Return to the Cloudy Nights Telescope Reviews home pageAstronomics discounts for Cloudy Nights members
· Get a Cloudy Nights T-Shirt · Submit a Review / Article

Click here if you are having trouble logging into the forums

Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User

Equipment Discussions >> Binoviewers

Pages: 1 | 2 | (show all)
Fogboundturtle
professor emeritus


Reged: 05/20/09

Loc: Burnaby, BC
Binotron-27 - That was it for me
      #5694434 - 02/22/13 10:55 AM

Order has been placed. Order with the Lunt adapter and the D21 eyepieces. I was looking for setup that would work with all my scope but most of all for solar viewing. The binotron-27 did it for me.

I guess I'll know in 2 months whether I made a mistake or not.


Post Extras: Print Post   Remind Me!   Notify Moderator  
rockethead26
Carpal Tunnel
*****

Reged: 10/21/09

Loc: Arizona, USA
Re: Binotron-27 - That was it for me new [Re: Fogboundturtle]
      #5694543 - 02/22/13 11:53 AM

I doubt you made a mistake. The Denks work well in my Lunt 60 solar scope, my f/4.4 dob and my f/7.5 refractor.

I ordered my Denks a few weeks before the Binotrons were announced, so I missed that opportunity, but I'm very happy with what I have.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Mauikj
member


Reged: 06/08/08

Loc: Maui, Hawaii, USA
Re: Binotron-27 - That was it for me new [Re: Fogboundturtle]
      #5706601 - 03/01/13 04:48 AM

Hey there,

I dont have a lot of experience with binoviewers, I only had some Burgess ones I bought a few years back that were OK for solar but not really high quality. I got my Binotrons about a month ago and they are great ( I use them with the Denk 21's). The images merge perfectly and easily. What really impresses me how comfortable it is to view through them. I just see more than I do through a single eyepiece of the same power. I just got in form viewing Jupiter and is was awesome, even with marginal conditions. You are going to love them!


Post Extras: Print Post   Remind Me!   Notify Moderator  
ohioalfa64
sage


Reged: 08/16/12

Loc: Ohio (NW)
Re: Binotron-27 - That was it for me new [Re: Mauikj]
      #5709178 - 03/02/13 05:26 PM

I ordered the Binotron-27 for my Dob and 150mm Mak f/12. Which diagonal do I need to use for these Binos? Can I remove the power-bar from the Bino and still focus if I use a Baader Prism diagonal? Sorry if this off topic.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Never2Busy4You
super member
*****

Reged: 11/20/11

Loc: Slower Lower Delaware U.S.A.
Re: Binotron-27 - That was it for me new [Re: ohioalfa64]
      #5711473 - 03/03/13 09:00 PM

Any 2" diagonal should work with the Binotrons, and 1.25" diagonals should work if you get a 1.25" nosepiece. They should come to focus with your Baader prism diagonal with or without the Power x Switch, but without it you lose the ability to get Barlow & Reducer modes out of the same pair of EP's, so I would leave it on. YMMV.
Enjoy them either way.
I am very pleased with them so far, and the ability to collimate them for a perfect merge myself is just fantastic.


Post Extras: Print Post   Remind Me!   Notify Moderator  
faackanders2
Carpal Tunnel


Reged: 03/28/11

Re: Binotron-27 - That was it for me new [Re: Never2Busy4You]
      #5713260 - 03/04/13 08:11 PM

Quote:

Any 2" diagonal should work with the Binotrons, and 1.25" diagonals should work if you get a 1.25" nosepiece. They should come to focus with your Baader prism diagonal with or without the Power x Switch, but without it you lose the ability to get Barlow & Reducer modes out of the same pair of EP's, so I would leave it on. YMMV.
Enjoy them either way.
I am very pleased with them so far, and the ability to collimate them for a perfect merge myself is just fantastic.




I don't have an SCT, but I have seen others write that for SCTs 1.25" diagonals are preferred due to their shorter length than 2" minimizing the loss of effective aperture.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Never2Busy4You
super member
*****

Reged: 11/20/11

Loc: Slower Lower Delaware U.S.A.
Re: Binotron-27 - That was it for me new [Re: faackanders2]
      #5713602 - 03/04/13 11:30 PM

The shorter length of the 1.25" vs the 2" diagonal helps if the scope has a limited amount of back focus, most standard design SCT's don't have a problem with back focus since the mirror moves back and forth when focusing. The poster mentioned using a 150mm MAK, however some refractor users may find a great benefit for the shorter light path through a 1.25 diagonal. I am not familiar with aperture loss due to using a 2" diagonal, can you explain this for me, or have a referance link? I'm always interested to learn new things.
Thanks,
Jeffrey G.


Post Extras: Print Post   Remind Me!   Notify Moderator  
GlennLeDrew
Postmaster
*****

Reged: 06/18/08

Loc: Ottawa, Ontario, Canada
Re: Binotron-27 - That was it for me new [Re: Never2Busy4You]
      #5713872 - 03/05/13 05:22 AM

Jeffrey,
The aperture loss referred to applies only to telescopes having moveable primary mirrors for focusing (or, in general, systems which have variable separation between mirrors, both of which have optical power [not flat]). when the focus must be set so as to place the focal surface beyond some particular distance beyond the rear of the scope (as when one or more sizeable accessories 'eats up' lots of optical path length), the light cone for on-axis imagery will be clipped by the innermost opening if the primary baffle.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Never2Busy4You
super member
*****

Reged: 11/20/11

Loc: Slower Lower Delaware U.S.A.
Re: Binotron-27 - That was it for me new [Re: GlennLeDrew]
      #5721530 - 03/09/13 02:31 AM

Glen,
Thanks, I understand. I would think that in most cases it would be more accessories than just a 2" diagonal, or very dependent upon the design of the system.
Is there a definitive way to verify if there is an amount of aperture loss?
As an example,
I have been using a Denkmeier R2 Diagonal (it's a 2" diagonal that has a power switch on each side of the mirror housing) with the Denk II & Binotron-27 Binoviewers on a CPC800. I just purchased the CPC1100 & am looking forward to trying the combination on it as well. Visually I have not noticed any difference between using the R2 Diagonal, or a WO 2" Diagonal with the Binoviewers so this never crossed my mind.
Is there a way to measure if the aperture is being reduced by the longer light path of the R2, over the standard 2" version, or a difference between either of them over a 1.25" diagonal?
Thanks,
Jeffrey G.


Post Extras: Print Post   Remind Me!   Notify Moderator  
faackanders2
Carpal Tunnel


Reged: 03/28/11

Re: Binotron-27 - That was it for me new [Re: Never2Busy4You]
      #5722371 - 03/09/13 01:44 PM

Quote:

Glen,
Thanks, I understand. I would think that in most cases it would be more accessories than just a 2" diagonal, or very dependent upon the design of the system.
Is there a definitive way to verify if there is an amount of aperture loss?
As an example,
I have been using a Denkmeier R2 Diagonal (it's a 2" diagonal that has a power switch on each side of the mirror housing) with the Denk II & Binotron-27 Binoviewers on a CPC800. I just purchased the CPC1100 & am looking forward to trying the combination on it as well. Visually I have not noticed any difference between using the R2 Diagonal, or a WO 2" Diagonal with the Binoviewers so this never crossed my mind.
Is there a way to measure if the aperture is being reduced by the longer light path of the R2, over the standard 2" version, or a difference between either of them over a 1.25" diagonal?
Thanks,
Jeffrey G.




I supposed you could draw out the light cone path, but with an SCT you would need to know where the focused mirror position would be (so it is not as easy as a Dob which just has the eyepiece move for focus.


Post Extras: Print Post   Remind Me!   Notify Moderator  
ohioalfa64
sage


Reged: 08/16/12

Loc: Ohio (NW)
Re: Binotron-27 - That was it for me new [Re: faackanders2]
      #5722920 - 03/09/13 08:08 PM

While waiting for my Bonotron 27, I have been shopping for eyepieces for its use. Is this an amateur's approach? Should I just buy the extremely expensive Denk 21s? I have so far Nagler 11mm T5s, Vixen LNV Langanum 17s and one of two require 24mm Panoptics. I figure I can always sell what I don't use. Similarly I am looking at WO 7.25-22mm zooms. Am I all wet? Would Denk 14s or Denk 21s really be BETTER for the new Binoviewer?

Edited by panhard (03/15/13 10:54 AM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
Mauikj
member


Reged: 06/08/08

Loc: Maui, Hawaii, USA
Re: Binotron-27 - That was it for me new [Re: ohioalfa64]
      #5722935 - 03/09/13 08:19 PM

Hey ohioalfa,
I can't say if other eyepieces are better or a better value than the Denks, but I figured Russ would optimize them for the Binoviewers so when I ordered my Binotron I got a set of the 21's too. With the powerswitch I get a great range of magnification and the quality is first rate. Again, I can't compare them but I can say I'm really happy with them (plus they are not too heavy so they don't add a lot to the Binoviewer's weight).

Good Luck - you will love your binotrons!


Post Extras: Print Post   Remind Me!   Notify Moderator  
rockethead26
Carpal Tunnel
*****

Reged: 10/21/09

Loc: Arizona, USA
Re: Binotron-27 - That was it for me new [Re: Mauikj]
      #5722985 - 03/09/13 08:58 PM

If someone wouldn't mind measuring, what is the housing diameter on the Denk 21s?

Post Extras: Print Post   Remind Me!   Notify Moderator  
Mauikj
member


Reged: 06/08/08

Loc: Maui, Hawaii, USA
Re: Binotron-27 - That was it for me new [Re: rockethead26]
      #5723045 - 03/09/13 09:49 PM

I get 1 3/4 inches. A tiny bit more if you count the rubber grips on the barrels.

Post Extras: Print Post   Remind Me!   Notify Moderator  
johnnyha
Postmaster
*****

Reged: 11/12/06

Loc: Sherman Oaks, CA
Re: Binotron-27 - That was it for me new [Re: Mauikj]
      #5723059 - 03/09/13 10:03 PM

alfy - congrats I am also waiting on the B27s.

I would recommend getting a second Pan 24 since you already have one. I would recommend them anyway over the Denk 21s. The Pan 24 will give you the largest FOV possible with the B27s and they are considered to be THE widefield eyepiece of choice for binoviewing.

With the 3X Powerswitch, the 11T6 makes a perfect jump from the highest setting with the Pan 24s, so it's not a bad choice either and in fact I loved mine when I had them and the only reason I now have the 13T6s is they are slightly physically smaller. But if you go by mag jumps with the Powerswitch, the 11T6 is the logical choice to go with the Pan 24s.


Post Extras: Print Post   Remind Me!   Notify Moderator  
rockethead26
Carpal Tunnel
*****

Reged: 10/21/09

Loc: Arizona, USA
Re: Binotron-27 - That was it for me new [Re: Mauikj]
      #5723071 - 03/09/13 10:10 PM

Quote:

I get 1 3/4 inches. A tiny bit more if you count the rubber grips on the barrels.




Thanks! I'm trying to see if they will work for me.


Post Extras: Print Post   Remind Me!   Notify Moderator  
beatlejuice
Pooh-Bah
*****

Reged: 04/05/11

Loc: Hamilton, ON,Canada
Re: Binotron-27 - That was it for me new [Re: ohioalfa64]
      #5723263 - 03/10/13 12:31 AM

I got a pair of 25mm Sterlings about a year ago in anticipation of a future bino purchase. I really like them mono and figure to start with them and see about additions after I get my Binotron-27's, hopefully soon(7 weeks now)

Eric


Post Extras: Print Post   Remind Me!   Notify Moderator  
faackanders2
Carpal Tunnel


Reged: 03/28/11

Re: Binotron-27 - That was it for me new [Re: johnnyha]
      #5724381 - 03/10/13 05:45 PM

Quote:

alfy - congrats I am also waiting on the B27s.

I would recommend getting a second Pan 24 since you already have one. I would recommend them anyway over the Denk 21s. The Pan 24 will give you the largest FOV possible with the B27s and they are considered to be THE widefield eyepiece of choice for binoviewing.

With the 3X Powerswitch, the 11T6 makes a perfect jump from the highest setting with the Pan 24s, so it's not a bad choice either and in fact I loved mine when I had them and the only reason I now have the 13T6s is they are slightly physically smaller. But if you go by mag jumps with the Powerswitch, the 11T6 is the logical choice to go with the Pan 24s.




+1 Most like the wider view 24mm Panoptics the best with binoviewers. I have 14mm 82 AFOV ES but use the 24 Pans much more. Power switches help get highr powers with my Dob.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Mike Harvey
Pooh-Bah


Reged: 03/01/04

Loc: Orlando, FL.
Re: Binotron-27 - That was it for me new [Re: ohioalfa64]
      #5724892 - 03/10/13 10:57 PM

Quote:

While waiting for my Bonotron 27, I have been shopping for eyepieces for its use. Is this an amateur's approach? Should I just buy the extremely expensive Denk 21s? I have so far Nagler 11mm T5s, Vixen LNV Langanum 17s and one of two require 24mm Panoptics. I figure I can always sell what I don't use. Similarly I am looking at WO 7.25-22mm zooms. Am I all wet? Would Denk 14s or Denk 21s really be BETTER for the new Binoviewer?




If you bothered to do your own homework, you'd find that the Power-x-Switch eliminates the need for as many eyepiece pairs as other binoviewers.
I prefer the 21 Denks and, except for very high power use, they stay in the unit perhaps 75% of the time. For those "higher powers", I prefer Naglers simply for the larger field of view.



Edited by Geo557 (03/15/13 09:55 PM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
Never2Busy4You
super member
*****

Reged: 11/20/11

Loc: Slower Lower Delaware U.S.A.
Re: Binotron-27 - That was it for me new [Re: Mike Harvey]
      #5725056 - 03/11/13 01:03 AM

+1

Post Extras: Print Post   Remind Me!   Notify Moderator  
Geo557Moderator
Astro-Scout
*****

Reged: 10/10/07

Loc: SE GA
Re: Binotron-27 - That was it for me new [Re: Never2Busy4You]
      #5733355 - 03/15/13 01:04 AM

Moderators note:

"Posts that are not respectful of other individuals (be they members or not) are not welcome here."

The above short statement is quoted from our Terms of Service. It is one of many guidelines set forth that should be followed by all who post here. It is suggested that those who may have forgotten these rules or who have yet to read them, do so.

Again, play by the rules gentlemen. No disrespectful posts.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Fogboundturtle
professor emeritus


Reged: 05/20/09

Loc: Burnaby, BC
Re: Binotron-27 - That was it for me new [Re: Geo557]
      #5733768 - 03/15/13 10:06 AM

Geez. This is only a binoviewer. No need to get all emotional and such. I took the denk 21 eyepieces because it calibrated to be used with the binoviewer.

I am not working for or paid for by DenkMeier.


Post Extras: Print Post   Remind Me!   Notify Moderator  
teskridg
Pooh-Bah


Reged: 01/15/08

Loc: PA
Re: Binotron-27 - That was it for me new [Re: Fogboundturtle]
      #5741194 - 03/18/13 05:19 PM

I use the Earthwins with power x switch and an 11" SCT. I can't say I notice reduced aperture/resolution with the lowest power position, but 24mm Panoptics and 32mm Plossls do vignette somewhat in the reduced, lowest power x switch position. This is not the case with 30mm Plossls and I would expect there would be no vignetting with the 21mm Denkmeier eyepieces also. This vignetting isn't too disagreeable but it is present. Tim

Post Extras: Print Post   Remind Me!   Notify Moderator  
GlennLeDrew
Postmaster
*****

Reged: 06/18/08

Loc: Ottawa, Ontario, Canada
Re: Binotron-27 - That was it for me new [Re: teskridg]
      #5741676 - 03/18/13 08:33 PM

If one has any doubts about aperture loss, there are two ways to check.

1) The flashlight test. With eyepiece installed and focused at least near to infinity, shine a bright, compact light source straight into the eyepiece from a distance of a foot or two. Measure the diameter of the circle of light emerging out the front end.

An alternative: install a short focal length eyepiece so as to get an exit pupil Of about 1-2mm. Shine a green laser straight into the exit pupil, with the laser housing in contact if you wish. You will likely have a brighter circle of light to measure the diameter of. If the aperture is not fairly come telly illuminated at once, your laser beam is of narrower diameter than the exit pupil; increase the magnification.

2) With eyepiece installed and focused at least near to infinity, look into the front of the scope. Note the small image produced by the eyepiece. Move your eye laterally until the *center* of that image just becomes clipped, either by a baffle or the primary's edge. If a baffle edge clips the image center before it has reached the edge of the primary, aperture loss is occurring.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1 | 2 | (show all)


Extra information
3 registered and 2 anonymous users are browsing this forum.

Moderator:  TG, Geo557 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled


Thread views: 3149

Jump to

CN Forums Home


Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics