10KL
super member
Reged: 11/10/05
|
Baader Maxbright's glasspath options
#4427535 - 03/05/11 09:47 AM
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
I recently picked up a baader maxbright with a 2.6x glasspath compensator. I also have some 17-18mm ep pairs lined up, but have not had a chance to take anything out for their first light just yet. so here are my questions:
1) do these glasspath compensators act exactly like a barrow with respect to the eps?
2) if above is, in fact, the case, should I just pick up the other two 1.25x and 1.7x glasspath compensators instead of buying additional ep pairs. I figured that at $99 each, it would make it cheaper and more convenient than buying additional ep pairs. but what do I know. 
|
dweller25
Pooh-Bah
Reged: 08/30/07
Loc: Lancashire, UK
|
Re: Baader Maxbright's glasspath options
[Re: 10KL]
#4427731 - 03/05/11 11:17 AM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
1) yes, plus they correct some optical aberrations created by prisms.
2) yes, that makes sense if you have the right eyepieces.
|
10KL
super member
Reged: 11/10/05
|
Re: Baader Maxbright's glasspath options
[Re: dweller25]
#4428338 - 03/05/11 04:09 PM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
thanks for the response, David.
after reading some posts here on CN and doing some light research, i have narrowed it down to 18mm baader genuine ortho and 17mm hyperion. the latter may be changed at some point to 21mm, and i am planning on getting two tuning rings either way. i figured that despite all the valuable feedback, the best approach is still to try it out myself.
i am also thinking of getting a pair of ES 14mm 82° before the sale ends, just to see how it performs in my bino setup. worst case scenario, i'll sell one and keep the other for the typical mono approach.
|
dweller25
Pooh-Bah
Reged: 08/30/07
Loc: Lancashire, UK
|
Re: Baader Maxbright's glasspath options
[Re: 10KL]
#4429459 - 03/06/11 03:13 AM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
I think one of the advantages of using two eyes is that you don't need premium eyepieces. I use BGO's and TV Plossls and get excellent results.
|
10KL
super member
Reged: 11/10/05
|
Re: Baader Maxbright's glasspath options
[Re: dweller25]
#4431351 - 03/06/11 11:57 PM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
part of me completely agrees with you. following my bino purchase, i was suggested to get orthos and plossls. and considering that TV is having a sale, i almost pulled a trigger on a pair of 20mm or 15mm ones. the only problem is their somewhat narrow fov, which is why i am going to try the hyperions as well as a 9mm b/tmb (want to see how the latter works when i hit it with a 1.7x glasspath). i am really giddy to actually try eps out myself side-by-side and then sell the ones i do not want, so i still may purchase a pair of tv plossls after all. thank you for the tip.
|
M13 Observer
professor emeritus
Reged: 12/09/06
|
Re: Baader Maxbright's glasspath options
[Re: 10KL]
#4436493 - 03/09/11 12:22 AM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
Quote:
I recently picked up a baader maxbright with a 2.6x glasspath compensator. I also have some 17-18mm ep pairs lined up, but have not had a chance to take anything out for their first light just yet. so here are my questions:
1) do these glasspath compensators act exactly like a barrow with respect to the eps?
2) if above is, in fact, the case, should I just pick up the other two 1.25x and 1.7x glasspath compensators instead of buying additional ep pairs. I figured that at $99 each, it would make it cheaper and more convenient than buying additional ep pairs. but what do I know.
Yes and no. Yes the Glasspath compensators will work like Barlows but there are two problems with this approach. Changing compensators is not a really simple process like changing eyepieces or changing Barlows; and the focus point shifts with a change in compensators. It is still best to choose the compensator required for the viewing you are doing and the in-travel you require with your specific optical configuration and then change eyepieces to vary the magnification. The 2.6X compensator allows for the most in-travel. Changing to the 1.7x and you lose about 35mm of in-travel and the 1.25x an additional 15mm. You may not be able to reach focus if the telescope you are using does not have sufficient back-focus.
|
10KL
super member
Reged: 11/10/05
|
Re: Baader Maxbright's glasspath options
[Re: M13 Observer]
#4438114 - 03/09/11 06:19 PM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
agreed, Observer. i thought about the potential fumbling i would have to endure while swapping the compensators back and forth. and while i am not going to spring for a 1.25x, i am seriously considering at least a 1.7x in addition to my 2.6x. i will definitely heed your warning regarding a possible problem with focusing while using the former, as well as a need to refocus every time i swap the two. i think that the best (and most fun) approach for me is still trial-and-error. as i mentioned earlier, i am in the process of getting a number of pairs in the 14mm-21mm range.
|
dw310
member
Reged: 08/10/10
|
Re: Baader Maxbright's glasspath options
[Re: 10KL]
#5341479 - 07/29/12 11:13 AM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
I'm bumping this thread, as I'm not sure how to figure out which glasspath compensator would be best for my scope.
I have the WO FLT 110 fl 770 and A-P Maxbright star diagonal (optical path 4.1"= 104.14mm). Is there some formula to help me figure out the best glass path compensator?
|
dw310
member
Reged: 08/10/10
|
Re: Baader Maxbright's glasspath options
[Re: dw310]
#5341649 - 07/29/12 01:23 PM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
Never mind. Found it on Alpine Astro's site
glasspath compensator info
|
Gordon Rayner
Carpal Tunnel
Reged: 03/24/07
|
Re: Baader Maxbright's glasspath options
[Re: M13 Observer]
#5341786 - 07/29/12 02:50 PM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
I am a newebie with binoviewers. How do those glasspath compensators work?
IIRC, glass blocks such as prisms introduce negative spherical and chromatic abb. See Selby in original ATM III publication by Scientific American, or someplace in the current, re-arranged books from Willmann-Bell. "Aberrations of the prism diagonal".
If a (negative) Barlow inputs more negative abbs,( is this correct?) this would add more negative signed abb. , rather than neutralize the abb. from the long glass paths in the binoviewer.
???
|
Astrojensen
Post Laureate
Reged: 10/05/08
Loc: Bornholm, Denmark
|
Re: Baader Maxbright's glasspath options
[Re: dw310]
#5341868 - 07/29/12 03:49 PM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
Quote:
I have the WO FLT 110 fl 770 and A-P Maxbright star diagonal (optical path 4.1"= 104.14mm). Is there some formula to help me figure out the best glass path compensator?
You've already found help, but I'll add that if you ditch the 2" diagonal and get a Baader T2 diagonal, you might be able to reach focus with NO GPC at all or at most only the 1.25x one. I have a WO 72 Megrez apo and can reach focus with ALL eyepieces with just the 1.25x GPC in the T2 Zeiss prism. Some of my UO orthos can reach focus with no GPC! If I change the focuser to the much shorter Kasai Trading Crayford, I can reach focus with ALL eyepieces AND NO GPC, even in the T2 amici prism!!!!! Correct-reading images from 10.5x and upwards! What's not to like?
Clear skies!
Thomas, Denmark
|
azure1961p
Postmaster
Reged: 01/17/09
Loc: USA
|
Re: Baader Maxbright's glasspath options
[Re: dweller25]
#5353869 - 08/05/12 09:54 PM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
Quote:
I think one of the advantages of using two eyes is that you don't need premium eyepieces. I use BGO's and TV Plossls and get excellent results.
Those ARE excellent eyepieces. Your kidding right?
Pete
|
JoeM101
scholastic sledgehammer
Reged: 04/09/12
Loc: 45.66086, -73.54702
|
Re: Baader Maxbright's glasspath options
[Re: azure1961p]
#5353965 - 08/05/12 11:11 PM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
I have an SV102ED i'd like to use a binoviewer with and was thinking of getting the Baader 2" Clicklock Mirror Star Diagonal, with the Baader - Maxbright Binocular w/ Glasspath and Nosepiece 1.25 Corrector, so my question is, will this work or do i have to consider anything else when using with this particular scope?
|
Astrojensen
Post Laureate
Reged: 10/05/08
Loc: Bornholm, Denmark
|
Re: Baader Maxbright's glasspath options
[Re: JoeM101]
#5354261 - 08/06/12 04:46 AM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
I think you should get a Baader T2 prism instead of the 2" Clicklock. I am 99% sure you will be able to reach focus with the Maxbright, T2 prism and 1.25x GPC, but I am not sure at all that this will be the case with the much, much bigger 2" diagonal.
Clear skies!
Thomas, Denmark
|
JoeM101
scholastic sledgehammer
Reged: 04/09/12
Loc: 45.66086, -73.54702
|
Re: Baader Maxbright's glasspath options
[Re: Astrojensen]
#5354290 - 08/06/12 05:47 AM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
Quote:
I think you should get a Baader T2 prism instead of the 2" Clicklock. I am 99% sure you will be able to reach focus with the Maxbright, T2 prism and 1.25x GPC, but I am not sure at all that this will be the case with the much, much bigger 2" diagonal.
Clear skies!
Thomas, Denmark
Thomas, Baader T2 Prism can be configured with the 2" clicklock and 2" nosepiece for 2" focuser and 2" EPs.. you think this configuration with the Maxbright bino w/1.25 corrector will do the job?
|
JoeM101
scholastic sledgehammer
Reged: 04/09/12
Loc: 45.66086, -73.54702
|
Re: Baader Maxbright's glasspath options
[Re: JoeM101]
#5354383 - 08/06/12 08:22 AM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
just a quick followup, been reading into this a little and found that most people actually recommend the mirror as opposed to the prism... generally speaking , it is said that the prism introduces spherical aberrations and loss of aperture.. having a hard time with this....
perhaps the T2 star diagonal might do?? 
Edited by JoeM101 (08/06/12 08:26 AM)
|
tomcody
professor emeritus
Reged: 07/06/08
Loc: Titusville, Florida
|
Re: Baader Maxbright's glasspath options
[Re: JoeM101]
#5354475 - 08/06/12 09:22 AM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
Quote:
just a quick followup, been reading into this a little and found that most people actually recommend the mirror as opposed to the prism... generally speaking , it is said that the prism introduces spherical aberrations and loss of aperture.. having a hard time with this....
perhaps the T2 star diagonal might do??
As the Glass Path correctors fit into the top of the diagonal , I suggest the T-2 series instead of the 2" Clicklock (not sure the correctors will fit into the top of the 2' diagonal correctly?) Also with the 23MM - 24mm clear opening of the binoviwers, you do not need the extra size of the 2" diagonal.
Rex
|
JoeM101
scholastic sledgehammer
Reged: 04/09/12
Loc: 45.66086, -73.54702
|
Re: Baader Maxbright's glasspath options
[Re: tomcody]
#5354805 - 08/06/12 01:06 PM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
what if i want to go lone 2" EP... won't the T-2 cut into the aperture?
|
Astrojensen
Post Laureate
Reged: 10/05/08
Loc: Bornholm, Denmark
|
Re: Baader Maxbright's glasspath options
[Re: JoeM101]
#5354926 - 08/06/12 02:30 PM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
Quote:
what if i want to go lone 2" EP... won't the T-2 cut into the aperture?
It will, depending on the field stop diameter of the eyepiece. My 42mm GSO Kellner is definitely vignetted, for example. The T-2 prism diagonals are made with shortest possible light path in mind, for binoviewer use with the lowest possible barlowing needed to reach focus.
The T-2 prism diagonal + Baader Maxbright bino requires about 145mm back focus. A 2" diagonal + Maxbright w/2" nosepiece will need about 210mm+ (working a bit from memory here, but the figures aren't far off). That's a huge difference. A 1.25x GPC will subtract 20mm from these figures, a 1.7x GPC 40mm, the 2.6x GPC 60mm. It is easy to see that the Maxbright with T-2 prism and NO GPC will need LESS back focus than the Maxbright in a 2" diagonal WITH 2.6x GPC!! This means you will be able to use much lower magnifications, and believe me, you will want to do that! Low power binoviewer views are awesome!
Unless your scope is one of those with a removable 4" long section to allow binoviewer use with a 2" diagonal, I strongly recommend the T-2 diagonal.
And I personally strongly prefer prism diagonals over mirrors, when it comes to critical lunar-planetary observing. My Baader Maxbright 2" diagonal has visibly more scatter than my Baader T-2 prism diagonal with Zeiss prism. Prisms introduce overcorrection when used with scopes with fast f/ratios, but this is nothing to be afraid of, since you won't see it at low power anyway and at high power you use a GPC, which takes care of it nicely, with its build-in correction.
Clear skies!
Thomas, Denmark
|
JoeM101
scholastic sledgehammer
Reged: 04/09/12
Loc: 45.66086, -73.54702
|
Re: Baader Maxbright's glasspath options
[Re: Astrojensen]
#5355035 - 08/06/12 04:01 PM
|
|
Edit
|
Reply
|
Quote |
Quick Reply
|
|
|
Thomas: Thanks for the info... very insightful.
I have 2 refractors i would like to use this with and neither has that extra 4 inch piece you are talking about. Though Stellarvue makes scopes with a designation BV, this SV102ED is not one of them. The scope is an f/6.95 with 3 inches (76mm) of travel on the drawtube, the other is an AstroTech AT72 f/6 with 80mm of travel...
my lowest mag EP is a TV Nagler 17mm i just picked up and i'm waiting for an ES 24mm, these are both 2".
I plan on using a pair of the Baader Hyperion 8-24mm Clickstop Zoom Including 2" Barrel - Mark III with the Bino as i already have 1 Baader 2.25x zoom barlow and will get another
clear skies
Edited by JoeM101 (08/06/12 04:04 PM)
|
Previous
Index
Next
Threaded
