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Webcam imaging with SPC880

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#151 Alex Post

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Posted 09 October 2010 - 08:33 PM

Here is some preliminary results:

I shot 6 sequences, 3 each for Canon XSi and SPC880NC. I tried to match two as close as possible given my equipment list. SPC880 image was reduced in size to match the apparent size of Jupiter taken with XSi, 13m EP, and 5x barlow.

It appears that results are comparable, at least in my mediocre seeing conditions, with perhaps Canon having slight advantage over SPC.

Attached Thumbnails

  • 4104354-xsi_vs_spc880_compare.jpg


#152 flboy

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Posted 10 October 2010 - 05:33 AM

Alex ~ did you take the Canon photo via Afocal? The reason I ask is because you list the 13mm EP.

#153 Alex Post

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Posted 10 October 2010 - 08:36 AM

John, no, not afocal. It was EP-projection.

Here is a link to the detailed explanation.

A summary:
1. Prime focus uses no eye pieces (EPs) and no camera lenses.
2. EP-projection focus uses an EP.
3. Afocal uses both EP and a camera lens.

#154 flboy

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Posted 10 October 2010 - 12:11 PM

Many thanks Alex! I never heard of EP-projection and the power point presentation was excellent!

Now that the moon is waxing, I'm hopeful to get some decent Afocal shoots. The biggest problem that I had was centering Jupiter. Just a touch of the control arrows on the HC & it zoomed out of the LCD. But Greg showed me how to slow down the slew speed, which really should help.

I love learning new stuff, especially when it's fun :)

#155 flboy

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Posted 13 October 2010 - 03:30 PM

Eddie ~ I came across this webcam:

http://bestofferbuy...._campaign=gbase

free shipping out of Hong Kong

For $15 bucks, I thought I'd give it a shot.

#156 flboy

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Posted 13 October 2010 - 04:12 PM

ps If it does work, my daughter can always use it. :)

#157 Arctic_Eddie

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Posted 13 October 2010 - 04:19 PM

You'll have to come up with an adapter to mount it to the EP for afocal. For testing, you could hold it down with a large rubber band.

#158 flboy

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Posted 13 October 2010 - 04:45 PM

Yep! I'll have to make a modified adapter. I emailed the company asking for some details like: how many pixels, type of sensor used, color or b/w??

I'll copy you if you like?

#159 haytor

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Posted 14 October 2010 - 05:56 AM

flboy,

good luck with that web cam, i hope it works out for you, one thing of note is the very short USB cable, its only 28" in max length, so you would need an extension USB cable to use it. Just a thought!

Tom.

#160 Arctic_Eddie

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Posted 14 October 2010 - 09:05 AM

I looked for info on the camera and found only copies of the same ad with no mention of details. I'd like a copy if they send you something technical. You might be able to just lay it across the EP exit and hold it down with a big rubber band over the top of it and the underside of the diag. You can try it in daytime to see if it will focus.

My 880 is due in the next three days.

#161 flboy

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Posted 14 October 2010 - 12:05 PM

Hi Tom ~ I took a shot in the dark with this webcam :)

I didn't notice the cable lenght, but fortunately I'm able to get my laptop right next to the scope. So hopefully it'll work as is.

Thanks for the heads up!


Hi Eddie ~ I'll copy you on the reply, which I should have by tomorrow.

#162 haytor

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Posted 14 October 2010 - 12:33 PM

[quote name="flboy"]Hi Tom ~ I took a shot in the dark with this webcam :)

I didn't notice the cable lenght, but fortunately I'm able to get my laptop right next to the scope. So hopefully it'll work as is.

Thanks for the heads up!


Hi again flboy,

my only concern is that although you can get your lap top right next to your scope, the problem arises if you decide to slew your scope to another area of the sky, should you forget about the distance your scope is likely to move during a slew, you will find the USB cable from your web cam will either pull free of the lap top, or worse still drag your lap top which could end up a disaster.

I would highly recommend you get a USB extension, they are very cheap to buy and would save any distaster that could befall you!

Tom.

#163 Arctic_Eddie

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Posted 14 October 2010 - 01:05 PM

Good advice from haytor on the USB cable. If it wraps around the scope it can pull the laptop off the table. A simple extension can get you up to about 15' but an active extension will get you out to 15' then passive for another 15'. Here's the one I use from USBGear in Clearwater. I have strung three together with a passive on the end for about 50' to a webcam.

http://www.usbgear.com/USBG-2U16.html

#164 flboy

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Posted 14 October 2010 - 01:55 PM

If it works, then I'll get an extension. But it has to work 1st :lol:

FYI: when using the NexImage, I've gotten into the habit of removing it from the star diagonal prior to slewing to another object. Then I set back up.

#165 Arctic_Eddie

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Posted 14 October 2010 - 02:53 PM

I normally use a 0.5x reducer on my Orion for two reasons. First, the FOV is quite narrow and I want it a little wider for DSO work. Also, anything screwed into the camera makes a good dust barrier. This is important if you take it off often and especially if you lay it face up. You could also use a simple IR or UV filter for less cost.

#166 flboy

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Posted 15 October 2010 - 04:52 AM

Here's the reply from the factory:

"Please be advised that it is color and 1.3mpixels."

#167 Arctic_Eddie

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Posted 15 October 2010 - 06:10 AM

I think that translates into 640x480 ??? color and likely CMOS. If you can get it mounted solidly, it might turn out to by quite useful for astro work.

#168 flboy

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Posted 15 October 2010 - 07:21 AM

That's what I hoping for(useful for astro work) :)

#169 flboy

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Posted 25 October 2010 - 07:50 AM

I got n email from the company saying that the color that I ordered was no longer available, but that they had other colors. Since two weeks have gone by and I'm not really even sure it will work, I canceled the order and they refunded my money within 24 hrs.

I'll stick to the NexImage and then after I learn all of the software, then I'll look into a CCD for DSO's.

By the way, is it the full moon that's keeping you all from posting your webcam pics?


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