Quote:
Originally Posted by Terry B
I take lots of images through a "I" photometry filter.
The passband is in this graph.
http://www.astrovid.com/other_images...ilterchart.jpg
Using my ST10XME the exposures need to be about 50% longer than R to get equivalent levels in the image but they are much brighter than B or G exposures.
As for terrestrial imaging. I remember using IR film and it worked best with bright sunlight. Green things like trees reflected lots of IR but needed bright sunlight to do this. Images were very washed out if it was overcast.
I don't think that you would get much at night. |
Thanks Terry. Pity about terrestial, but what you say makes sense. The I filter is above Ha, so I might give this filter a shot with the ST10, It would allow a different colour pallet with other NB filters.