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Solar Filter Help

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#1 Terreb

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Posted 06 February 2004 - 08:41 PM

Hi.
Can anyone recommend a solar filter for my Celestron 9.25 ? :question:
I want to "get ready" for the Venus transit in June.
The only filter I can find, so far, is the Thousand Oaks - Type 2+ full aperture glass filter from Astronomics.
Cheers !

#2 Dennis

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Posted 06 February 2004 - 09:03 PM

I haven't seen one specifically for the 9ΒΌ, but think that a carefully, very carefully constructed filter using Baader filter material is the best potential. I'm also looking forward to sunrise on June 8th. I've got a friend on a hill facing east that serves coffee! The transition will already be in progress at sunrise here.

Where are you? would you consider bringing donuts?

#3 Suk Lee

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Posted 06 February 2004 - 09:28 PM

Dennis:

You can buy Baader filters readymade for your OTA at:

http://www.kendrick-...larfilters.html

alternatively, the cell is very easy to make, I have instructions at:

http://home.att.net/...ilter/root.html

A bunch cheaper!

Cheers,
Suk

#4 Terreb

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Posted 06 February 2004 - 09:31 PM

:cool:
Thanks Dennis, I'll look into the DIY approach.
I'm in Mendon MA. That's south on I-495 from you.
I could bring the doughnuts, but we'll probably end up fighting my dog for them!
I'm somewhat screened by trees in the east at home, so I'm looking for a friendly viewing site.
Cheers.

#5 Terreb

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Posted 06 February 2004 - 09:44 PM

Suk,
Thanks.
I like the site with the DIY instructions. Looks like I could be busy one rainy weekend !
Cheers. :waytogo:

#6 Guest_**DONOTDELETE**_*

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Posted 06 February 2004 - 10:29 PM

I would recommend Thousand Oaks Opticals solar filters.

http://www.thousando....com/solar.html

They are well made. When your dealing with the sun and your eyesight its worth investing in a good quality filter.

#7 Suk Lee

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Posted 06 February 2004 - 10:42 PM

If you're worried about safety with Baader, the film is very tough, and is optically flatter than the float glass used in Thousand Oaks filters.

Cheers,
Suk

#8 Gary BEAL

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Posted 06 February 2004 - 11:16 PM

I'm with Suk, Baader is the way to go. Do it yourself, and you will have a very effective, and cost effective filter. I have them for all my smaller refractors. In the 9.25" size maybe think of an off axis filter.
Gary

#9 wilash

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Posted 07 February 2004 - 12:02 AM

I'll add a third vote for Baader. With a couple of sheets I made filters for a 5" Mak, 80mm refractor, and 80mm binoculars and still some left for the finderscope and 7X50 binos. It seems very durable, I've been using the same filters of over a year and no signs of pinholes.

#10 Dennis

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Posted 07 February 2004 - 09:01 AM

Many thanks Suk! :) I too will opt for your homemade version. I've got some leftover foamboard from an earlier project. Clear days! :lol:

#11 Terreb

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Posted 07 February 2004 - 09:20 AM

Thanks folks for all the good info.
I'll probably do both, glass and Baader....and then one for the finder as well !!!! :lol:
That's the problem with amateur astronomy, it's easy to spend more than you've got !
I'll be ready for June.......and for some warmer weather!
Cheers !

#12 Trever

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Posted 07 February 2004 - 03:13 PM

Yeah tell me about it. I was planning on spending only 300 dollars when I first bought an 8 inch Dob. Now after about 5 months, I traded the dob for a 6 inch refractor and bought filters, eyepieces you name it. 1000 dollars so far and climbing. And I am not through yet.. :)

#13 Tom L

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Posted 07 February 2004 - 06:17 PM

:lol: Gotta love this hobby! Hope your filters are keepers!

#14 Suk Lee

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Posted 07 February 2004 - 06:20 PM

My wife asks me: "so, are you done yet?"

I don't tell her: "when I'm dead" - no point giving her ideas.

:lol: :lol: :lol: :lol: :lol:

#15 Tom L

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Posted 07 February 2004 - 06:30 PM

:roflmao:

#16 Trever

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Posted 07 February 2004 - 08:54 PM

The filters are top notch. I havent recieved the solar filter but thousand oaks is a nice company and the filter is unused. My next purchase I believe will either be a digital camera or toucam.

#17 Terreb

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Posted 08 February 2004 - 08:37 AM

Good job my wife doesn't look at CN .....yet...
or my pocket money could be restricted! :whistle:
...I just ordered a William Optics focuser for my SCT....I couldn't resist it!


#18 LivingNDixie

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Posted 09 February 2004 - 11:37 AM

Terry,

Whats the story Wishbone???

Sorry just the words Jack Russell Terrier bring that out of me... Ok looks like I'm showing my age...err maturity level now

#19 Terreb

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Posted 13 February 2004 - 10:53 PM

Well I did it....

...I bought the Thousand Oaks filter....

....now for the Baader !

Cheers !

#20 Terreb

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Posted 18 February 2004 - 10:23 PM

I received the Thousand Oaks filter today.

My wife e-mailed me at work. Her message said....
...."I thought it was too good to last....UPS called today !!!"

The TO solar filter is very very nice quality. It's like a mirror !

It came with some adhesive felt tape so that you can adjust the fit onto the OTA to be snug, but not too tight.

...Now I need a nice cover to store it in when not in use !!!
....UPS again !!!

:help: :help: :whistle: :whistle:

#21 synner

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Posted 19 February 2004 - 01:32 AM

...."I thought it was too good to last....UPS called today !!!"


Unfortunately, that sounds very familiar. :grin:

Nick

#22 Peter Argenziano

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Posted 20 February 2004 - 01:18 AM

Now I need a nice cover to store it in when not in use !!!



I store my Baader solar filter, which is mounted in a metal cell, in a Rubbermaid container. The container is 'Tupperware-like' and is about 8" in diameter, providing a snug fit for the filter. Economical too.

Peter

#23 Trever

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Posted 20 February 2004 - 04:26 AM

I purchased a used TO solar filter too made to fit a r inch RV6. My tube is slightly smaller. But nothing some more felt tape wont cure... Looks to be of high quality/


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