Results 1 to 7 of 7
  1. #1
    karateman's Avatar
    karateman is offline Bright Giants
    Points: 12,031, Level: 75
    Level completed: 94%, Points required for next Level: 19
    Overall activity: 0%
    Achievements:
    365 Days+ Registered Achievement!750 Days+ Registered Achievement!First 1000 Experience Points200+ Posts Achievement!1000 Days+ Registered Achievement!
    Join Date
    Sep 2008
    Location
    Accrington Lancashire England
    Posts
    217
    Points
    12,031
    Level
    75
    Thanks
    39
    Thanked 23x 15 Posts

    Default 2" or 1.5" Barlow



    Hi Guys,
    I have a C80 ED celestron with a 2" focuser and 2" dialectric diagonal. Would I be better using this diagonal for my 1.5" eyepieces or a 1.5 diagonal?

    I also want to buy a Ed Barlow lens. Would I be better getting a 2" one that accepts 1.5 EP's or a 1.5" ED barlow with my 1.5 EP's?

    In other words is there any detriment using 2" diagonals and Barlows etc with 1.5 EP's?....... or basically should 2" go with 2" and 1.5" go with 1.5" and never the twain shall meet...lol

    Phil

  2. #2
    roverich's Avatar
    roverich is offline Moderator
    Points: 41,419, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    Got three Friends20+ Friends Achievement!First 1000 Experience Points5+ Referrals Achievement!100+ Threads Achievement!
    Join Date
    Jan 2009
    Location
    virginia .usa
    Posts
    7,913
    Points
    41,419
    Level
    100
    Thanks
    2,009
    Thanked 1,962x 1,528 Posts

    Default

    Hi Phil ...I have both 2in. and 1.25in Barlow's but i rarely us the 1.25 Barlow's anymore ...Usualy i use my 2in. eyepieces so the 2in Barlow makes more sense ..Most 2in Barlow's come with 1.25in adapters so it makes more sense to get the larger and use an adapter if you decide to use the smaller eyepieces.....In addition to looking for a ED Barlow , make sure to get one that is fully multi coated .... The coating allows more light to pass through the light train and reach the eye ...
    16in Night sky
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    F4.5 , 90mm refractor 500mm FL , 7in
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    classic Big-mac , Meade eye pieces with a few odd balls thrown in ...
    If you cant stand behind the american soldier ,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Please stand in front of one ...

  3. #3
    karateman's Avatar
    karateman is offline Bright Giants
    Points: 12,031, Level: 75
    Level completed: 94%, Points required for next Level: 19
    Overall activity: 0%
    Achievements:
    365 Days+ Registered Achievement!750 Days+ Registered Achievement!First 1000 Experience Points200+ Posts Achievement!1000 Days+ Registered Achievement!
    Join Date
    Sep 2008
    Location
    Accrington Lancashire England
    Posts
    217
    Points
    12,031
    Level
    75
    Thanks
    39
    Thanked 23x 15 Posts

    Default

    Hi Rich,
    I dont have any 2" EP's but you never know....... when I can afford them I will probably buy 1 or 2......
    The Barlow I was thinking of getting is a Meade Triplet Apo Barlow 2x 4000 series on E Bay
    Heard of it?

    Phil

  4. #4
    roverich's Avatar
    roverich is offline Moderator
    Points: 41,419, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    Got three Friends20+ Friends Achievement!First 1000 Experience Points5+ Referrals Achievement!100+ Threads Achievement!
    Join Date
    Jan 2009
    Location
    virginia .usa
    Posts
    7,913
    Points
    41,419
    Level
    100
    Thanks
    2,009
    Thanked 1,962x 1,528 Posts

    Default

    Yea ...I heard of it ...There are cheaper barlows out there that are compareable to it ...I bought a proxima 2in. barlow in the 1.5 power and am very happt with it ... The proxima stuff is made in japan but i hear the GSO stuff is alright as well ..Spend what you want but i believe the meade stuff is made in the same factory as the GSO stuff is ...Is the price on e-bay a decient price from a reputable seller like an optic shop ?If not , i would stay clear of e-bay ...There are good deals on E-bay but they are few and far between .... You get what you pay for these days ....
    16in Night sky
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    F4.5 , 90mm refractor 500mm FL , 7in
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    classic Big-mac , Meade eye pieces with a few odd balls thrown in ...
    If you cant stand behind the american soldier ,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Please stand in front of one ...

  5. #5
    karateman's Avatar
    karateman is offline Bright Giants
    Points: 12,031, Level: 75
    Level completed: 94%, Points required for next Level: 19
    Overall activity: 0%
    Achievements:
    365 Days+ Registered Achievement!750 Days+ Registered Achievement!First 1000 Experience Points200+ Posts Achievement!1000 Days+ Registered Achievement!
    Join Date
    Sep 2008
    Location
    Accrington Lancashire England
    Posts
    217
    Points
    12,031
    Level
    75
    Thanks
    39
    Thanked 23x 15 Posts

    Default

    Quote Originally Posted by roverich View Post
    Hi Phil ...I have both 2in. and 1.25in Barlow's but i rarely us the 1.25 Barlow's anymore ...Usualy i use my 2in. eyepieces so the 2in Barlow makes more sense ..Most 2in Barlow's come with 1.25in adapters so it makes more sense to get the larger and use an adapter if you decide to use the smaller eyepieces.....In addition to looking for a ED Barlow , make sure to get one that is fully multi coated .... The coating allows more light to pass through the light train and reach the eye ...
    Er! I asked if a Meade ED barlow being sold on EBay was fully multicoated and got the response Dont know..does it matter?.......... I sent a small reply about coatings being important to serious astronomers and got this reply...

    hi, i build apochromatic and achromatic refractors. i understand all about phase coatings and cold and hot evaperation coatings, also broad band magnesium coatings. its a low cost triplet apo. dosnt matter even 1% if its only coated one 1 lens surface or all 6. its just a barlow, not an objective. ive also seen the articles about multi / fully multi and the wrest.dosn,t make a hoot in real life. theres uncoated refractors out there that will knock the socks off modern fully coated refractors. its all a ploy for more money off the consumer. i will put my uncoated 5 1/4" david hinds refractor against any coated 6" achromat you can name. i have a 10" refractor myself in my own observatory and building telescopes is my income and job, so hopefully i qualify as a serious astronomer. thanks steve.

    Do you think I upset him.........lol

    Phil

  6. #6
    roverich's Avatar
    roverich is offline Moderator
    Points: 41,419, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    Got three Friends20+ Friends Achievement!First 1000 Experience Points5+ Referrals Achievement!100+ Threads Achievement!
    Join Date
    Jan 2009
    Location
    virginia .usa
    Posts
    7,913
    Points
    41,419
    Level
    100
    Thanks
    2,009
    Thanked 1,962x 1,528 Posts

    Default

    Quote Originally Posted by karateman View Post
    Er! I asked if a Meade ED barlow being sold on EBay was fully multicoated and got the response Dont know..does it matter?.......... I sent a small reply about coatings being important to serious astronomers and got this reply...

    hi, i build apochromatic and achromatic refractors. i understand all about phase coatings and cold and hot evaperation coatings, also broad band magnesium coatings. its a low cost triplet apo. dosnt matter even 1% if its only coated one 1 lens surface or all 6. its just a barlow, not an objective. ive also seen the articles about multi / fully multi and the wrest.dosn,t make a hoot in real life. theres uncoated refractors out there that will knock the socks off modern fully coated refractors. its all a ploy for more money off the consumer. i will put my uncoated 5 1/4" david hinds refractor against any coated 6" achromat you can name. i have a 10" refractor myself in my own observatory and building telescopes is my income and job, so hopefully i qualify as a serious astronomer. thanks steve.

    Do you think I upset him.........lol

    Phil
    Hi Phil ...Yea , I tink you struck a nerve with the seller ... LOL... I wonder why he was selling it ? Had to be for some reason ...With him being a scope builder , he should know about optical coatings and there importance ...Was the barlow brand new i wonder ?
    16in Night sky
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    F4.5 , 90mm refractor 500mm FL , 7in
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    classic Big-mac , Meade eye pieces with a few odd balls thrown in ...
    If you cant stand behind the american soldier ,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Please stand in front of one ...

  7. #7
    karateman's Avatar
    karateman is offline Bright Giants
    Points: 12,031, Level: 75
    Level completed: 94%, Points required for next Level: 19
    Overall activity: 0%
    Achievements:
    365 Days+ Registered Achievement!750 Days+ Registered Achievement!First 1000 Experience Points200+ Posts Achievement!1000 Days+ Registered Achievement!
    Join Date
    Sep 2008
    Location
    Accrington Lancashire England
    Posts
    217
    Points
    12,031
    Level
    75
    Thanks
    39
    Thanked 23x 15 Posts

    Default

    Quote Originally Posted by roverich View Post
    Hi Phil ...Yea , I tink you struck a nerve with the seller ... LOL... I wonder why he was selling it ? Had to be for some reason ...With him being a scope builder , he should know about optical coatings and there importance ...Was the barlow brand new i wonder ?
    No it was s/h...it was the "its just a barlow, not an objective...doesn't make a hoot in real life" that threw me...I thought any lens would benefit from coatings

    Phil
    Last edited by karateman; 11-13-2009 at 08:43 PM.

 

 

Similar Threads

  1. Can Anyone Clarify a "Good" Barlow????....
    By sandy in forum Telescope Eyepieces Forum
    Replies: 10
    Last Post: 07-10-2009, 07:24 AM
  2. Seeking barlow "clear aperture requirement(?)" formula
    By Lawrence Sayre in forum Amateur Astronomy Forum
    Replies: 16
    Last Post: 01-17-2006, 11:52 PM
  3. need email addresses of "Emil Bonnano" and "Perry Remaklus" (MEGASTAR)
    By Michael Feiler in forum UK Astronomy Forum
    Replies: 2
    Last Post: 12-16-2004, 08:21 PM
  4. MEBAY: "Space Frontiers," "Shuttle/Comet," "Secrets of Space"
    By Scott Lowther in forum Space Exploration History Forum
    Replies: 8
    Last Post: 11-15-2003, 09:41 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin® Version 4.2.0
Powered by vBulletin®
All times are GMT. The time now is 10:21 PM.