Celestron Scope?

Here is the place to talk about all those equipment(Telescope, Mounts, Eyepieces, etc...) you have. Not sure which scope/eyepiece is best for you? Trash it out here!
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weixing
Super Moderator
Posts: 4708
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,
I think the S$3K is the cost for an astrophotography setup and most of it goes to Vixen GP mount with Motor drive...

If he want to do astroghotography, then he must use a EQ mount and a Vixen GP mount is highly recommended... I may be getting one too and soon... hee hee... :P

Happy imaging and have a nice day.
Yang Weixing
:mrgreen: "The universe is composed mainly of hydrogen and ignorance." :mrgreen:
blurblock
Posts: 261
Joined: Wed Dec 17, 2003 7:12 am

Post by blurblock »

I notice Weixing stay in Tampines too, may I know where often do you Gaze the Stars? I stay in Tampines too, find it is too bright there so most of the the time I would just bring my camera to the ulu ulu place in Tampines Ave 10 to take pictures of Star Trail. But sad to say, never got the chance to take a good star trail yet :(.

But the place is good for star gazing, very dark (when there is no full moon) and no street lights (quite seldom we find places without street lights already.... even bukit timah reserve is flooded with street lights ;)

My gallery is at http://ytphoto.clubsnap.org/gallery/
cinq
Posts: 34
Joined: Sun Sep 21, 2003 2:55 pm

Post by cinq »

Hey Addy

Thanks for the vote of confidence :). If blurblock decides to proceed, he might be taking the whole package though, so I'll be in touch with you about the 2" ep and adapter. You still in erm, I forget, it was either france or japan right?

btw, just curious, anyone know the central obstruction for the celestron scope mentioned? Just wondering if they made any improvements since I checked a few years ago.

cheers
cindy
blurblock
Posts: 261
Joined: Wed Dec 17, 2003 7:12 am

Post by blurblock »

The central obstruction for the Celestron Scope? .... give you the whole technical spec lah :)

Highest Useful Magnification
480x

Lowest Useful Magnification
29x

Limiting Stellar Magnitude
14

Resolution: Rayleigh
.68 arcseconds

Dawes Limit
.57 arcseconds

Photographic Resolution
200 lines/mm

Light Gathering Power
843x unaided eye

Field Of View: standard eyepiece
.64 degrees

Linear FOV (@1000 yd.)
33.6 ft.

Secondary Mirror Obstruction
2.5" (10% by area or 31% by diameter)

Optical Coatings
StarBright Coating

Optical Tube Length
17"

Telescope Weight
54.5 lb (or 24.675432 kg)

hehehe .... problem with information specialist is we often jolt down to the last detail but never tell anything pass the superificial ;).
blurblock
Posts: 261
Joined: Wed Dec 17, 2003 7:12 am

Post by blurblock »

cinq wrote:Hey Addy

Thanks for the vote of confidence :). If blurblock decides to proceed, he might be taking the whole package though, so I'll be in touch with you about the 2" ep and adapter. You still in erm, I forget, it was either france or japan right?

btw, just curious, anyone know the central obstruction for the celestron scope mentioned? Just wondering if they made any improvements since I checked a few years ago.

cheers
cindy
Sent you SMS and PM already :)
cinq
Posts: 34
Joined: Sun Sep 21, 2003 2:55 pm

Post by cinq »

Hi

Wah, that's a lot of specs but are that manufacturer's specs? I remember the rule of thumb for highest magnification is 50x per inch, so an 8" should only go up to 400x and that's in excellent conditions with perfect seeing, which well, we Singaporeans know how often the perfect nights come along (usually when I'm dead tired ;)

My personal limited experience is that a sharper image usually happens at lower power. Then again, I have seen some singastro-ers a few years back rather excited over having managed a higher power (with stacked barlows I think?) at a star party, but I looked with my own eyes and the image was dark and a little fuzzy so I would have stopped at a lower power coz even though the size is smaller, the image was better and brighter. Your mileage may vary. My own scope, I went up to 235x coz that's what my equipment allowed (before I sold you that 1.8x TV barlow, Addy!!).

Cindy
blurblock
Posts: 261
Joined: Wed Dec 17, 2003 7:12 am

Post by blurblock »

Yup, manufacturer specs from Science Centre :) ..... they are charging a bomb for this telescope ....
User avatar
weixing
Super Moderator
Posts: 4708
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,

I normally observe at the grass patch beside Tampines Stadium which is near my block. Light pollution is quite serious, but convenient (I don't drive) and safety are my primary concern. If on a moonless night and I was not observing alone, then observation will take place in the big grass field opposite the swimming pool (near ave 6).
ulu ulu place in Tampines Ave 10
Where is it??? May be can go there for over night observation when weather is more predictable... :)

Have a nice day.
Yang Weixing
:mrgreen: "The universe is composed mainly of hydrogen and ignorance." :mrgreen:
blurblock
Posts: 261
Joined: Wed Dec 17, 2003 7:12 am

Post by blurblock »

Ave 10 lor ...... near the sand mine. the only lights there I can often see is one tiny red light across the lake :P........ which serve no purpose other then my personal guiding light ;). But be prepared to be feed by Mosqitos ;).

BTW, I do not drive too, normally just take number 8 and drop outside the condo near Temasek Poly, walk 5 mins to the ulu ulu place :)...... u had seen my gallery right? that was took from the ulu ulu place lor :).
User avatar
weixing
Super Moderator
Posts: 4708
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,
I remember the rule of thumb for highest magnification is 50x per inch, so an 8" should only go up to 400x and that's in excellent conditions with perfect seeing
Practical maximum magnification is generally 50x per inch or 60x per inch when in good weather and should not greater than 300x. Anything more than 300x are not practical, unless you are observing planets or double stars and the weather condition is excellent.

Just my personal opinion and have a nice day.
Yang Weixing
:mrgreen: "The universe is composed mainly of hydrogen and ignorance." :mrgreen:
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