Hello,
This morning, I tested another Quark filter with Sol'Ex spectro. This one is rather old, probably more than 6-7 years.
It is quite good, with an FWHM < 0.45 A measured in telecentric beam at f/45, so it is about 0.40 A in collimated beam.
The profile is very nice :
http://astrosurf.com/viladrich/astro/in ... -98-20.jpg
The FSR is 25.4 A.
The double-limb effect is very limited.
The downside is that it is very dark. Exposure times are much longer than with my double-stack system. The BF is probably rusted. I didn't try to remove the BF. I suppose this is the filter just before the telecentric ?
Detailed test here:
http://astrosurf.com/viladrich/astro/in ... ark-2.html
Measurement of another Quark chromosphere filter - much better ...
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Measurement of another Quark chromosphere filter - much better ...
Christian Viladrich
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Re: Measurement of another Quark chromosphere filter - much better ...
Hi Christian,
Image brightness could be a deteriorated blocker - I'm pretty sure they use soft-coated blockers. There is also the variability of the mica sample itself. And then again it might be a combination of these issues.
As far as the much improved FWHM performance, the variability between sample 1 and this much better sample is in line with anecdotal reports that such variation seems to be fairly common with the Quark.
Image brightness could be a deteriorated blocker - I'm pretty sure they use soft-coated blockers. There is also the variability of the mica sample itself. And then again it might be a combination of these issues.
As far as the much improved FWHM performance, the variability between sample 1 and this much better sample is in line with anecdotal reports that such variation seems to be fairly common with the Quark.
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Re: Measurement of another Quark chromosphere filter - much better ...
Thanks Christian, interesting to see the metrics you come up with.
Yes, they are soft coated blockers Bob, i've had 2 'rust' on me now. It's just an 'off the shelf' Andover filter that is used.Bob Yoesle wrote: ↑Sat Jul 02, 2022 11:05 pm Image brightness could be a deteriorated blocker - I'm pretty sure they use soft-coated blockers.
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Re: Measurement of another Quark chromosphere filter - much better ...
Hi Mark,marktownley wrote: ↑Sun Jul 03, 2022 4:07 am Yes, they are soft coated blockers Bob, i've had 2 'rust' on me now. It's just an 'off the shelf' Andover filter that is used.
Do you remember the diameter of the blocker ? It is 25 mm ? Can you confirm this is the filter we can see on the "telescope side" of the Quark? Maybe, we'll try and change it for a new one.
Christian Viladrich
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Re: Measurement of another Quark chromosphere filter - much better ...
Hi Christian, it is 12.5mm on a Quark Chromosphere, i'm guessing the combo will be 25mm
https://www.andovercorp.com/products/ba ... 600-699nm/
product code 656FS02-12.5 12.5mm
product code 656FS02-25 25mm
Mark
https://www.andovercorp.com/products/ba ... 600-699nm/
product code 656FS02-12.5 12.5mm
product code 656FS02-25 25mm
Mark
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!