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NGC2301

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gardenfish

Kiloparsec

Posts: 1030

Joined: Fri Feb 05, 2016 9:18 am

Location: Phoenix Az.

Post Sun Feb 05, 2017 11:28 am

NGC2301

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 1161 times
Takahashi TSA120 - SV70T
CEM60 - PierTech2 pier
QSI6120 WSG-8
Astrodon 31mm LRGB E Series -Ha-3nm - OIII-3nm - SII-3nm

G3 Mono - ASI290MM Mini - ST80

ES 152 AR - Atlas mount
16" goto Dob

Nikon D5200 Modded

Roll-off roof Observatory
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Doug

User avatar

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

Posts: 6416

Joined: Tue Dec 23, 2008 11:41 am

Location: Temecula, California

Post Sun Feb 05, 2017 12:04 pm

Re: NGC2301

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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CPC800, 60MM Classic Refractor, EON72, EON120, Atlas EQ-G, SSPro V1, SSAG, IDAS LPS Filter, TRF-2008
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gardenfish

Kiloparsec

Posts: 1030

Joined: Fri Feb 05, 2016 9:18 am

Location: Phoenix Az.

Post Sun Feb 05, 2017 12:39 pm

Re: NGC2301

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.
Takahashi TSA120 - SV70T
CEM60 - PierTech2 pier
QSI6120 WSG-8
Astrodon 31mm LRGB E Series -Ha-3nm - OIII-3nm - SII-3nm

G3 Mono - ASI290MM Mini - ST80

ES 152 AR - Atlas mount
16" goto Dob

Nikon D5200 Modded

Roll-off roof Observatory

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