NGC2301

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gardenfish
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NGC2301

Post by gardenfish » Sun Feb 05, 2017 11:28 am

I put in the new Astrodon lrgb filters and decided to try a small cluster to try them out. I saw a couple nice pics online with 10-180s lum, 5-360s rgb each. So that is what I did. I refocused each filter and there was a difference, not as parfocal as I had hoped.

I need to figure out how do do the offsets in SGPRO so I can use them instead of auto focus when shooting. Any tips?????

Here is just the 5 each 360s rgb's, no lum yet. Much better than my other clusters last year. I used 30-30-30 in levels blackpoint, I tried 50-50-50 and its a little lighter so I may re-do it
2301.jpg
2301.jpg (111.29 KiB) Viewed 2478 times
ES127CF FCD100
CEM60EC on PierTech 2 in Roll-off observatory

Takahashi TOA150
CEM60 out side pier

SV70T

QSI6120WSG-8
Astrodon LRGB
3nm Ha-OIII-SII

ST80 - AT60MM Guide scopes
G3 mono - ASI290MM Mini Guide camera's

Nikon D5200 Full Mod

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Doug
The good thing about science is that it’s true whether or not you believe in it. ― Neil deGrasse Tyson
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Re: NGC2301

Post by Doug » Sun Feb 05, 2017 12:04 pm

gardenfish wrote:I put in the new Astrodon lrgb filters and decided to try a small cluster to try them out. I saw a couple nice pics online with 10-180s lum, 5-360s rgb each. So that is what I did. I refocused each filter and there was a difference, not as parfocal as I had hoped.
I'm noticing that too, about parfocal. My L and Ha seem to match close enough, but, SII and OIII are considerably different. The stars are out of focus when I use Ha focus. I typically like to rotate between all filters as I image. I'm just wondering if I use the offsets if that will make it worse. You know, moving the focus just 10 micro steps can make a difference. But, I think you're right, we need to try to use offsets.

As far as SGPRO goes, I wanted to get it, but, I found out Apogee doesn't make an ASCOM driver for my camera....WTF!?!?! Yep, never buy Apogee, their customer support is horrible. They don't make drivers for the cameras they build.

It seems MDL does have some kind of wrapper where I can use Apogee camera, but, ASCOM is a standard and without the Driver, I can't use SGPRO just yet.

BTW, your star colors look good. Seems the blue is a little faint though.
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gardenfish
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Location: Phoenix Az.

Re: NGC2301

Post by gardenfish » Sun Feb 05, 2017 12:39 pm

From what I understand you take a few different pictures with each filter and note the step # for perfect focus with the baht mask of each filter. Take an avg if they are slightly different .Then use one filter to focus with and its offset will be zero then the next filter will move the # of steps in the offset to perfect focus and so on. So it should be perfectly focused every time. It may just be 5 steps or more or less but sill be perfect focus. Even if the temp is different at start it will still move the correct # of steps to perfect focus. Because of backlash I read to try and get all the offset steps moving in the same direction.

This sure sounds better and easier than autofocus.
ES127CF FCD100
CEM60EC on PierTech 2 in Roll-off observatory

Takahashi TOA150
CEM60 out side pier

SV70T

QSI6120WSG-8
Astrodon LRGB
3nm Ha-OIII-SII

ST80 - AT60MM Guide scopes
G3 mono - ASI290MM Mini Guide camera's

Nikon D5200 Full Mod

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