From: Ray Byrne <ray@in4media.co.uk>

Date: August 2, 2012 3:08:05 PM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] Cooling Fins

Hi Milton,

I was under the impression that cooling a camera was a necessary thing to do only for DSO imaging. Both my DMK and PGR camera get quite hot but I'm using them for Solar/Lunar/Planetary only. Is it a noise issue and would cooling help reduce noise in planetary imaging?

Ray

On 2 Aug 2012, at 19:19, Milton Aupperle wrote:

Hi Bill;

I have a separate 3 amp power supply for my Peltier cooler and it
brings internal case temperature down by 25°C. The HEQ5 needs 2.5 amps
to run reliably.

On a side note most of the PGR cameras use the front C-Mount plate as
a heat sink. So cooling the piece of metal around the C-Mount would
more efficiently cool the Camera -rather than the whole case.

If i had the money, I'd look at building a new metal case or an
extended metal front plate for the Grasshoppers that had cold point to
cool the CCD "pocket". So it would draw less power and need a smaller
fan as I'm cooling a smaller area.

HTH..

Milton Aupperle

On 2-Aug-12, at 11:48 AM, Bill Pearce wrote:

> Thanks Milton. I ordered two. It's worth the fourteen bucks to see
> how well they work. I have a Brass/Copper one of that size with a
> cooling fan of the same size attached, but haven't tried that yet. I
> made a Peltier cooler, but it required a large heat sink and fan.
> Works real well, but does pull lots of power. (enough to require a
> separate power supply) it overloaded my mount's Pyramid regulated
> power in about two hours running it with the mount tracking.
>
> Bill