OT but a question on DSLR filters???

Use this section to discuss "standard" Baader/Coronado/ Lunt SolarView/ Daystar, etc… filters, cameras and scopes. No mods, just questions/ answers and reviews.
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Merlin66
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OT but a question on DSLR filters???

Post by Merlin66 » Fri Jul 20, 2012 10:07 am

I recently modified my Canon 1000D to provide a FULL full spectrum mod.
This involved removing both the colour correction filter (the one normally removed for improved red response) and the front anti-alias/ dust shake filter -which acts as a UV-IR cut filter.
When I tried the camera with only the colour correction filter removed I found a definate cut-off at 400nm and 700nm. This was extended to <380nm and into the NIR after the second filter was removed.
I have various spectra which show this result...
I was therefore surprised to see a "test" by Gary Honis on a camera with only the correct correction filter removed which seems to show a positive response to an IR LED (from the web this seems to be around 950nm)
http://ghonis2.ho8.com//Tests/LPF2starbloat.html
How can this be???
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solarchat
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Re: OT but a question on DSLR filters???

Post by solarchat » Fri Jul 20, 2012 1:23 pm

Just a note here, when I was at SCAE I sat and listened to the Hutech rep explain to a potential customer how the H-Alpha line was at 640nm and that all DSLR's were designed to cutoff everything below 700nm and that his upgrade would allow the DSLR to take pictures of the H-Alpha line at 640nm...:)

I just walked off
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swisswalter
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Re: OT but a question on DSLR filters???

Post by swisswalter » Fri Jul 20, 2012 2:42 pm

:silly:
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)

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marktownley
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Re: OT but a question on DSLR filters???

Post by marktownley » Fri Jul 20, 2012 2:46 pm

How can this be???

In the plumbing trade I believe this is described as a load of ball cocks... :whistle: :silly: ;)
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Re: OT but a question on DSLR filters???

Post by rsfoto » Fri Jul 20, 2012 4:37 pm

Hi Ken,

I have 2 modded DSLR, one EOS Rebel made here in Mexico and one Hutech EOS 20D. I will test it next week with my LISA and see what happens.
regards Rainer

Observatorio Real de 14 San Luis Potosi Mexico

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