[AZ-Observing] Re: February 2010 Report from Hovater Norte
- From: Gene A Lucas <geneluca@xxxxxxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Mon, 15 Feb 2010 16:59:07 -0700
Another possibility -- use the David Levy designed, Leo Heinzl inspired,
"Pickle-Tron" eyepiece shield (inside joke from the 1970s...don't ask!)
This consists of a standard bathroom tissue (toilet paper) inner
cardboard sleeve, cut off to desired length, and painted black all over,
esp. inside.
(AFTER the paint dries....!) Merely interpose it over the eye lens of
the eyepiece, and place your eye snugly against it. This fits 1-1/4
inch eyepieces.
Or, for 2 inch size eyepieces, you could try a short length of the black
color foam plastic insulation tubing for water pipes, available in
several sizes, from ACE hardware (amongst other fine stores...) Select
one that will fit snugly over the eye lens, and cut to a short length to
match the eye relief on your favorite eyepiece...
I will also note that the excellent optical quality Hyperion Baader
eyepieces are just about the only series that are equipped with special
threads ON THE EYE LENS END for various adapters (mainly for projection
imaging), and also have rubber light shields that are longer, flexible,
removable, and actually effective... I believe you can also get a
threaded adapter that will mount 2 inch filters _on the eye lens_ of
those eyepieces...
I have also seen "turret" adapters that will mount either 1-1/4 inch or
2 inch filters on a rotating disk, for quick comparisons... Mounts under
the eyepiece in the light path... Probably can mount a light shield on
one of those for visual use... (but moderately expensive overall....)
Cheers,
Gene Lucas
(17250)
My opinions are my own alone... get some of your own...
Tom Polakis wrote:
> ---- L Knauth <Knauth@xxxxxxx> wrote:
>
>
>> BTW: I always have trouble "blinking" with the OIII filter. Too much
>> ambient light reflecting off the glass surface. Is there any trick other
>> than using a dark cloth? I get a little uncomfortable scrunching a dark
>> cloth over my head with one hand while flipping an OIII filter with the
>> other, all while twisted to the side and 4 feet up a ladder.
>>
> As you say, the reflection off the filter prevents the blinking method from
> working, even at the darkest sites. If your dark cloth is large enough,
> though, it should stay put without having to hold onto it. Another, more
> desirable option is a shield around your focuser, like this one that Chuck
> Dethloff in Oregon constructed.
>
> http://www.bbastrodesigns.com/osp01/chuck-shield.jpg
>
> You can see that the semi-circular shield rotates to block out the light from
> the sky or horizon. It stands about 6 inches out from the scope, so your
> head is pretty much immersed into an area that is nearly free of extraneous
> light.
>
> Tom
>
[Earlier stuff Snipped to make THE NET NANNY happy -- GL]
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