

1.8X Siebert OCA
#1
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Posted 29 April 2003 - 04:41 PM

#2
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Posted 29 April 2003 - 05:41 PM
And sorry Glen, but is that really a photo of the actual person that goes by the name Fence Ron Sitter on the other thread - boy this is going to be interesting, Jim? and others I would love to get a gander at you all.
Scott.
#3
Posted 29 April 2003 - 06:22 PM
Yup, that's me. Any complaints will have to be taken up with my folks. I had nothing to do with it.

Ron
#4
Posted 29 April 2003 - 06:24 PM
... and others I would love to get a gander at you all.
Scott.
http://hatchet.badax...stro/lurch.html
Tom T.
#5
Posted 29 April 2003 - 06:59 PM
Do you think standing next to a dob (two no less) will make you look skinnier?

By the way, have you made your special shroud for Lurch yet?
What this has to do with 1.8X Seibert OCA's I'm not sure. But I miss the kicking girl icon.
Ron
PS: Scott, I guess it's your turn...

#6
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Posted 29 April 2003 - 07:43 PM

#7
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Posted 29 April 2003 - 09:20 PM
Harry Siebert
#8
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Posted 29 April 2003 - 10:01 PM

#9
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Posted 30 April 2003 - 06:41 AM
Scott.
#10
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Posted 05 May 2003 - 09:40 PM
League in The Universe Sampler.We had a period where I would say it was a solid 9 for about 2hrs. on Sat. between 11:33pm and1:30am. The temp was 57degrees at 6:00pm and had dropped to below 30degrees by midnight.I had a partially full water bottle that was half frozen by 1:00am on Sat.My 15inch Discovery truss dob has a 2.5in thick mirror with two 30cfm
3in fans mounted just above the mirror and facing one another with a 1in. offset and about a 5to7degree tilt toward the mirror they are just out of the optical path.I started them at 6:00pm and by 10:00pm the mirror was cooled down and it appeared to follow the temperature drop very nicely through-out the observing session.Other scopes present were two MagOne 12.5in Portaballs and two LX90s A homemade 14in tube dob and an 8in Discovery DHQ.Every Messier Object I looked at was an easy target and never failed to impress the other observers at the site when they looked through my bino-OCA combo.Some of the reaction was definitely due to the "Binoviewer Effect" as these people had heard about them but had nerver looked through one before.The most common comment was how much more detail could be seen and the lack of fatigue while observing.DSO challenges were Abell 2151 and Abell 1656 and another cluster in chart 37.5 in the Night Sky Observers Guide Vol.2 in the Coma Berenices section.I didn,t get the name of that one.At 100x it was strange to look at with fuzzy spots all over the field of view,like ghosts of fire-flies in front of your eyes,it was acually hard to look at.Abell 2151 was much more rewarding with many galaxies easily seen.Abell 1656 wasn,t quite as impressive.The galaxies appear smaller and were not as interestingly shaped as Abell 2151.The high point for me was seeing the connecting bridge between the two galaxies in M51 on Sat. during that 2hr.window of excellent seeing.The Messier Objects were viewed at 100x to 180x with 225x used on M5.Hard focus on M5 was acheived at 180x the image started to waver a little bit at 225x.150x seemed to offer the best views of M objects that were galaxies.Globular clusters looked best at 180x.I screwed-up and forgot try 225x on M13,it looked great at 180x.I made the ultimate sacrifice and loaned my BWOptics-1.8OCA setup to Paul our Asst.Obs.Director for approximatley 1hr.14min.16secs and I had to twist his arm to get it out of the focuser on his MagOne.He may be a convert to binoviewing.

In summation I would say that the Siebert 1.8OCA is a finely finished instrument of excellent design that delivers exactly the performance promised.It corrects to a degree the short-comings of inexpensive plossls when used in faster scopes and has excellent light through-put in combination with the BW-Optics binoveiwer.I give it two thumbs up. Clear skies and no mosquitos,Scotty
#11
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Posted 06 May 2003 - 08:05 PM
I was Bino'd too of course (Denk and 2" OCS), although because I had, if not the first, then certainly the only bino present, I was consequently sharing those photons with not just a few other folks. Queues were the order of the evening and they didn't get any better when I took the bino out of my 10" and put it into Daves 16" dob. I eventually had to sneak around in the dark and say nothing to avoid them! :-)I might also add that no one (other than poor old Dave who has problems even with binoculars) even mentioned any difficulty merging the images. Those I did ask said ther was no problem at all)
I only have one set of EP's for the bino - 25mm plossls (as in cheap) however with the two power modes of the OCS provided for beautiful views (around 65x and 125x in my 10" and 100x and 200x in the 16") Dave was cyclops with a 16mm Nagler, and it was intriguing (although admittedly perhaps a little absurd) to compare the bino plossl vs the cyclops Nag' views. However, in short, both are a WOW view and my mind boggles at the thought of binoing with two naglers or their like! Anyhow a quick comparison at seeing mottling or arm definition in M83, as we might expect, it was probably fair to give it to the cyclops nagler but, gee, there wasn't much in it. The 'keyhole' (dark area in the bright nebula) in Carina on the other hand was more apparent in the bino - it was the old brains enhanced texture rendering process I think which just made it easier to see and define with the bino (given 'enough' brightness). Viewing Omega Centauri in the bino'd 16" brought enough Ooooh's and Ahhh's to double the length of the queue and the Nag' was never going to have that popularist effect.
The jewel box, a georgeous tight cluster with a dominant ruby star in Crux was definitely best in the bino, and if I may say, probably better even in my 10" bino'd than the 16" with Nagler (I might say the same about the Carina nebula in general really), there was such a sense of being right there, seeing it in the flesh somehow that made the bino view impossible to beat.
Anyhow thanks Glen, yes the plossls I see, are offered good correction from the OCA yet given the choice the attractions of a greater AFOV are impossible to deny.
Scott.
ps I've now got a set of 15mm plossls, woohoo - so bring on the moon, oh I see it's there and waiting... so bring on the clear skies!
#12
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Posted 07 May 2003 - 02:08 PM
James White
WPB
clueless in West Palm........hehe....
#13
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Posted 07 May 2003 - 02:56 PM
I just stick my Lumicon/BW-Optics into my diagonal on my Nexstar8 and observe no special preparation required.The Siebert 1.8 OCA is a superior design and would make a great barlow if you need one at 1.8x. If you unscrew the field element from your 140 barlow this would give about 3x when screwed directly into the bottom of your binoviewer which might be handy for use on the planets.I may be stating the obvious here, but be sure to collimate your scope straight through with no diagonal,as this gives the most accurate collimation possible.The more pieces that are screwed together to assemble your optical path the greater the chance for deflection and mis-collimation.
A focal reducer from Siebert or Denkmeier might be nice for a wider field of view on open clusters.I hope to have one of Sieberts Galaxy Viewer's soon.I will let you know how it works out. Scotty

#14
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Posted 07 May 2003 - 03:01 PM
So, u live in WPB, and I live in Loxahatchee, about 20 miles west from WPB.
I know that's not related to ur inquiry, but when I saw that u live in WPB, and wanted to drop u a line here, to introduced myself here, and updated u on what has happened with me and this newly founded hobby.
I used to be a member of PB Astronomical club back then, and it's just very difficult for me to communicate with the members in the dark, because I am deaf.
My wife is a hard of hearing herself and it's very hard for her to interpret in the dark....
I am considering to join back, but haven't decide.....because it's no fun doing it alone now....
So, anyway, I do believe u'll love the binoviewing,.and I am sure that Harry's products are very good!
I do have two sets of Harry's Ultra Plus 32" and 16"s Eps.
I like to use 16"s (65 deg AFOV) ep's for the moon and with the high powered OCS mode set up for the planetary views with my 11" Shorty.
(razor sharp than any other eps that I have here, and I was impressed)
I do have other sets of ep's beside Harry's, which are 24 pan, 19 pan, 7 nag T1.
I probably would need the set of 11 mm wide angle ep's to have the complete sets for binoviewing purpose, and I do not have that kind of money to spend right now.
The 32"s eps AFOV is too narrow (50 deg.) for me, and I am very particular with the AFOV. I have put it off putting this set and other ep's in the ads to sell.
Just that I tend got a cold feet, on each time.....oh well! Hate to be apart with them!
So, anyway, welcome to the club, and enjoy....
Talk later,
#15
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Posted 07 May 2003 - 03:19 PM
James
#16
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Posted 07 May 2003 - 03:37 PM
It's a stone throw away, if u're a HULK!

I am off from Hamlin Rd, about two miles west from Seminole Pratt Rd. (Hamilin Rd is two road south of Northlake Blvd and Seminole Pratt Rd.)
Yeah, I did stop doing this hobby for a while, till the binoviewer came.
It kinda of rekinkled and I still have to relearn alot here...
It'll come back to me....just that I need to be out more often, than I normally do.
In the first few years, I was commited, but later it got jaded, after stop coming to the club.
It just stopped for a few years, till now.
We can always get together and learning together.
I do have The Sky Commander on my 20" and make it easier on us to find the objects...
I am thrilled and I am looking forward to it...
Just that I need to get busy working on my 20" and get it up and running ASAP!
I do have the 11" Shorty, but no compare with the 20"!
Keep in touch....
#17
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Posted 07 May 2003 - 03:55 PM
Emailed u offline....