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Lunt LS50FHa or LS60FHa solar filter. Not a double stack one! Wanted

Price - $1.00

Ad Number: 185896

Posted: 09 Oct 2019

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Hi all,

Will pay a premium price if the filter is exactly what I am looking for!
Please, read carefully to understand what I am looking for.

I am seeking for a Lunt LS50FHa or LS60FHa filter which is standard filter for use as a main filter
for H-a observing.

I do not need a filter which is for double stacking!
All filters for double stacking require too much tilt to come to H-a core.

What kind of filter I am looking for:

1. Standard front mounted filter, not for double stacking.

2. The filter should not require or require a really minimal tilt (to come to the best contrast) being used at about sea level altitude (not higher than 70-80m ).
at atmospheric pressure about 29.50 inch Hg - no tilt required (tuning wheel in the marginal position counterclockwise.
at atmospheric pressure about 30.00 inch Hg - very little tilt required (tuning wheel require a little - about 1 revolve from the marginal position counterclockwise).

3. Filter must have high contrast view of the solar details:

a) active areas should really shines over the sun background
b) dark filaments should be really dark (while not black, of course)
c) mottling in the "desert areas" should be very easily seen in all parts of the solar disk.

4. Proof images taken with the filter are required.

Thanks for reading.


Valery

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  • Location New Jersey.



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