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APO Doublet vs Triplet

Started by Cometeer , Jun 14 2015 09:32 PM

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85 replies to this topic

#76 Jon_Doh

Gemini

Posts: 3,296
Joined: 16 Sep 2011

Posted 22 June 2015 - 10:06 AM

Don't know nuthin' 'bout no airy disks, but I did see a hairy disk once :lol: . The telescope had been stored in a garage and had all kinds of mold or mildew growing in the tube.

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#77 Daniel Mounsey

Voyager 1

Posts: 10,229
Joined: 12 Jun 2002

Posted 23 June 2015 - 11:57 PM

Hey all, I'm a greenbean when it comes to refractors. I appreciate your help.

I'm wondering that's the main difference between an APO doublet and a triplet in terms of image quality

Hopefully someone can clear my mind. Thanks!

Don't get too wrapped up in all the triplet hype. Apo doublets are plenty good. Pay closer attention to the spherical correction. You can have all the color correction in the world, but it doesn't gain you any contrast if the spherical correction is off. It's harder to achieve this in mass production with sophisicated triplet designs.

drD

www.doctordreviews.com

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#78 BillP

ISS

Posts: 21,589
Joined: 26 Nov 2006

Posted 24 June 2015 - 07:58 AM

Don't get too wrapped up in all the triplet hype. Apo doublets are plenty good. Pay closer attention to the spherical correction. You can have all the color correction in the world, but it doesn't gain you any contrast if the spherical correction is off. It's harder to achieve this in mass production with sophisicated triplet designs.

drD

www.doctordreviews.com

:waytogo:

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#79 SandyHouTex

Voyager 1

Posts: 10,211
Joined: 02 Jun 2009

Posted 24 June 2015 - 10:01 AM

Hey all, I'm a greenbean when it comes to refractors. I appreciate your help.

I'm wondering that's the main difference between an APO doublet and a triplet in terms of image quality

Hopefully someone can clear my mind. Thanks!

Don't get too wrapped up in all the triplet hype. Apo doublets are plenty good. Pay closer attention to the spherical correction. You can have all the color correction in the world, but it doesn't gain you any contrast if the spherical correction is off. It's harder to achieve this in mass production with sophisicated triplet designs.

drD

www.doctordreviews.com

:waytogo: I love my FS-152 doublet.

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#80 Daniel Mounsey

Voyager 1

Posts: 10,229
Joined: 12 Jun 2002

Posted 24 June 2015 - 10:54 PM

Hey all, I'm a greenbean when it comes to refractors. I appreciate your help.

I'm wondering that's the main difference between an APO doublet and a triplet in terms of image quality

Hopefully someone can clear my mind. Thanks!

Don't get too wrapped up in all the triplet hype. Apo doublets are plenty good. Pay closer attention to the spherical correction. You can have all the color correction in the world, but it doesn't gain you any contrast if the spherical correction is off. It's harder to achieve this in mass production with sophisicated triplet designs.

drD

www.doctordreviews.com

I love my FS-152 doublet.

I love my FS152 more. :grin:

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#81 bobhen

Cosmos

Posts: 8,803
Joined: 25 Jun 2005

Posted 25 June 2015 - 08:31 AM

Hey all, I'm a greenbean when it comes to refractors. I appreciate your help.

I'm wondering that's the main difference between an APO doublet and a triplet in terms of image quality

Hopefully someone can clear my mind. Thanks!

Don't get too wrapped up in all the triplet hype. Apo doublets are plenty good. Pay closer attention to the spherical correction. You can have all the color correction in the world, but it doesn't gain you any contrast if the spherical correction is off. It's harder to achieve this in mass production with sophisicated triplet designs.

drD

www.doctordreviews.com

I love my FS-152 doublet.

I love my FS152 more.

I love my AP155 “triplet” even more (yeah even for visual) and these 5 guys ALL seem to agree! LINK

Bob

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#82 schang

Surveyor 1

Posts: 1,654
Joined: 24 Apr 2013

Posted 25 June 2015 - 09:11 AM

I love you guys the most...now go back to work, I mean to your real job :grin:

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#83 doctordub

Mercury-Atlas

Posts: 2,764
Joined: 11 Jan 2006

Posted 26 June 2015 - 09:45 AM

Shien,

I have the day off!

CS

Jonathan

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#84 doctordub

Mercury-Atlas

Posts: 2,764
Joined: 11 Jan 2006

Posted 26 June 2015 - 09:51 AM

Hey all, I'm a greenbean when it comes to refractors. I appreciate your help.

I'm wondering that's the main difference between an APO doublet and a triplet in terms of image quality

Hopefully someone can clear my mind. Thanks!

Don't get too wrapped up in all the triplet hype. Apo doublets are plenty good. Pay closer attention to the spherical correction. You can have all the color correction in the world, but it doesn't gain you any contrast if the spherical correction is off. It's harder to achieve this in mass production with sophisicated triplet designs.

drD

www.doctordreviews.com

I love my FS-152 doublet.

I love my FS152 more.

I love my AP155 “triplet” even more (yeah even for visual) and these 5 guys ALL seem to agree! LINK

Bob

I have already told Dr. D. at NEAF this year that I have the best Tak FS 152. :lol:

Bob, I've been on the AP waiting list since 2005! If I ever take delivery I will see if this quote from your link is true,"True to its nature, the Tak exhibited slightly better contrast in the

razor-thin edge between planet and background."

CS

Jonathan