mirror from the front and when the laser collimator hit the center of the bullseye, you'll see the laser exist at the rear... quite an unique feature... :)

Anyway, since my primary mirror already center spot by meng lee, I didn't remove the rear primary mirror cover... hmm... may be I should remove it next time as it should cool the primary mirror faster.

Below are some pictures I took:
Vixen R200SS Mirror Clip and Mask
Image

Vixen R200SS Primary Mirror Cell Holder with Rear Primary Mirror Cover
Image

Vixen R200SS Primary Mirror with Mirror Holder - Front view
Image

Vixen R200SS Primary Mirror with Mirror Holder - Rear View
Image

Have a nice day.
Yang Weixing
:mrgreen: "The universe is composed mainly of hydrogen and ignorance." :mrgreen:

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boothee
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Location: Myanmar

Post by boothee »

Can't see your pics. . . :(
1150mm, 254mm, Newtonion Reflector on EQ5 Mount with dual axis DK3 drive, QHY5 Camera, Canon 300D + Kit Lens, Yangon, Myanmar.

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