Go Back   IceInSpace > Equipment > Eyepieces, Barlows and Filters

Reply
 
Thread Tools Rate Thread
  #1  
Old 13-05-2019, 01:18 AM
Ukastronomer (Jeremy)
Feel free to edit my imag

Ukastronomer is offline
 
Join Date: Jan 2019
Location: Llandysul, WALES, UK
Posts: 1,381
Can anyone tell me what this is please

1.25"
Looks like the end of a barlow but longer than another I have
I did buy a "magnimax" years ago ??

Nothing written on it.

Also where in the chain do you place a focal reducer when you have scope, diagonal, quark, eyepiece

Thank you
Attached Thumbnails
Click for full-size image (Dscn0363.jpg)
35.1 KB38 views
Click for full-size image (Dscn0364.jpg)
34.0 KB50 views
Click for full-size image (Dscn0365.jpg)
34.7 KB32 views
Reply With Quote
  #2  
Old 13-05-2019, 07:58 AM
mental4astro's Avatar
mental4astro (Alexander)
kids+wife+scopes=happyman

mental4astro is offline
 
Join Date: Jun 2008
Location: sydney, australia
Posts: 4,979
Hi Jeremy,

I'd say that looks like a barlow lens. My GSO barlow has a lens that looks just like that one - see pic below. Wind it into an eyepiece and see what happens - BUT DO NOT FIT IT ONTO THE END OF THE QUARK.

If you have one of those 1.25" focal reducers, you also wind it into the eyepiece and then the whole lot into the Quark. Do not fit the reducer onto the end of the Quark.

The reasons for not placing it onto the end of the Quark are 1, the light entering that lens may be too intense and cause it to heat up, 2, the location of the reducer will mean you won't have enough in-travel with the focuser even if the lens did not heat up.

I often use my 1.25" reducer with my Quark, and always by winding it onto the end of the eyepiece. Sometimes I also replace the barlow lens with the reducer lens of the barlow tube assembly to get an even greater magnification reduction. But be aware that this does not really give you a wider true field of view as this is governed by the aperture of the Quark itself. The magnification reduction the focal reducer provides will concentrate the image into a smaller size, which can help make it easier to see some details.

My "Quark kit" contains 25mm and 32mm plossls, a 1.25" focal reducer, & the tube of a shorty barlow sans the barlow lens. I also make use of the aperture stop cover that the scope's dust cover comes with as stopping down the aperture of the scope is another useful tool. I will often use all of these during a session with my Quark and ED80.

Alex.
Attached Thumbnails
Click for full-size image (2X-Barlow-GSO-single.jpg)
50.2 KB17 views
Reply With Quote
  #3  
Old 13-05-2019, 03:33 PM
raymo
Registered User

raymo is offline
 
Join Date: Sep 2011
Location: margaret river, western australia
Posts: 6,070
I can't quite see the whole object in your pic, but some eyepieces come with a barlow supplied. My 2" 30mm UWA comes with a 1.5x barlow attached.
raymo
Reply With Quote
  #4  
Old 13-05-2019, 04:40 PM
Ukastronomer (Jeremy)
Feel free to edit my imag

Ukastronomer is offline
 
Join Date: Jan 2019
Location: Llandysul, WALES, UK
Posts: 1,381
Quote:
Originally Posted by raymo View Post
I can't quite see the whole object in your pic, but some eyepieces come with a barlow supplied. My 2" 30mm UWA comes with a 1.5x barlow attached.
raymo
The whole object is in the photo, sorry, it is next to a quark

Many thanks all
Attached Thumbnails
Click for full-size image (Dscn0364.jpg)
38.1 KB32 views
Reply With Quote
  #5  
Old 13-05-2019, 04:41 PM
Ukastronomer (Jeremy)
Feel free to edit my imag

Ukastronomer is offline
 
Join Date: Jan 2019
Location: Llandysul, WALES, UK
Posts: 1,381
Quote:
Originally Posted by mental4astro View Post
Hi Jeremy,

I'd say that looks like a barlow lens. My GSO barlow has a lens that looks just like that one - see pic below. Wind it into an eyepiece and see what happens - BUT DO NOT FIT IT ONTO THE END OF THE QUARK.

If you have one of those 1.25" focal reducers, you also wind it into the eyepiece and then the whole lot into the Quark. Do not fit the reducer onto the end of the Quark.

The reasons for not placing it onto the end of the Quark are 1, the light entering that lens may be too intense and cause it to heat up, 2, the location of the reducer will mean you won't have enough in-travel with the focuser even if the lens did not heat up.

I often use my 1.25" reducer with my Quark, and always by winding it onto the end of the eyepiece. Sometimes I also replace the barlow lens with the reducer lens of the barlow tube assembly to get an even greater magnification reduction. But be aware that this does not really give you a wider true field of view as this is governed by the aperture of the Quark itself. The magnification reduction the focal reducer provides will concentrate the image into a smaller size, which can help make it easier to see some details.

My "Quark kit" contains 25mm and 32mm plossls, a 1.25" focal reducer, & the tube of a shorty barlow sans the barlow lens. I also make use of the aperture stop cover that the scope's dust cover comes with as stopping down the aperture of the scope is another useful tool. I will often use all of these during a session with my Quark and ED80.

Alex.

WOW OK then, won't do that, thank you
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

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 02:13 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Advertisement
Testar
Advertisement
Bintel
Advertisement