Can you use a Daystar filter minus ERF for DSO?

[NickK]

This has probably been mooted around before but the Daystar package requires an ERF for solar, however for non solar (ie DSO) could you use the f/30 for bright DSOs or planets?

It's probably unlikely that someones' actually tried this but I was wondering...

[michael.h.f.wilkinson]

I doubt it. The bandpass of the Daystar filter is in the order of 0.7 Angstrom or 0.07 nm. The typical bandpass of a DSO H-alpha filter is 100 times larger

[NickK]

I doubt it. The bandpass of the Daystar filter is in the order of 0.7 Angstrom or 0.07 nm. The typical bandpass of a DSO H-alpha filter is 100 times larger

Good point.. trying to think if a daystar or a spectrograph would add some addition interesting ideas to the scope

[Merlin66]

You could better use a spectroscope....

It will give far more spectral detail over the whole visible spectrum.

It can then be incorporated into a spectrohelioscope to assemble scanned solar images at ANY wavelength - Ha, Hb, Fe, CaK etc etc etc.

Has the potential to give much higher resolution than a Daystar/ Lunt/ Coronado.

[NickK]

Wooo.. I had a read of a few of the links.. a promising idea.

I think it would be possible to create a fast scanning spectrograph. In one example he's used a nodding mirror attached to a motor - there's faster ways of doing this with less mass. The result will be a faster scan and less deviation across the image.

question is - could I build something that sits on the Pentax and still be able to sit on the EQ6..