Date   

Re: Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"

Stone, Jack G
 

Guys – Did you say Party phones that went along with the patch panel?  And scary glow of the lines when a lightning storm went through? 

 

From: main@ap-ug.groups.io <main@ap-ug.groups.io> On Behalf Of Jay Freeman via groups.io
Sent: Tuesday, February 23, 2021 12:57 PM
To: main@ap-ug.groups.io
Subject: Re: [ap-ug] Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"

 

I can (barely) remember when rotary phones would have been called "high-tech", except that the term had not been invented yet. Would you folks know what to do if you put a phone to your ear and heard someone saying "Number, please"? (Wouldn't that be a cute feature when opening a 'phone app?)

 

And there are still plenty of telescope mirrors that predate Roland's triplets, and even predate Roland, that are still doing yeoman duty today.

-- Jay Reynolds Freeman

---------------------
Jay_Reynolds_Freeman@...
http://JayReynoldsFreeman.com
(personal web site)



On Feb 23, 2021, at 12:41 PM, ROBERT WYNNE <robert-wynne@...> wrote:



Anyone seen a video of a millennial attempting to use a rotary phone for the  first time without instruction? Hilarious. What we take for granted is already lost to the ages. -Best, Robert

On 02/23/2021 12:27 PM James Stone <jrs7r@...> wrote:

 

 

It’s amazing how useful a Christen triplet from that era remains as compared other contemporary technological innovations such as the rotary dial telephone. Some things really do stand the test of time.


Re: Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"

Jay Freeman
 

I can (barely) remember when rotary phones would have been called "high-tech", except that the term had not been invented yet. Would you folks know what to do if you put a phone to your ear and heard someone saying "Number, please"? (Wouldn't that be a cute feature when opening a 'phone app?)

And there are still plenty of telescope mirrors that predate Roland's triplets, and even predate Roland, that are still doing yeoman duty today.

-- Jay Reynolds Freeman
---------------------
Jay_Reynolds_Freeman@...
http://JayReynoldsFreeman.com
(personal web site)

On Feb 23, 2021, at 12:41 PM, ROBERT WYNNE <robert-wynne@...> wrote:


Anyone seen a video of a millennial attempting to use a rotary phone for the  first time without instruction? Hilarious. What we take for granted is already lost to the ages. -Best, Robert
On 02/23/2021 12:27 PM James Stone <jrs7r@...> wrote:
 
 

It’s amazing how useful a Christen triplet from that era remains as compared other contemporary technological innovations such as the rotary dial telephone. Some things really do stand the test of time.


Re: Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"

ROBERT WYNNE
 

On 02/23/2021 12:40 PM ROBERT WYNNE <robert-wynne@...> wrote:
 
 
Anyone seen a video of a millennial attempting to use a rotary phone for the  first time without instruction? Hilarious. What we take for granted is already lost to the ages. -Best, Robert
On 02/23/2021 12:27 PM James Stone <jrs7r@...> wrote:
 
 

It’s amazing how useful a Christen triplet from that era remains as compared other contemporary technological innovations such as the rotary dial telephone. Some things really do stand the test of time.

 

From: <main@ap-ug.groups.io> on behalf of "Roland Christen via groups.io" <chris1011@...>
Reply-To: "main@ap-ug.groups.io" <main@ap-ug.groups.io>
Date: Tuesday, February 23, 2021 at 3:23 PM
To: "main@ap-ug.groups.io" <main@ap-ug.groups.io>
Subject: Re: [ap-ug] Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"

 

It's from a time when people actually looked thru a scope with things called eyepieces (and had telephones attached to walls, with rotary dials on them).

 

Rolando

 

 

 

-----Original Message-----
From: Pete Lardizabal <p14@...>
To: main@ap-ug.groups.io
Sent: Tue, Feb 23, 2021 1:52 pm
Subject: Re: [ap-ug] Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"

Many thanks James!

 

Read this long, long ago in a land far, far away. 

 

🤓

 

Pete



On Feb 23, 2021, at 2:03 PM, James Stone <jrs7r@...> wrote:

At long last, Sky & Telescope has granted permission for this article to be posted to the Astro-Physics user group. Permission is limited to this user group only. This copy of the article should not be redistributed and is for private use only. Hope the community enjoys reading this as much as I did.
Best,
James

<Apochromatic triplet objective article.pdf>

 


Re: Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"

ROBERT WYNNE
 

Anyone seen a video of a millennial attempting to use a rotary phone for the  first time without instruction? Hilarious. What we take for granted is already lost to the ages. -Best, Robert

On 02/23/2021 12:27 PM James Stone <jrs7r@...> wrote:
 
 

It’s amazing how useful a Christen triplet from that era remains as compared other contemporary technological innovations such as the rotary dial telephone. Some things really do stand the test of time.

 

From: <main@ap-ug.groups.io> on behalf of "Roland Christen via groups.io" <chris1011@...>
Reply-To: "main@ap-ug.groups.io" <main@ap-ug.groups.io>
Date: Tuesday, February 23, 2021 at 3:23 PM
To: "main@ap-ug.groups.io" <main@ap-ug.groups.io>
Subject: Re: [ap-ug] Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"

 

It's from a time when people actually looked thru a scope with things called eyepieces (and had telephones attached to walls, with rotary dials on them).

 

Rolando

 

 

 

-----Original Message-----
From: Pete Lardizabal <p14@...>
To: main@ap-ug.groups.io
Sent: Tue, Feb 23, 2021 1:52 pm
Subject: Re: [ap-ug] Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"

Many thanks James!

 

Read this long, long ago in a land far, far away. 

 

🤓

 

Pete



On Feb 23, 2021, at 2:03 PM, James Stone <jrs7r@...> wrote:

At long last, Sky & Telescope has granted permission for this article to be posted to the Astro-Physics user group. Permission is limited to this user group only. This copy of the article should not be redistributed and is for private use only. Hope the community enjoys reading this as much as I did.
Best,
James

<Apochromatic triplet objective article.pdf>

 


Re: Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"

James Stone
 

It’s amazing how useful a Christen triplet from that era remains as compared other contemporary technological innovations such as the rotary dial telephone. Some things really do stand the test of time.

 

From: <main@ap-ug.groups.io> on behalf of "Roland Christen via groups.io" <chris1011@...>
Reply-To: "main@ap-ug.groups.io" <main@ap-ug.groups.io>
Date: Tuesday, February 23, 2021 at 3:23 PM
To: "main@ap-ug.groups.io" <main@ap-ug.groups.io>
Subject: Re: [ap-ug] Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"

 

It's from a time when people actually looked thru a scope with things called eyepieces (and had telephones attached to walls, with rotary dials on them).

 

Rolando

 

 

 

-----Original Message-----
From: Pete Lardizabal <p14@...>
To: main@ap-ug.groups.io
Sent: Tue, Feb 23, 2021 1:52 pm
Subject: Re: [ap-ug] Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"

Many thanks James!

 

Read this long, long ago in a land far, far away. 

 

🤓

 

Pete



On Feb 23, 2021, at 2:03 PM, James Stone <jrs7r@...> wrote:

At long last, Sky & Telescope has granted permission for this article to be posted to the Astro-Physics user group. Permission is limited to this user group only. This copy of the article should not be redistributed and is for private use only. Hope the community enjoys reading this as much as I did.
Best,
James

<Apochromatic triplet objective article.pdf>


Re: Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"

Roland Christen
 

It's from a time when people actually looked thru a scope with things called eyepieces (and had telephones attached to walls, with rotary dials on them).

Rolando



-----Original Message-----
From: Pete Lardizabal <p14@...>
To: main@ap-ug.groups.io
Sent: Tue, Feb 23, 2021 1:52 pm
Subject: Re: [ap-ug] Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"

Many thanks James!

Read this long, long ago in a land far, far away. 

🤓

Pete

On Feb 23, 2021, at 2:03 PM, James Stone <jrs7r@...> wrote:

At long last, Sky & Telescope has granted permission for this article to be posted to the Astro-Physics user group. Permission is limited to this user group only. This copy of the article should not be redistributed and is for private use only. Hope the community enjoys reading this as much as I did.
Best,
James
<Apochromatic triplet objective article.pdf>


Re: Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"

Pete Lardizabal
 

Many thanks James!

Read this long, long ago in a land far, far away. 

🤓

Pete

On Feb 23, 2021, at 2:03 PM, James Stone <jrs7r@...> wrote:

At long last, Sky & Telescope has granted permission for this article to be posted to the Astro-Physics user group. Permission is limited to this user group only. This copy of the article should not be redistributed and is for private use only. Hope the community enjoys reading this as much as I did.
Best,
James
<Apochromatic triplet objective article.pdf>


Re: Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"

Chris Cook
 

Thanks James!
Rolando also has a article in the October 1985 S&T as well.
 
Chris
 


 

----- Original Message -----
From: James Stone <jrs7r@...>
Reply-To: <main@ap-ug.groups.io>
To: <main@ap-ug.groups.io>
Sent: 2/23/2021 2:02:44 PM
Subject: [ap-ug] Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"

At long last, Sky & Telescope has granted permission for this article to be posted to the Astro-Physics user group. Permission is limited to this user group only. This copy of the article should not be redistributed and is for private use only. Hope the community enjoys reading this as much as I did.
Best,
James


Re: Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"

thefamily90 Phillips
 

Great article! I actually remember reading it when it was first published! I was sold on AP triplets after that.

JimP


From: main@ap-ug.groups.io <main@ap-ug.groups.io> on behalf of R Botero via groups.io <rbotero@...>
Sent: Tuesday, February 23, 2021 2:10:01 PM
To: main@ap-ug.groups.io <main@ap-ug.groups.io>
Subject: Re: [ap-ug] Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"
 

Thank you James!
Who’s the young chap on page 2?! ;-)

Roberto


--
Jim Phillips


Re: Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"

R Botero
 

Thank you James!
Who’s the young chap on page 2?! ;-)

Roberto


Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective"

James Stone
 

At long last, Sky & Telescope has granted permission for this article to be posted to the Astro-Physics user group. Permission is limited to this user group only. This copy of the article should not be redistributed and is for private use only. Hope the community enjoys reading this as much as I did.
Best,
James


Re: Optimizing Quad TCC Backfocus Spacing

johnrogerjennings@...
 

Actually I have about 69 mm back focus from the front of the off-axis guider to the sensor glass / optical length. This should give me more space (19.1mm extra backspace) to prevent vignetting, but I've already ordered the shorter Precise Parts adapter. Hoping for an ok outcome here.


Re: [ap-gto] [ap-ug] Celestial Fireworks

Ross Elkins
 

Nice one Jim!

Ross


Re: Celestial Fireworks

Ross Elkins
 

Rolando,
That is an incredible result, send it to the APOD folks!

Rossmon


Re: Optimizing Quad TCC Backfocus Spacing

johnrogerjennings@...
 

I just received my TCC Quad. What a magnificent piece of glass! Kudos to the Master optician. 

What is the minimum distance from the back flange of the TCC to a 54mm male reducer that will not cause vignetting for a full frame sensor, assuming no other restrictions?

54mm is the female thread on the front of the QHY medium off axis guider (and filter wheel) which is attached to my QHY 2 inch filter wheel. I'm having a 22.1mm length adapter spacer fabricated by Precise Parts that goes from the 3.27" on the TCC Quad  flange to M54 male to screw into the off axis guider. I've started to worry about vignetting as an after thought. It's on an upgraded  AP130GT f6.3 Star Fire with 3.5" focuser. I have the QHY 54mm adapter kit that will allow shimming to the exact backspacing needed. I've already calculated with my QHY268C that I have about 5mm to play with for adding additional spacers to the 22.1 mm adapter/spacer. While vignetting may not occur on the APS-C sensor, I'll be getting a full frame camera soon.

John J.

If there are any stock combination adapter/reducers made by AP or otherwise that goes to M54 from 3.27", please let me know. I have not found anything in my searching of all vendors except the Badder adapter that goes from 3.27" to M68.


Re: Stowaway Doveloc Adapter

Roland Christen
 

They are for locking it into place.

Rolando



-----Original Message-----
From: M Hambrick <mhambrick563@...>
To: main@ap-ug.groups.io
Sent: Tue, Feb 23, 2021 7:17 am
Subject: [ap-ug] Stowaway Doveloc Adapter

Two questions:

Are the three small setscrews on the back of the Stowaway Doveloc adapter just for locking the ring in place (see photo), or do they serve as some kind of push / pull function for tilt adjustment ?

Can I assume that the Doveloc adapter ring is just threaded onto the back of the Stowaway focuser barrel ?

Mike


Re: Stowaway Doveloc Adapter

Dale Ghent
 

These kinds of set screws are common to Starlight drawtube adapters, and in my experience they are there just to prevent the adapter from unscrewing. They've never struck me as a form of tilt adjustment because that's really not possible considering the adapter is threaded on and there's no real play.

On Feb 23, 2021, at 08:17, M Hambrick <mhambrick563@gmail.com> wrote:

Two questions:

Are the three small setscrews on the back of the Stowaway Doveloc adapter just for locking the ring in place (see photo), or do they serve as some kind of push / pull function for tilt adjustment ?

Can I assume that the Doveloc adapter ring is just threaded onto the back of the Stowaway focuser barrel ?

Mike

<dummyfile.0.part>


Stowaway Doveloc Adapter

M Hambrick
 

Two questions:

Are the three small setscrews on the back of the Stowaway Doveloc adapter just for locking the ring in place (see photo), or do they serve as some kind of push / pull function for tilt adjustment ?

Can I assume that the Doveloc adapter ring is just threaded onto the back of the Stowaway focuser barrel ?

Mike


Re: [ap-gto] [ap-ug] Celestial Fireworks

Roland Christen
 

That is one nice image of Jupiter! Thanks for posting

Roland


-----Original Message-----
From: thefamily90 Phillips <thefamily90@...>
To: main@ap-gto.groups.io <main@ap-gto.groups.io>; main@ap-ug.groups.io <main@ap-ug.groups.io>
Cc: main@ap-gto.groups.io <main@ap-gto.groups.io>
Sent: Mon, Feb 22, 2021 7:29 pm
Subject: Re: [ap-gto] [ap-ug] Celestial Fireworks

I’ve got one of those original AP 10” F/14.6 Maksutovs. Great for lunar and planetary imaging also.

AP 10”
Damian Peach, Dave Tyler, Jim Phillips

Image.jpeg


From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Pete Lardizabal <p14@...>
Sent: Monday, February 22, 2021 8:16:22 PM
To: main@ap-ug.groups.io <main@ap-ug.groups.io>
Cc: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] [ap-ug] Celestial Fireworks
 
“BAM!”

😎

Pete

On Feb 22, 2021, at 7:57 PM, Roland Christen via groups.io <chris1011@...> wrote:


With the lousy weather this February I decided to reprocess a couple of images taken back in 2011. Can't get decent skies this week or next according to long term weather outlook.
This image was taken with my original 10" F14.6 Mak-Cass. Who says you have to shoot at F5 to get anything. This is with my old STL11K camera, which is still working great.

https://www.astrobin.com/n5nn5a/

Rolando

--
Jim Phillips


Re: [ap-gto] [ap-ug] Celestial Fireworks

thefamily90 Phillips
 

I’ve got one of those original AP 10” F/14.6 Maksutovs. Great for lunar and planetary imaging also.

AP 10”
Damian Peach, Dave Tyler, Jim Phillips

Image.jpeg


From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Pete Lardizabal <p14@...>
Sent: Monday, February 22, 2021 8:16:22 PM
To: main@ap-ug.groups.io <main@ap-ug.groups.io>
Cc: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] [ap-ug] Celestial Fireworks
 
“BAM!”

😎

Pete

On Feb 22, 2021, at 7:57 PM, Roland Christen via groups.io <chris1011@...> wrote:


With the lousy weather this February I decided to reprocess a couple of images taken back in 2011. Can't get decent skies this week or next according to long term weather outlook.
This image was taken with my original 10" F14.6 Mak-Cass. Who says you have to shoot at F5 to get anything. This is with my old STL11K camera, which is still working great.

https://www.astrobin.com/n5nn5a/

Rolando

--
Jim Phillips

921 - 940 of 85271