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Re: Polarcam Is Here!

PostPosted: Tue May 29, 2012 1:36 pm
by helgeras
Hi Tom,
would you mind going into a bit of detail on how you made the polar cam/collimator?
Which pieces you used (what cam etc.)?

I am not from the UK, so do not know all the technical expressions for plumbing etc :) What are "billeting parts adaptor" for instance?

Regards,
Helge

Re: Polarcam Is Here!

PostPosted: Tue May 29, 2012 5:26 pm
by teslar

Re: Polarcam Is Here!

PostPosted: Tue May 29, 2012 6:10 pm
by Barfbagger
The Billetparts adaptor is custom made for the Microsoft Lifecam Cinema HD while the plumbing part to fit the EQ6 polarscope is one of these. I don't know if you can find a similar item in Norway(?). Some people have had success with plastic 35mm film canisters.

Re: Polarcam Is Here!

PostPosted: Tue May 29, 2012 6:14 pm
by StevieDvd
A polarcam needs to have the built in lens left in place to be able to focus, the instructions for converting web cams for astro usage usually show the lens being removed as the telescope in effect is the new lens.

So a cheapy webcam for the polarcam as quality is not important.

Polarcam Is Here!

PostPosted: Tue May 29, 2012 7:15 pm
by teslar
Thanks guys you saved me from editing that post. I did it from work and was going to add the detail about lens being required :))
Also a warning that not all lifecam mods work out for collimation as I found out because the chip appears to be off centre on mine and the sharpcap reticule does not align properly

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Re: Polarcam Is Here!

PostPosted: Tue May 29, 2012 7:44 pm
by Dion
teslar wrote: not all lifecam mods work out for collimation as I found out because the chip appears to be off centre on mine and the sharpcap reticule does not align properly

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There is a workaround though ;) If you use the mire de collimation software and center it to the vignette you get from your focuser, well, it's not a vignette as such as it actually IS the inside perimeter of the focuser.

Re: Polarcam Is Here!

PostPosted: Tue May 29, 2012 7:51 pm
by helgeras
Thanks for the info. I checked the billetparts site and the adapter unfortunately is out of stock.

I mostly wanted a polarcam, any suggestions for a webcam that is easily modifiable with the "FloPlast Pushfit Socket Plug Black 32mm" linked above or something like it.

I will try to see if I can find such a plug here in Denmark, unfortunately I have no idea where to start looking :)

Helge

Re: Polarcam Is Here!

PostPosted: Tue May 29, 2012 8:23 pm
by Barfbagger
Helge, the main thing is the inside diameter of the socket plug. In the UK we used to have 1ΒΌ inch OD pipe and that was metricised to 32 mm, you probably have rounder numbers (30 or 35 mm?) in Denmark. For a polarscope webcam you basically need something that has reasonable low-light sensitivity so that it can pick up Polaris and then it must be modifiable to be held in the socket plug. Some webcams (like the Philips Toucams) have screw in lenses which you can thread through a hole in the socket plug to hold the webcam in place. Otherwise have a look round your house at various small polyethylene containers you might find something just the right size - if it's a really tight fit then drill a small air release hole. The advantage of the MS Lifecams is that although they don't have screw-in lenses they are cylindrical and that helps in mounting them. If you can't find something in a plumbing or DIY store (or film-processing lab) then I'm sure someone here would send you one at cost + postage. (I can do it but my timing may not be speedy as I travel a lot.)

Polarcam Is Here!

PostPosted: Tue May 29, 2012 9:42 pm
by teslar
Dion wrote:
There is a workaround though ;) If you use the mire de collimation software and center it to the vignette you get from your focuser, well, it's not a vignette as such as it actually IS the inside perimeter of the focuser.


Well I did try that and I had a perfect round circle perfectly central to the draw tube but for some reason the Cheshire shows the mirrors colimated but not aligned. I get the () effect of overlapping mirrors so I gave up on the lifecam and went by the Cheshire to get concentric circles which meant moving the secondary towards the front of the scope. Damn strange but the it seems to work. I'll find out for sure when I star test assuming its clear this weekend :praying:


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Re: Polarcam Is Here!

PostPosted: Sat Jul 28, 2012 10:50 am
by kirkster501
Hi Guys, Noob question please?
I am new to my EQ5 and I have made a Polarcam !! What a great idea !
One question though that I don't quite understand. Without Polar cam and I view trough the Polarscope, of course, the star circle pattern in the reticule moves with the reticle as RA is turned on the mount. But If I put Polarcam on, it does not turn because the polar cam moves with the Polarscope when RA is turned and so the reticule star pattern stays still.

So shouldi be turning the Polarcam on the polarscope....? A bit confused....

I am new so be gentle with me.... :)

Steve