hallo ,
ich habe innerhalb kürzester Zeit Antwort bekommen ,wirklich toller Service ! :
ich hoffe den Inhalt hier wiedergeben zu dürfen
ist ja Antwort auf die sehr wichtigen Fragen
" Hello Hans!
The Calcium Quark must use the UV/IR blocking filter.
This is because the colored glass front mount ERF filters will block calcium light.
Also, the Baader brand UV/IR cut filters will also block the 397 wavelength. They cut off above the calcium line.
There are not a lot of choices other than the UV/IR cut filter for Calcium. So this is really THE solution.
We suggest you will want to use the Calcium Quark at F/8 and above only.
The F/8 image will be bright, but up by F/15, the image will be much higher contrast.
We have not found anyone who has trouble with the higher H-line wavelength unless he is already colorblind in the blue.
Many customers who have cataract surgery in one eye can see K-line only after surgery but they can still see H-line in the bad eye.
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I do not know enough about the Baader filter to know why he is advising for only photographic use.
That could be partly because his filter is K-line.
I only suggest K-line in photographic applications because we cannot guarantee the older client can see the image at all.
You can imagine how unhappy you might be if you spent a lot of money for a Calcium K-line filter and receive the new toy and not be able to see anything.
H-line filters are made for either photographic or visual use.
We have been making H-line filters for more than 10 years.
Just be aware that the Baader UV/IR cut filter will not pass the Calcium lines, so you need a different brand of energy rejection filter.
Astronomik brand UV/IR cut filters are tested to pass both Calcium lines.
That ERF is used to reduce the heat load in your equipment where the concentrated beam hits.
The ERF is not about eye safety.
Another important concern for eye safety is the off-band blocking of a filter.
All Daystar filters are guaranteed to safely block from X-ray up to 2 microns.
Again, without the specifications of the Baader filter, I do not know what his far off-band blocking specifications are.
We only know ours and our products are all manufactured with this safe transmissions above and below the visual spectrum.
Clear skies!
Jen
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