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Equipment Discussions >> ATM, Optics and DIY Forum

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careysub
Carpal Tunnel
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Reged: 02/18/11

Loc: Rancho Cucamonga, CA
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: gatorengineer]
      #6045042 - 08/25/13 11:44 AM

There are different theories of what a "travel scope" is.

All imply a scope that is light and compact relative to its aperture, but can have some very different criteria.

One is to have a scope that packs into itself to make a travel case. If you are going on an airline this would have to be carry on luggage and would have to fall under the weight and dimension restrictions of most airlines. An excellent example of this is the 10" Strock scope. This design is so good that if one wants this type of scope one would need to cast about for a really good reason not to use it.

(After posting I came up with a reason: according to Pierre the travel configuration is 36 cm wide. Checking the carry on baggage restrictions of American and Delta I find that their width restriction is 33 and 35 cm respectively, so they wouldn't let you carry it on assuming they impose this restriction accurately. Being forced to check this in the luggage hold would be a disaster, though cabin-checking might be possible.)

Another is simply to minimize over-all scope weight, and have it break down into small enough components to pack easily. This allows you put it in sufficiently tough luggage for checked baggage (though you have the option of carrying on some components). Gary Seronik's 15 lb 8" Aussie scope in the March S&T of this year is an example.

A distinct design objective is simplicity in some sense. No one wants a scope that is complex to set up, but a component minimizing, or a pop-up design (cf the ZipDob) is a different criterion that may drive up weight, volume, or complexity of design and build.

If you aren't taking it on airlines then criteria are relaxed, but then, why would not any of a number of commercial small-medium scopes work as well?

BTW, for the mirror for an 8" travel a good source would be to cannibalize the Orion 203mm f/4.9 Reflector Tube which lists for $300. It is a good focal length, not too short, not too long, and not too expensive (plus you get a 2" Crayford, the secondary, and a finder shoe). The mirror cell is heavy so you would want to remount it.

Edited by careysub (08/25/13 01:45 PM)


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cpr1
professor emeritus
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Reged: 03/24/12

Loc: Louisiana
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: careysub]
      #6045127 - 08/25/13 12:48 PM

Some very interesting ideas here! Great info.

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careysub
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Reged: 02/18/11

Loc: Rancho Cucamonga, CA
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Chriske]
      #6045280 - 08/25/13 02:16 PM

Quote:

Quote:

For the connectors it would be easy to turn some round bar stock to just under, and then tap the center. DJ light connectors...




Never seen it ( I think), explain please..




He probably means these:
http://www.fullcompass.com/product/408818.html?utm_source=googleps&utm_me...

DJ makes other lighting strut clamps also, but this one looks like the most suitable for this purpose.


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gatorengineer
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Reged: 02/28/05

Loc: Hellertown, PA
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Pinbout]
      #6045282 - 08/25/13 02:17 PM

May have found collapsable truss poles. Repurposed trekking poles. Sierra trading has some on clearance for $20 a pair... Yeah I know its $80 for 8 but. if they work it still wouldnt be bad.

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Pinbout
Postmaster
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Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: gatorengineer]
      #6045308 - 08/25/13 02:31 PM

thats not bad, I saw some at campmore, since its "up the street" I always check out their camping equimp, and theirs is more than that.

all I always fight with using 8 angle alum vs round tube since the angles would pack a lot tighter than the round tubes since they stack on themselves.
but its so ugly...

even with a wood case design I still think it should ride in a padded softshell.

they remind me of wooden field cameras and I never just threw my 4x5 Zone vI walnut field camera in the backseat without having it in a padded bag.

and having it in a padded case you can drop the top which takes up space and just use a regular ground board. a lot tighter case.

so that brings me to make an ultra light instead of a suitcase box.


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Pinbout
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Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: gatorengineer]
      #6045884 - 08/25/13 08:20 PM

I still think a split truss makes a great travel package. remove two sets of trusses and the bottom cell and top uta ring pack up the center pivot box.

http://sketchup.google.com/3dwarehouse/details?mid=167488e723ef733e793d59b883...

it's just how do you mount it, get an astrogoods foldable base?

for traveling the "box" would be pretty small.


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kfrederick
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Reged: 02/01/08

Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Pinbout]
      #6161970 - 10/28/13 07:49 AM Attachment (9 downloads)

Mark What you drawing up for the water jet cut travel telescope ? Now you see how nice it cuts wood . Any ideas Mark is drawing it up now .

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