|
Even with a modded camera only a quarter of the pixels on the sensor will usefully pick up HA. As for O3 as this wavelength lies on the overlap of the Bayer filters of the green and blue pixels on your sensor you are using three quarters of your useful pixels as green pixels are half of the total and blue like red a quarter. The real advantage is increased signal to noise. Exposures can be far longer as the total number of photons over a given exposure is far less. Any light pollution is also minimised to only be recorded for the bandpass of the filter being used. Do not think that the Moon is no problem as it can give very nasty gradients depending on where it is to your target and how bright it is.
If you live in a light polluted area it is the only way to get faint nebula data. Patience is a useful attribute as it can take several nights to get a decent image.
Is it worth it ? Definitely as it can be quicker than going to a dark sky site and be beaten by the weather.
Bert
|