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Siebert Elite 45's versus Baader Mark V's w/ 24mm

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#26 Fred1

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Posted 23 November 2012 - 06:47 PM

I wonder if 20mm 100 AFOV explore scientifics would work in 2" binoviewers? Just curious since I don't have them, but the eyepieces are at their lowest $299 sale yet.

Since they have less than a 35mm field stop they should work fine with no vignetting but be sure that your interpupilary distance can accommodate them. The wider your head, the more comfortable the view. :crazy:

#27 Bob S.

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Posted 23 November 2012 - 10:39 PM

Astro Buds, The 20mm Nagler T5's were the absolute charm in the Siebert 2" BV's. The Moon, Jupiter, Double Cluster and Pleides all showed beautiful images. I am primarily a Newtonian guy but the wide fields in my 6.3" refractor were absolutely beautiful and different than what I usually get in my narrower FOV Newts. The 2" 20mm Naglers and Siebert Elites were made for each other. BTW, I did notice a slight bit more chromatic abberations on the limb of the Moon with the 20mm Naglers vs. 24mm Pans and I attribute this to the design of the eyepieces. It was barely noticeable but there. On the Terminator there was no hint of CA. I can't wait for the Moon to finally set and to see what the 20mm Naglers show binocularly in dark skies. I suspect after getting a hint with a more than half full Moon that the views are going to be jaw dropping. Bob

#28 DRodrigues

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Posted 24 November 2012 - 09:41 AM

Bob,
Now it would be also interesting to compare the Nagler's 20mm T5's on the Mark V - you just need 2 adapters 2" to T and 2 to 1.25"... The AFOV probably would decrease a bit since the 20mm T5 fieldstop is a bit more than the 27mm of the 1.25" format. Unfortunately these eps have too lower eye-relief to eye-glass users like me... :(

#29 Bob S.

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Posted 24 November 2012 - 10:25 AM

Bob,
Now it would be also interesting to compare the Nagler's 20mm T5's on the Mark V - you just need 2 adapters 2" to T and 2 to 1.25"... The AFOV probably would decrease a bit since the 20mm T5 fieldstop is a bit more than the 27mm of the 1.25" format. Unfortunately these eps have too lower eye-relief to eye-glass users like me... :(


David, I am about tapped out when it comes to buying more eyepieces or parts for these binoviewers. I needed to do all of this exhaustive testing to figure out what was what. I hadn't experienced such a frenzy of testing as has occured in the past couple of months in a while. It is now time for me to settle back on this front and just enjoy the views. I will now leave it to stronger hands to continue the quest for knowledge :question: :lol: Bob

#30 faackanders2

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Posted 24 November 2012 - 04:56 PM

Hooray, I got my 2" TV 20mm Nagler Type 5's in today and Harry Siebert was right on the money. No problems with IPD issues and they are so narrow that you can fully close the split between the BV pairs that makes it 55mm. I tried them just looking through the glass in the BV's and I only have about 1.5mm of extra IPD that I can play with. I now have every ep I will ever need for any project I can think of... and then some :o


Congrats and enjoy them!

#31 RAKing

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Posted 24 November 2012 - 05:41 PM

Bob,
Now it would be also interesting to compare the Nagler's 20mm T5's on the Mark V - you just need 2 adapters 2" to T and 2 to 1.25"... The AFOV probably would decrease a bit since the 20mm T5 fieldstop is a bit more than the 27mm of the 1.25" format. Unfortunately these eps have too lower eye-relief to eye-glass users like me... :(


David, I am about tapped out when it comes to buying more eyepieces or parts for these binoviewers. I needed to do all of this exhaustive testing to figure out what was what. I hadn't experienced such a frenzy of testing as has occured in the past couple of months in a while. It is now time for me to settle back on this front and just enjoy the views. I will now leave it to stronger hands to continue the quest for knowledge :question: :lol: Bob


I worked things out with my calculator and the FOV with the 20T5 is almost identical to the FOV with my 24 Pans. Yes the magnification is up a bit and the exit pupil is smaller, so you might see blacker sky.

Bottom line: I'm not sure I would bother trying to narrow them down and shoehorn them into my Mark V if the view is that close to the Panoptics. :scratchhead:

Now having said that - if the view Bob is getting with his 20T5 is even close to the view I get with my 24 Pans, I can easily see why he is so happy. There have been nights where that was the only pair of eyepieces I used for hours. They are that good!

Cheers,

Ron

#32 Bob S.

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Posted 24 November 2012 - 06:11 PM

Bob,
Now it would be also interesting to compare the Nagler's 20mm T5's on the Mark V - you just need 2 adapters 2" to T and 2 to 1.25"... The AFOV probably would decrease a bit since the 20mm T5 fieldstop is a bit more than the 27mm of the 1.25" format. Unfortunately these eps have too lower eye-relief to eye-glass users like me... :(


David, I am about tapped out when it comes to buying more eyepieces or parts for these binoviewers. I needed to do all of this exhaustive testing to figure out what was what. I hadn't experienced such a frenzy of testing as has occured in the past couple of months in a while. It is now time for me to settle back on this front and just enjoy the views. I will now leave it to stronger hands to continue the quest for knowledge :question: :lol: Bob


I worked things out with my calculator and the FOV with the 20T5 is almost identical to the FOV with my 24 Pans. Yes the magnification is up a bit and the exit pupil is smaller, so you might see blacker sky.

Bottom line: I'm not sure I would bother trying to narrow them down and shoehorn them into my Mark V if the view is that close to the Panoptics. :scratchhead:

Now having said that - if the view Bob is getting with his 20T5 is even close to the view I get with my 24 Pans, I can easily see why he is so happy. There have been nights where that was the only pair of eyepieces I used for hours. They are that good!

Cheers,

Ron


Ron, Thanks for working out the math. I am not inclined to figure out FOV's and such. I think between my 36mm Siebert's, 24mm Pans, 20mm Naglers, and 18mm BGAO's I may have all the ep's I need for my binoviewers? I do have matched sets of Brandons from 32mm down to 12mm but I am thinking that they may be unnecessary since my primary scope will be a 20" f/3 Newtonian? The Brandons are perfect for the refractor but are not really meant for fast scopes. Bob

#33 faackanders2

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Posted 24 November 2012 - 07:15 PM

20" f3.0 with 2" binoviewers. Views must be awsome!

#34 Bob S.

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Posted 24 November 2012 - 07:30 PM

20" f3.0 with 2" binoviewers. Views must be awsome!


Don't know yet. The 20" will be completed in three weeks. Should be awesome. What is really weird is that this 20" was designed to do astrovideo at least 50% of the time. However, I have absolutely gotten reignighted with visual astronomy. I guess I am getting back into my 120+ viewing sessions/year for the next couple of years. With my solar observing adding to this number, this whole process could get absolutely stupid :foreheadslap: So much to see, so little time. My only sage advice is, don't get old, it really cramps your observing trajectory :lol:

#35 faackanders2

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Posted 24 November 2012 - 08:55 PM

20" f3.0 with 2" binoviewers. Views must be awsome!


Don't know yet. The 20" will be completed in three weeks. Should be awesome. What is really weird is that this 20" was designed to do astrovideo at least 50% of the time. However, I have absolutely gotten reignighted with visual astronomy. I guess I am getting back into my 120+ viewing sessions/year for the next couple of years. With my solar observing adding to this number, this whole process could get absolutely stupid :foreheadslap: So much to see, so little time. My only sage advice is, don't get old, it really cramps your observing trajectory :lol:


Is it a Webster scope? I like the low eyepiece height.

P.S. Hope your solar observing is a smaller scope, so you don't set your town on fire. :lol: :roflmao:

#36 Bob S.

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Posted 24 November 2012 - 11:44 PM

20" f3.0 with 2" binoviewers. Views must be awsome!


Don't know yet. The 20" will be completed in three weeks. Should be awesome. What is really weird is that this 20" was designed to do astrovideo at least 50% of the time. However, I have absolutely gotten reignighted with visual astronomy. I guess I am getting back into my 120+ viewing sessions/year for the next couple of years. With my solar observing adding to this number, this whole process could get absolutely stupid :foreheadslap: So much to see, so little time. My only sage advice is, don't get old, it really cramps your observing trajectory :lol:


Is it a Webster scope? I like the low eyepiece height.

P.S. Hope your solar observing is a smaller scope, so you don't set your town on fire. :lol: :roflmao:


No, It is a Lockwood-mirrored JP Astrocraft. It is about 90% complete in this picture.

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#37 RAKing

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Posted 25 November 2012 - 08:00 AM

Ron, Thanks for working out the math. I am not inclined to figure out FOV's and such. I think between my 36mm Siebert's, 24mm Pans, 20mm Naglers, and 18mm BGAO's I may have all the ep's I need for my binoviewers? I do have matched sets of Brandons from 32mm down to 12mm but I am thinking that they may be unnecessary since my primary scope will be a 20" f/3 Newtonian? The Brandons are perfect for the refractor but are not really meant for fast scopes. Bob


Bob, It sounds like you have the field covered pretty well.

If I owned a pair of Sieberts, the only other eyepieces I would like to try would be a pair of 27 Panoptics. They are very compact for 2 inch eyepieces and would give me the wide field I want for my variable star estimates (47x, 1.44* FOV w/the 1.3 OCA in my TEC 140).

Now I just have to decide if the one-year wait and the hefty price tag are worth adding one more pair of eyepieces to my mix. :question:

BTW - I have always admired John's "Sweet Sixteens". He does great work and I'm sure you will love your 20 incher. :)

Cheers,

Ron

#38 Scott99

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Posted 26 November 2012 - 01:37 PM

Astro Buds, The 20mm Nagler T5's were the absolute charm in the Siebert 2" BV's.


Wow, that is an incredible setup with either apo or big Newt! I would definitely get in line to take a look. enjoy.

#39 Bob S.

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Posted 08 December 2012 - 06:19 AM

Astro Buds, The 20mm Nagler T5's were the absolute charm in the Siebert 2" BV's.


Wow, that is an incredible setup with either apo or big Newt! I would definitely get in line to take a look. enjoy.


Scott, These big binoviewers with the 20mm T5 Naglers absolutely blow me away. Last night I was looking at Jupiter and the Double Cluster in Perseus. I just wanted to spend hours looking at the Double Cluster. Siebert has said that the 45's would bring back the 3D effect that I had initially gotten when using binoviewers over a decade ago and he was so right. I was using a 12.5" f/5 Zambuto/Starstructure which in itself is a wonderful performer but with the Siebert 45's loaded with those 20mm Naglers, the views were simply show stopping. I think the FOV is supposedly the same for 24mm Pans but the magnification and just "spacewalk" feeling in stereo was mesmerizing. I can't wait until I get to try these binoviewers in my new 20" f/3 Lockwood/JP Astrocraft that will be completed next week. I have provisions for different UTA height changes that will allow for the most intense magnifications with the BV's. Should be a LOT of FUN! Bob






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