narrowbandpaul

Good post Olly,

Hope they fix the backlash issue, especially given the cost of the mount.

Glad it is living up to the hype in other areas. Certainly a mount to keep an eye on.

Paul

Hi Nick,

just for clarification as to the nomenclature used in emission line imaging.

The number after the element referes to the state of ionisation. For O[iII], the oxygen atom is missing 2 electrons. In S[iI], the sulphur atom is missing just one electron.

The square brackets denote a forbidden line. This is a state which is very long lived, which can only exist in low pressure/density environments like space.

The Ha line for example is an allowed transition (from the 3rd energy level to the second).

Cheers

the paramount ME is made by the Bisque brothers, no?

very very interesting.....

interesting, since light images experience fixed pattern noise, which is removed with flats, and since dark frames have dark fixed pattern noise, could one flatten a dark to remove dark fixed pattern noise.

Its worth an experiment......

paul

i believe some manufactures add some fluorite CaF2, rather than the pure cyrstal. Ie they are lying a bit...some arent true fluorite.

thats what I believe.

very good martin...

isnt the saying..."a filter is worth a 1000 words?"