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Old 30-09-2016, 09:27 AM
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bojan
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Join Date: Jul 2006
Location: Mt Waverley, VIC
Posts: 6,123
I just repeated the (visual) measurement with Energy saving lamp as reference.
The line I was monitoring (650.5nm) is marked with ellipse on the attached annotated spectrum of the lamp (it is quite faint).

Summa sumarum: Without Rocolax filter it is visible, with filter it is not.
Conclusions;
- I have made a mistake with first measurement reported earlier (it is not easy to pinpoint the cutoff wavelength visually)
- Rocolax filter is NOT good for Halpha (contrary to manufacturer's claim and supplied transmission curve) (I contacted them and asked for advice)
Attached Thumbnails
Click for full-size image (calibration.jpg)
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Last edited by bojan; 30-09-2016 at 04:19 PM.
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