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ERF Filter graph - Comparison
I set up the Baader spectroscope and checked the transmission of some of my filters. Unfortunately the responce of the Canon 350D chip did not record the UV-IR impact of either the Rosco filter ( or Karl's window tint filter)
You can see the $5 filter from Surplus Shed is almost identical to the photographic Wratten #25.
BTW the Surplus Shed filter is very similar to the one Oldfield uses (no additional UV-IR!!) Hopefully some solar photos to come.
I encourage anyone with a PST to consider adapting it to use a larger aperture; better resolution at low cost!!!!
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