My Astronomical Filters

 

I used my new Alpy600 spectrograph from Shelyak Instruments to analize my astronomical filters.

I exposed an image with and without the respective filter, using an Halogen lamp and a light diffusor. By dividing the first by the second and normalizing the result, I obtained the filter response.

The LRGB filters from Astronomik are very well balanced.

The narrowband filters of 13 nm bandwidth  show a broader bandwidth but include well the two OIII lines, the H-alpha line and the two SII lines. The 6 nm H-alpha filter, is slightly decentered from the H-alpha kine:

These filters do not have frabricant, and the only one with some quality is the IR-Pass. The nebular misses H-alpha completely.

 

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