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Cyclop_si
professor emeritus
*****

Reged: 03/13/08

Loc: Slovenia
Re: Explore Scientific 3" 30mm Prototype new [Re: pbsastro]
      #5568667 - 12/13/12 04:35 AM

True 3" diagonal is only valid option here.
Why spend almost 2k$ for 2" opening on steroids. And majority of "stock" 2" focusers are not able to support that weight, while FT and similar 3+ inch focusers are capable of this task.



Quote:

... think about a 40mm-75deg....




You already have (almost) that eyepieces: Pan41, SWA40, XW40...


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APM M.Ludes
Vendor (APM Telescopes)
*****

Reged: 05/01/03

Loc: Germany
Re: Explore Scientific 3" 30mm Prototype new [Re: rboe]
      #5568709 - 12/13/12 06:12 AM

I forced Scotti to do it, I want one :-)

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APM M.Ludes
Vendor (APM Telescopes)
*****

Reged: 05/01/03

Loc: Germany
Re: Explore Scientific 3" 30mm Prototype new [Re: pbsastro]
      #5568710 - 12/13/12 06:13 AM

making a high quality 3" diagonal is no problem, at least not for APM, 3 to 4 weeks delivery time

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APM M.Ludes
Vendor (APM Telescopes)
*****

Reged: 05/01/03

Loc: Germany
Re: Explore Scientific 3" 30mm Prototype new [Re: JayinUT]
      #5568711 - 12/13/12 06:15 AM

I asked scotty to make the eyelens bigger so I can look in with 2 eyes :-)

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faackanders2
Carpal Tunnel


Reged: 03/28/11

Re: Explore Scientific 3" 30mm Prototype new [Re: frebie]
      #5568896 - 12/13/12 09:56 AM

Make the widest TFOV 3" eyepiece possible for 100 AFOV and 82 AFOV and 70 AFOV, to take full advantage of 3". I don't feel I would ever be able to afford a 120 AFOV max TFOV.

P.S. These may be the eyepieces people will build telescope around (3" refractors, 3" reflectors, and 3" SCTs).


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Gord
Carpal Tunnel
*****

Reged: 01/06/04

Loc: Toronto, ON, Canada
Re: Explore Scientific 3" 30mm Prototype new [Re: JayinUT]
      #5568959 - 12/13/12 10:30 AM

The diagonal already has a 3" output and appears as though the mirror would fully support that size. If this is done right, the input size could be swapable (just thread on a new nosepiece) and work with various different scopes focuser sizes.

For example, 2" is the common standard, but there are ones at 2.4" (TV), 2.5" (APM?), 2.7" (A-P & Tak), 3" (FT), 3.25" (Celestron's SCT's), 3.5" (FT), 4" (A-P), etc. You could just have one diagonal design and various different nose pieces. Then people could pick which ones work for their setup (or multiple setups). Some would not offer all the benefits (ex. 2" etc), but it's at least giving options and these would really not be a huge cost to manufacture.

As I said in the thread on the EP forum, I hope we might see some other options in the large format. I'm guessing that some simpler designs (relatively speaking) more along the lines of super or ultra-wides (68-82 deg) would be cheaper than the 100deg so a wider field option in the 50-60mm FL would be possible. The $1200 price option is higher (but not unreasonable for what this is), but something with lower specs (ex. a 55mm 68deg) in the $500 range would be quite paletable and useful to the big cat/refractor owners. Not that much more than the big 2" Plossl's, or the 41mm Panoptic for example.

Clear skies,


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dcoyle
professor emeritus


Reged: 10/11/05

Loc: Turbulent but dark skies, N.M.
Re: Explore Scientific 3" 30mm Prototype new [Re: faackanders2]
      #5568985 - 12/13/12 10:44 AM

I would be concerned about the twisting torque that weight could pose.

It seems to me that if a new standard is established for 3" focusers, it ought to have something like a compression ring lock or splines, not a few #6 screws, to keep that 8 pound baby from rotating. Splines could be at every 20 degrees, so one could set the diagonal at various orientations to facilatate veiwing in different positions.

Dan


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frebieAdministrator
Chief assistant to the assistant chief


Reged: 04/29/08

Loc: Neither here nor there.
Re: Explore Scientific 3" 30mm Prototype new [Re: dcoyle]
      #5569045 - 12/13/12 11:16 AM

Concerning the weight and safety, Scott thought a lanyard on the eyepiece with a D-ring carabiner on the end for connecting to the scope might be useful to keep the eyepiece from hitting the ground in case of an accident. What say you? It works with DSLR bodies when imaging.

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Jobryant
sage


Reged: 01/13/09

Re: Explore Scientific 3" 30mm Prototype new [Re: frebie]
      #5569659 - 12/13/12 05:52 PM

More info here http://www.youtube.com/watch?v=nnjlmxHQfmw

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pbsastro
professor emeritus
*****

Reged: 03/21/07

Re: Explore Scientific 3" 30mm Prototype new [Re: frebie]
      #5569728 - 12/13/12 06:32 PM

Quote:

Concerning the weight and safety, Scott thought a lanyard on the eyepiece with a D-ring carabiner on the end for connecting to the scope might be useful to keep the eyepiece from hitting the ground in case of an accident. What say you? It works with DSLR bodies when imaging.



What about a parachute on the eyepiece, plus an air-bag for the landing? I would drop it on purpose often to enjoy the ride

Sorry couldn't resist


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pbsastro
professor emeritus
*****

Reged: 03/21/07

Re: Explore Scientific 3" 30mm Prototype new [Re: Jobryant]
      #5569747 - 12/13/12 06:46 PM

Quote:

More info here http://www.youtube.com/watch?v=nnjlmxHQfmw




What a beauty. Can't wait to get one.
The field lens is bigger than I expected, which is a good sign that we will get a totally unvignetted, 100% illuminated, field of view.
ES rules!


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pbsastro
professor emeritus
*****

Reged: 03/21/07

Re: Explore Scientific 3" 30mm Prototype new [Re: Cyclop_si]
      #5569766 - 12/13/12 07:13 PM

Quote:

Quote:

... think about a 40mm-75deg....




You already have (almost) that eyepieces: Pan41, SWA40, XW40...




You may be right. I already have the XW40, which I find perfect by the way. I just usually prefer the 100 deg views of the 17 Ethos.
The XW40 has about 46mm field stop, about same as Pan41. So 52mm of the 40-75 may not be a big enough step to justify it.
However I think a smaller AFV eyepiece allows to use more of the eyepiece barrel, so it should be possible to fit a larger 75 deg eyepiece in the 3" barrel than what is possible with 100 deg. Say 62mm. That would translate to a 54mm-70deg or a 50mm-75deg.
But 50mm may be too much focal length for me.
So I think my preferred companion to the 30-100 would be a 20mm-120deg (or 17-120), weighting about the same as the 30-100, so that the scope would keep balance when changing eyepiece. The perfect pair!


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pbsastro
professor emeritus
*****

Reged: 03/21/07

Re: Explore Scientific 3" 30mm Prototype new [Re: pbsastro]
      #5569780 - 12/13/12 07:20 PM

The 30-100 is getting famous. One of these days we may get to see it on TV.
Sorry couldn't resist again.


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Jim7728
Postmaster
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Reged: 04/10/05

Loc: Stoop Landing Observatory, NYC
Re: Explore Scientific 3" 30mm Prototype new [Re: pbsastro]
      #5570471 - 12/14/12 08:46 AM

From the video: 6.25 degrees TFOV with the ES 80ED!

I think I want one or at least check out in person at NEAF.


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EFT
Vendor - Deep Space Products
*****

Reged: 05/07/07

Loc: Phoenix, AZ
Re: Explore Scientific 3" 30mm Prototype new [Re: pbsastro]
      #5570523 - 12/14/12 09:33 AM

Quote:

Quote:

Concerning the weight and safety, Scott thought a lanyard on the eyepiece with a D-ring carabiner on the end for connecting to the scope might be useful to keep the eyepiece from hitting the ground in case of an accident. What say you? It works with DSLR bodies when imaging.



What about a parachute on the eyepiece, plus an air-bag for the landing? I would drop it on purpose often to enjoy the ride

Sorry couldn't resist




Something a kin to what the Spirit and Opportunity rovers used when they bounced onto Mars would probably do the trick.


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junomike
Carpal Tunnel
*****

Reged: 09/07/09

Loc: Ontario
Re: Explore Scientific 3" 30mm Prototype new [Re: EFT]
      #5570804 - 12/14/12 12:50 PM

One important thing! Filters? I guess we all have to replace our Filters with 3" versions? Can't put a 2" Filter on a 3" eyepiece!

Mike


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dscarpa
Post Laureate
*****

Reged: 03/15/08

Loc: San Diego Ca.
Re: Explore Scientific 3" 30mm Prototype new [Re: frebie]
      #5570914 - 12/14/12 02:10 PM

It would be wise to wear steel toed boots when using it. David

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coopman
Post Laureate
*****

Reged: 04/23/06

Loc: South Louisiana
Re: Explore Scientific 3" 30mm Prototype new [Re: dscarpa]
      #5571475 - 12/14/12 08:16 PM

Just what the Dr. ordered - an eyepiece that will turn any scope into a diving duck.

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APM M.Ludes
Vendor (APM Telescopes)
*****

Reged: 05/01/03

Loc: Germany
Re: Explore Scientific 3" 30mm Prototype new [Re: junomike]
      #5572031 - 12/15/12 05:19 AM

CHROMA Filters in USA makes UHC, O-III, Deep Sky and other filters in big sizes, they made my full 150 mm size for the big Fuji :-)

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mclewis1
Thread Killer
*****

Reged: 02/25/06

Loc: New Brunswick, Canada
Re: Explore Scientific 3" 30mm Prototype new [Re: APM M.Ludes]
      #5572349 - 12/15/12 10:56 AM

Suggestions/Options:

How about one of those Medic Alert things ... just in case the eyepiece/diagonal combo pulls a small refractor over on it's side? - "help I've fallen and can't get up".

An airbag in case it's dropped - you could probably incorporate one around the outside edge without it changing the size and shape at all.

An arrow indicating which end to look into - because it's not going to be obvious when this thing is used on a small refractor.

Handles to hang onto so you don't fall into that big black hole.

Long term financing, something on the order of a small bank bail out.

Name and number of a good divorce attorney - because you're gonna need one when the CFO finds out you spent over $1000 on "another eyepiece".


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