Jump to content

sgl_imaging_challenge_banner_31.thumb.jpg.b7a41d6a0fa4e315f57ea3e240acf140.jpg

Recommended Posts

While looking into the Nikon EiS 1.6x Barlow, designed primarily to go with NAV SW eye pieces, I found this pictorial  comparison linked to by the knowledgeable Don Pensack.

158640774.H0ahXeeJ.barlow.jpg

Link to post
Share on other sites

Richard, what is a Baader 1.8x Recenter?

Do you have particular aims for your kit collection? What are you trying to achieve?

Link to post
Share on other sites

Without any additional information I'm not sure we can read too much into that comparison. How were the images created? Why do they all show the same grid pattern? If it was scatter you would expect blurring of each point but it looks a lot like the same thing magnified different amounts by different barlows. 

Link to post
Share on other sites
5 hours ago, Stu said:

Richard, what is a Baader 1.8x Recenter?

Do you have particular aims for your kit collection? What are you trying to achieve?

It is a glass path corrector https://www.astroshop.eu/optical-accessories/baader-2-1-8x-glasspath-corrector-front-side-with-2-filter-thread-/p,10824?utm_medium=cpc&utm_term=10824&utm_campaign=1807&utm_source=froogle&gclid=CjwKCAjw7IbaBRBqEiwA6AyZgm-A-l75HoMq78YcuSOa6D4I1QplMKFLhM_q6UbVU46DKvz8ZoRn6BoCrgAQAvD_BwE&utm_content= but seems dedicated to Baader bino viewers.

I have a Nikon 17.5mm NAV SW, hence my curiosity about the EiC. Good lightweight travel combo prime and (almost) 11mm with EiC. The latter might work with my TS bino viewer as a GPC as well.

Edited by 25585
Link to post
Share on other sites
5 hours ago, Ricochet said:

Without any additional information I'm not sure we can read too much into that comparison. How were the images created? Why do they all show the same grid pattern? If it was scatter you would expect blurring of each point but it looks a lot like the same thing magnified different amounts by different barlows. 

It is, by 11 different Barlows showing the scatter each one has I presume.

Link to post
Share on other sites
6 hours ago, 25585 said:

It is a glass path corrector https://www.astroshop.eu/optical-accessories/baader-2-1-8x-glasspath-corrector-front-side-with-2-filter-thread-/p,10824?utm_medium=cpc&utm_term=10824&utm_campaign=1807&utm_source=froogle&gclid=CjwKCAjw7IbaBRBqEiwA6AyZgm-A-l75HoMq78YcuSOa6D4I1QplMKFLhM_q6UbVU46DKvz8ZoRn6BoCrgAQAvD_BwE&utm_content= but seems dedicated to Baader bino viewers.

I have a Nikon 17.5mm NAV SW, hence my curiosity about the EiC. Good lightweight travel combo prime and (almost) 11mm with EiC. The latter might work with my TS bino viewer as a GPC as well.

How does it differ from the Baader x1.8 also shown?

Have you looked through your kit? What do you think of it?

Link to post
Share on other sites
4 hours ago, Stu said:

How does it differ from the Baader x1.8 also shown?

Have you looked through your kit? What do you think of it?

Less scatter (and from the Nikon) going by the illustrations. But I was only thinking about the Eic. 

The extender on my Tak DL works with bino viewers, and my SCT does not need any GP optic. Equinoxes 66 and 80 do. All my 1.25 Barlows are 2x or more, a smaller magnification one would be welcome. 

Edited by 25585
Link to post
Share on other sites
2 hours ago, 25585 said:

Less scatter (and from the Nikon)

I may be missing the point (or in fact may be stating the blinindgly obvious), but it seems like the Baader x1.8 recenter is just a corrected ie realigned Baader x1.8. You can’t buy a x1.8 recenter.....

The AP Barcon (which I have) comes out well which backs up my experience looking through one regularly.

There is more to it than just magnification, the GPCs correct for some of the abberation introduced by binoviewers so a x1.25 GPC can be worth using.

Link to post
Share on other sites
29 minutes ago, Stu said:

I may be missing the point (or in fact may be stating the blinindgly obvious), but it seems like the Baader x1.8 recenter is just a corrected ie realigned Baader x1.8. You can’t buy a x1.8 recenter.....

The AP Barcon (which I have) comes out well which backs up my experience looking through one regularly.

There is more to it than just magnification, the GPCs correct for some of the abberation introduced by binoviewers so a x1.25 GPC can be worth using.

My Zeiss Abbe Barlow and ES extender are both good at that. Not tried the BV on my DL without the latter's extender (which is only that, not a Barlow).

I would expect an AP Baron to do well ☺ 

 

Link to post
Share on other sites
Just now, 25585 said:

Not tried the BV on my DL

Well worth a go. I almost exclusively Binoview at high powers for planets and lunar these days. Give it a go and let us know how you get on. 

Link to post
Share on other sites
2 hours ago, Stu said:

Well worth a go. I almost exclusively Binoview at high powers for planets and lunar these days. Give it a go and let us know how you get on. 

Will do ☺ 

Link to post
Share on other sites

It's well worth having a look at the full CN thread that the images posted at the start of this thread came from. It shows the method and equipment used, the results for a number of eyepieces as well as the barlows and some useful discussion of the results. I don't think it's a clear cut situation myself. Some of the eyepiece results are quite surprising and may be different to what might be expected or even what observers have experienced in the field ?

https://www.cloudynights.com/topic/485759-laser-scatter-test/

So, interesting, but not necessarily conclusive perhaps ?

  • Like 1
Link to post
Share on other sites

I am not so sure what the experiment is showing and I lean toward coatings. One certainty  is Tammy sure has lots of great eyepieces ?

  • Like 2
Link to post
Share on other sites
20 hours ago, John said:

It's well worth having a look at the full CN thread that the images posted at the start of this thread came from. It shows the method and equipment used, the results for a number of eyepieces as well as the barlows and some useful discussion of the results. I don't think it's a clear cut situation myself. Some of the eyepiece results are quite surprising and may be different to what might be expected or even what observers have experienced in the field ?

https://www.cloudynights.com/topic/485759-laser-scatter-test/

So, interesting, but not necessarily conclusive perhaps ?

It's like bench tests v reality use. Same with hi fi, TVs etc. The atmosphere and weather are the biggest light scatterers of all. In a perfect environment, no man made creation would be perfect. 

I can see how observatory choices of optics might be interested in the scatter results though.  

Link to post
Share on other sites
1 hour ago, 25585 said:

It's like bench tests v reality use. Same with hi fi, TVs etc. The atmosphere and weather are the biggest light scatterers of all. In a perfect environment, no man made creation would be perfect. 

I can see how observatory choices of optics might be interested in the scatter results though.  

I think I remain more interested by what happens when I look through things :)

  • Like 1
Link to post
Share on other sites
6 minutes ago, Stu said:

I think I remain more interested by what happens when I look through things :)

I agree. If we went by such tests, we wouldn't buy any. 

Link to post
Share on other sites

Interesting CN article - to a point. If you have the pristine, dry and stable desert skies that many CN members seem to enjoy, fair enough. But here in the UK we rarely get anything approaching that - so I tend not to read those "micro analysing" reviews and concentrate on what the Jetstream deems fit for us to look at!?

 

Dave

  • Like 2
Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By Corpze
      Hi, i have made a video where i show a coople of eyepieces that i use and like, and also show how a barlow works, compared to the "Powermate" from Televue. And how is the FOV affected when changing the magnification with different eyepieces?

      Feel free to comment and give me feedback - I hope you like the video!
      /Daniel
       
       
    • By Zermelo
      I picked up a Celestron Omni last year quite cheaply and had originally been using that with stock eyepieces, which was fine.
      Since then I've bought a couple of BST Starguiders and a Hyperflex zoom, and I'm now wondering if I'd notice any difference with a better barlow (this is now being used on an F/5 150mm Newtonian). Otherwise, the pennies can be directed elsewhere.
      I'd not considered it before as the next rung up seemed to be around the £90-£100 mark, which seemed out of line with the rest of the spend. But I've seen some positive reviews of 3-element models in the region of £35-£40.
      In particular, I've read good things about the Revelation/GSO Astro 2.5x (though apparently closer to 2.2x) and the Baader Classic Q 2.25x.
      - does anyone have experience with both of these, and have a preference?
      - would I notice any significant difference with either, compared with the Omni?
      - I read somewhere that the Baader in particular required focussing the tube into the OTA to an extent that caused some image degradation. Obviously I'd want to avoid this if true, so is this a feature of the Baader, or of both, or of all (shorter?) barlows? (to be honest, I'd not thought to see whether this was happening with the Omni, I'll try to remember to check, if this weather ever breaks).
      Thanks in advance.
    • By LondonSi72
      Hi SGL,
      My lovely wife bought me a SW Explorer 130 with the basic RA drive for my 40th birthday 8 years ago, and I've enjoyed using it on and off ever since.  I've started getting more into it - it's a great beginner scope, but I'm - like lots of others on this forum - looking at upgrading.  One of the things I found tricky with the scope was getting the focus just right at high magnification (I'm sure that's kind of obvious!).  It does wobble quite a bit on the EQ2 mount when focusing.  I get pretty good - if small - views of Jupiter, Saturn, (the Moon, of course) and have had hints of seeing some DSOs.
      I bought a 8mm BST Starguider, and it's a great improvement on the standard 10mm that comes with the scope, but if I push the scope by adding the 2x Barlow and the 8mm it's a blur and the focus seems to keep missing the sweet spot.  I saw a post elsewhere on this forum by MakTheNight, (looks like they've left now - last post was 2 years ago) who added a Baader Helical Focuser that attached directly to the T-thread on the focusing apparatus on the SW. Link to that post is below. I got one and it is indeed a great improvement on fine tuning - the problem is I can't use it with the Barlow as the helical focuser is about an inch long and the focuser can't move far enough into the scope to focus with the Barlow and any of my eyepieces (the 8mm BST, or the 10 or 25mm standard eyepieces)
      .
      Clearly MakTheNight managed to get their setup to work with some specific eyepieces (a Luminos 10mm and 32mm Plossl) and a specific Barlow, so I tried looking up how I could work out what combination of eyepieces and Barlow would work, rather than randomly buying kit and having to return it because it won't work with my scope, but I haven't found anything useful yet.  So I thought I'd take the plunge and ask here

      Can anyone help me figure out how I can calculate what combinations of eyepiece and Barlow would work with this setup?  I'm also looking at upgrading the OTA and mount to a 200P and EQ5 at some point, so ideally would have a combination that could work with that too - the focal length and mirror is quite different - 1000mm on the 200P parabolic vs 900mm spherical on the 130.
       
      Many thanks!
      Simon
       
       
    • By StarGazingSiouxsie
      Hi  
      Tonight I was looking at Jupiter and got some nice views with a range of eyepeices. The best image detail wise and for clarity of image was a 15mm, which on my 8" Evolution gives me appx 135X 
      I tried using my Televue 2X Barlow which normally works fine. I can't remember exactly which eyepiece this happened with, maybe the 15mm or a 9mm, but when I used the barlow the planetary image would soon disappear out of the eyepiece. The mount seemed to otherwise be tracking OK although notice the planets seem to move out of the eyepiece view after a while. So did I have too much magnification with the Barlow? I think I did manage to get focus, the image just wouldn't stay put.
      Thanks for any insights or advice 
       
      Siouxsie 
    • By Ryaen
      Hi, I am pretty much new in Astronomy. Recently I have bought Meade Polaris 127mm telescope. The Barlow(2x) which Meade has provided is pretty basic. It gives pretty blurry view.
      I have read few blogs and get to know that for 127mm, 2x-3x magnification is more than enough. Now I’m confused in its specs(element in it).
      Wondering which one I choose, 2.5x Barlow 3 element or 2x Barlow with 2 element to get clear and crisp viewing.
      Ryaen
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.