[sac-forum] Re: Ultraviolet Venus Filter to Lend?
- From: Jeff <phxjeff@xxxxxxxxxxx>
- To: sac-forum@xxxxxxxxxxxxx
- Date: Mon, 27 Feb 2012 17:36:08 -0700
Hi Tom,
I have a photometric U band filter that came with a set. Since the CCD is not
sensitive in that band it has been of no us. You are welcome to it. I suspect
on a bright object like Venus with a time exposure it would produce an image.
Let me know if you are interested.
Jeff
Hopkins Phoenix Observatory
(187283)
Counting Photons
Phoenix, Arizona USA
www.hposoft.com/Astro/astro.html
International Epsilon Aurigae Campaign
http://www.hposoft.com/Campaign09.html
On Feb 27, 2012, at 5:32 PM, Tom Polakis wrote:
> Hi all,
>
> I was recently surprised to see some cloud detail in my image of Venus taken
> through a blue filter. As expected, the red and green filters showed no
> detail. The filter of choice for Venus is an ultraviolet-pass filter. This
> are sometimes referred to as "U" filters or sort of cleverly," U-Venus"
> filters. They are priced very high, as shown below, and Venus only presents
> enough size and enough of its cloud tops for a few months around 50%
> illumination, which is right now. Being cheap, I wondered if anybody might
> have a U filter just sitting in their case that I could borrow for a month or
> so to try my hand at Venus imaging.
>
> Let me know if you have one that's not in use, and I'd love to try it out.
> Again, this is a UV "pass" filter, and not a UV "cut" filter. Thanks.
>
> Tom
>
> ================
>
> Here's one from Baader that I think only exists in 2" size, and is priced at
> an outrageous $269.
>
> http://www.highpointscientific.com/product/BAD-FUV-2/Baader-Planetarium-U-Filter-2-FUV-2.html?meta=GBASE&metacpg=BAD-FUV-2&utm_source=gbase&utm_medium=CPC&utm_content=&utm_campaign=BAD-FUV-2
>
> ...or this one, in 1 1/4" and priced at a mere $140.
>
> http://www.optcorp.com/product.aspx?pid=12738&src=goog
>
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