image intensifer with 0.7nm ha filter
Posted 06 December 2012 - 09:03 PM
With image intensifier
Very smooth image
Posted 06 December 2012 - 10:29 PM
Posted 06 December 2012 - 11:16 PM
10A = 1nm
but I will check with spectroscope tomorrow
yes normally for solar - but solar Ha and I got a couple have low tramsmission rates
50 pct or less
this one for night sky has 80 pct
so II does not get photon starvation
I tried solar Ha on II - NG noise level skyrockets
i tried new one on horsehead tonight - best view in II so far
Posted 07 December 2012 - 04:37 AM
5-10 A is good form proms only for solar Ha filter types
a true solar filter to see surface has to be 1A (.1nm) and lower (0.7A)
thats 10 times more narrow than this filter
Posted 07 December 2012 - 11:36 AM
Posted 07 December 2012 - 12:13 PM
10nm is the most open one I have
Also you must use shields from stray light
Do you have layout and any pics
Posted 07 December 2012 - 12:30 PM
Your gallery is phenomenal. So the images you captured with your Canon are similar to what you see visually? And these were taken at a dark site, not city and without Ha filter?
Do you have any Ha filtered images?
Posted 07 December 2012 - 12:37 PM
60 miles from center of Manhattan
Photos slightly brighter than human view
But all that is in photo you can see
Posted 07 December 2012 - 08:07 PM
I have used a 7nm (Baader) and 12nm (Astronmik) h-alpha filter with my II's with great success on HII regions.
I am VERY surprised to hear that a 0.7nm filter would give you sufficient light input without light starving your II. Where did you get this filter from?
Posted 07 December 2012 - 09:41 PM
There is as far as I know this the most narrow filter
For night time
Posted 07 December 2012 - 10:37 PM
Posted 09 December 2012 - 11:55 AM
Posted 09 December 2012 - 12:31 PM
SII second best because its in red region
OIII nuttin much I3 do not work well in green area
when weather breaks ill try to get some test shots
until then nuttin to do but drink a little
Posted 09 December 2012 - 02:04 PM
A question for ya...
I thought Etalon is the popular mechanism to deliver sub-nm scale narrow-band imaging, while Omega Optical makes a lot of interference filters which rarely go narrower than 10nm?
Can you describe the narrow-band filter you use?
Posted 09 December 2012 - 02:34 PM
like pst and lunt solar scopes .5-.9A - that is less than
1A and 10A = 1nm (etalon = mucho money)
Omega Optical method 10nm = 100A are the relative easy ones
but their method can go down to 1.5A (uh price goes up)
this narrowband is 7 to 8A interference filter
lately there has been progress in mnfg methods
once weather breaks im hoping to take series of shots
it real cool looking thru a 1nm filter - you can see just how narrow it really is
the h-alpha line is about 1.2A wide
here is shot thru my spectroscope - the thick line
is ha - just think an etalon 'Goes inside that line!"