|
Just 2x2 bin the ST-237 guide chip to boost the sensitivity - "no brainer". If you're a Ha purist the 4.5nm is a lovely filter. I use the 10nm with the FSQ/STL11k. Its ok. Be careful with very fast optical systems such as camera lens (F/2.8 or F/4) and narrow bandpass filters. The angle at which the light strikes the lens is wider. This causes the Ha filter to shift its bandpass to a shorter wavelength. If the filter is very narrow, say 3nm, then it could miss the 656.3nm emission line altogether. You wont have problems with the FSQ or 12.5" RC with either of the filter selections you mention.
|