Go Back   IceInSpace > Equipment > Eyepieces, Barlows and Filters
Register FAQ Calendar Today's Posts Search

Reply
 
Thread Tools Rate Thread
  #1  
Old 17-09-2005, 11:33 PM
Oldboy
Registered User

Oldboy is offline
 
Join Date: Sep 2005
Location: Launceston
Posts: 21
which comes first

Having just aquired a cheap refracting scope (yes I know, don't say it) which has the worst Jinglish manual I've seen I have a question re the position/order of eye pieces.

Which should be attached first; the right angle adaptor, Barlow, or erecting lens AND can the Barlow and erecting be used together??
Reply With Quote
  #2  
Old 17-09-2005, 11:46 PM
janoskiss's Avatar
janoskiss (Steve H)
Registered User

janoskiss is offline
 
Join Date: Jan 2005
Location: Sale, VIC
Posts: 6,033
You should insert the right angle adaptor in the focuser and then the lowest power (longest focal length, probably around 20mm) eyepiece. Then point and look through the eyepiece.
Reply With Quote
  #3  
Old 18-09-2005, 12:00 AM
astroron's Avatar
astroron (Ron)
Supernova Searcher

astroron is offline
 
Join Date: Mar 2005
Location: Cambroon Queensland Australia
Posts: 9,326
The erecting prism is used for daylight only as there is no up and down in the night sky,you can use the barlow with the right angle adapter and the erecting prism.
the barlow goes in first then the right angle adapter then the eyepiece, the same procedure with the erecting prism.
Dont use highpower eyepieces use only low power such as the above post says, I presume it is a 60mm refractor and has a long barlow
Reply With Quote
  #4  
Old 18-09-2005, 12:50 AM
janoskiss's Avatar
janoskiss (Steve H)
Registered User

janoskiss is offline
 
Join Date: Jan 2005
Location: Sale, VIC
Posts: 6,033
Orion has a good, freely available, English language users' guide for a 60mm alt-az mounted scope. Here is a link to it:

http://www.telescope.com/text/conten...er_60mm_AZ.pdf

Although there is no mention of Barlows or other accessories in that guide, the Orion website is a good resource for astro gear documentation in general.
Reply With Quote
  #5  
Old 18-09-2005, 02:28 AM
square_peg114GT's Avatar
square_peg114GT
Registered User

square_peg114GT is offline
 
Join Date: Aug 2005
Location: Maple Valley, WA, USA
Posts: 98
A shorty balrow can be used either before or after the diagonal. It's location will determine it's magnification. A typical 2x barlow may produce 3x-5x if placed before the diagonal. This will probably be too much power for that little refractor.
Reply With Quote
  #6  
Old 18-09-2005, 08:57 AM
acropolite's Avatar
acropolite (Phil)
Registered User

acropolite is offline
 
Join Date: Feb 2005
Location: Launceston Tasmania
Posts: 9,021
With regard to your cheapo refractor, in some cases anything's better than nothing at all, unless you're looking at terrestrial (landbased) targets, don't worry about the erecting lens. The barlow, if useable at all, will only be useful when the atmospheric conditions are suitable. i.e. no jetstream, (see http://squall.sfsu.edu/crws/jetstream.html) clear skies and no wind. Even with modest magnification (say 25x or greater) you should be able to make out Jupiters disk and 4 of the moons and see saturn complete with rings. The moon is also a great target at almost any time of the month.
Reply With Quote
  #7  
Old 20-09-2005, 09:28 PM
Oldboy
Registered User

Oldboy is offline
 
Join Date: Sep 2005
Location: Launceston
Posts: 21
Talking manuals for scopes

Thanks for the pointer towards Orion, have downloaded the 60mm refractor and the 6/8" dobs manuals; they are excellent
Is there an Oz Orion dealer?????
Quote:
Originally Posted by janoskiss
Orion has a good, freely available, English language users' guide for a 60mm alt-az mounted scope. Here is a link to it:

http://www.telescope.com/text/conten...er_60mm_AZ.pdf

Although there is no mention of Barlows or other accessories in that guide, the Orion website is a good resource for astro gear documentation in general.
Reply With Quote
  #8  
Old 20-09-2005, 09:53 PM
janoskiss's Avatar
janoskiss (Steve H)
Registered User

janoskiss is offline
 
Join Date: Jan 2005
Location: Sale, VIC
Posts: 6,033
Yes there is Orion dealers in Oz, but the Orion Dobs are just repainted and rebadged GSO scopes. Unless you're interested in the "Intelliscopes" with a Push-To computer, you can consider noname GSO (aka Andrews, Bintel ...) and Orion GSO Dobs to be the same thing. I can't remember who sells the Orion Dobs, but I've seen them on at least one local dealer's site.
Reply With Quote
  #9  
Old 20-09-2005, 10:14 PM
norm's Avatar
norm
Registered User

norm is offline
 
Join Date: Aug 2005
Location: Ashfield NSW
Posts: 778
Astro-Opticals in St Leonards stock Orion OTA's and Dobs. Be advised the Orion Dobs aren't cheap. $1700 for a 10" Dob, $300 for the optional intelliscope computer. Quote price Late August 2005.
Reply With Quote
  #10  
Old 20-09-2005, 10:21 PM
ballaratdragons's Avatar
ballaratdragons (Ken)
The 'DRAGON MAN'

ballaratdragons is offline
 
Join Date: Jan 2005
Location: In the Dark at Snake Valley, Victoria
Posts: 14,412
I remember reading a U.S. review about Orions. The review said "they are just GS scopes! Although of excellent quality they are still just GS scopes."

Except, in the review, the reviewer kept refering to them as Guan Sheng scopes rather than the more common name 'GS'.
Reply With Quote
  #11  
Old 20-09-2005, 10:30 PM
Starkler's Avatar
Starkler (Geoff)
4000 post club member

Starkler is offline
 
Join Date: Sep 2004
Location: Melbourne
Posts: 4,900
Quote:
Originally Posted by ballaratdragons
I remember reading a U.S. review about Orions. The review said "they are just GS scopes! .
That review must be old. A few years ago Orion were selling GS dobs as their own. They then sourced their scopes from Synta which is their current supplier.

Its been something like three years since Orion sold GS dobs.
Reply With Quote
  #12  
Old 20-09-2005, 10:41 PM
janoskiss's Avatar
janoskiss (Steve H)
Registered User

janoskiss is offline
 
Join Date: Jan 2005
Location: Sale, VIC
Posts: 6,033
All this branding confusion. I wish suppliers would just state up-front what they're selling and where it comes from.

Aren't Synta Dobs the same as Saxon & Celestron Dobs with Pyrex mirrors in the 10 & 12" sizes? Orion and GSO are both BK7s..

Last edited by janoskiss; 20-09-2005 at 11:05 PM.
Reply With Quote
  #13  
Old 21-09-2005, 06:04 AM
iceman's Avatar
iceman (Mike)
Sir Post a Lot!

iceman is offline
 
Join Date: Sep 2004
Location: Gosford, NSW, Australia
Posts: 36,799
Orion are good, but they are much more expensive than the GS counterparts - i'd go for the GS and spend the savings on eyepieces and accessories!
Reply With Quote
  #14  
Old 21-09-2005, 09:12 AM
janoskiss's Avatar
janoskiss (Steve H)
Registered User

janoskiss is offline
 
Join Date: Jan 2005
Location: Sale, VIC
Posts: 6,033
BTW Oldboy, Who's on second!
...
get it? Which comes first, Who's on ... aah, forget it.
Reply With Quote
  #15  
Old 21-09-2005, 09:26 AM
ving's Avatar
ving (David)
~Dust bunny breeder~

ving is offline
 
Join Date: Nov 2004
Location: The town of campbells
Posts: 12,359
hiya old boy
so how your going with that refractor now?
any more questions?
Reply With Quote
  #16  
Old 21-09-2005, 10:31 AM
ausastronomer (John Bambury)
Registered User

ausastronomer is offline
 
Join Date: Mar 2005
Location: Shoalhaven Heads, NSW
Posts: 2,620
Quote:
Originally Posted by square_peg114GT
A shorty balrow can be used either before or after the diagonal. It's location will determine it's magnification. A typical 2x barlow may produce 3x-5x if placed before the diagonal. This will probably be too much power for that little refractor.
Peg,

Correct but won't work with that scope IMO. Putting the barlow before the diagonal will produce nothing but "fuzzballs" as the scope will be unlikely to handle the higher magnification produced by using the barlow before the diagonal. To be honest its unlikely that the barlow will do much good after the diagonal with anything other than the lowest power eyepieces either.

CS-John B
Reply With Quote
  #17  
Old 21-09-2005, 09:40 PM
Oldboy
Registered User

Oldboy is offline
 
Join Date: Sep 2005
Location: Launceston
Posts: 21
my cheap refractor

Quote:
Originally Posted by ving
hiya old boy
so how your going with that refractor now?
any more questions?
all is well at the moment, less clouds and more time would help things though.......................
must get a dobs, haven't got the quote back from the local seller yet
Reply With Quote
  #18  
Old 21-09-2005, 09:49 PM
ballaratdragons's Avatar
ballaratdragons (Ken)
The 'DRAGON MAN'

ballaratdragons is offline
 
Join Date: Jan 2005
Location: In the Dark at Snake Valley, Victoria
Posts: 14,412
Who is the local seller in Launceston? I didn't know there was a scope shop in Tassie!
Reply With Quote
  #19  
Old 21-09-2005, 09:51 PM
ballaratdragons's Avatar
ballaratdragons (Ken)
The 'DRAGON MAN'

ballaratdragons is offline
 
Join Date: Jan 2005
Location: In the Dark at Snake Valley, Victoria
Posts: 14,412
David Pretorius, shame on you!! Why haven't you helped out our new member 'Oldboy'? He is in Lonnie.
Reply With Quote
  #20  
Old 21-09-2005, 10:09 PM
Oldboy
Registered User

Oldboy is offline
 
Join Date: Sep 2005
Location: Launceston
Posts: 21
Quote:
Originally Posted by ballaratdragons
Who is the local seller in Launceston? I didn't know there was a scope shop in Tassie!
sorry should elaborate, its just the local camera shop but he can access scopes - little knowledge but he seems keen to help (and get a sale)
bit slow at getting the quote prepared
Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 05:55 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement