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Author Topic: Focusing on one target.  (Read 282 times)

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Offline Annie

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Focusing on one target.
« on: 10:01:00, 23 November, 2017 »
Until now I have been quite content with acquiring just 2/3 hours of data on a range of targets but would like to move on to acquiring much more data on one specific target - the obvious one at this time of the year being the Orion Nebula.  It would be good to have some advice about the range of exposures I might try with my set up: NEQ6, Takahashi 106ED  and either my unmodded full frame D600 or modded crop sensor Canon 550D.  I work on the basis that exposures exceeding 600secs produce too much noise on a DSLR?

Annie
Pulsar Observatory; NEQ6/EQ6 wedge; HEQ5 Pro; TS Star 71 Astrograph; Takahashi FSQ 106ed; Skymax 150 Pro; Nikon D600; Canon 550D modified; Canon 5D Mk11; ZWO ASI120 MM-S; Lacerta MGEN stand alone guider.

Offline Nimbus

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Re: Focusing on one target.
« Reply #1 on: 11:18:02, 23 November, 2017 »
Hi Annie, as you know I don’t use a DSLR and have never done so. However, you will appreciate that you are trying to prevent core from blowing out and retain the detail and separation of the stars in the trapizium.

I would suggest 5-10 secs for the trapizium. The next set I would aim for about 30 secs followed by 300 secs. Obviously it all depends on how sensitive you cameras are. Hopefully these times are in the ball park and should serve as a baseline to adjust up or down when you examine the image.

HTH Jim
EQ8 Pro
TAK FSQ 106 EDX IV
ATIK 16200 Mono, Atik OAG, Atik EFW3 2" LRGB S2 8.0nm /Ha 3.5nm/O3 8.5nm, Baader Filters, Lodestar Guider, Focusmax4, Robofocus
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Offline mechanoid

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Re: Focusing on one target.
« Reply #2 on: 11:33:54, 23 November, 2017 »
Hi Annie

I used to use 600 sec exposures on my modded Canon DSLR, which worked fine at this time of year as the nights are generally cooler.  You'll also need to take some shorter exposures (perhaps only 5 seconds) in order to get the Trapezium stars, which will be burnt out in a 600 sec exposure.

I reckon that this is actually a fairly challenging target because of the need to blend exposures together, but it does yield stunning images. I used a blend of 5, 30 and 600 seconds for my best image so far.

Have you considered the Flame / Horsehead nebulae as a target ?  This also produces excellent images, but only needs a series of 600 sec. exposures.  The best image I have to date was taken using my DSLR.

In my experience its not the total exposure time or camera type that most governs picture quality, its sky transparency. I reckon that if I can't see the Andromeda galaxy with the naked eye, I'm probably wasting my time with faint deep sky objects. But the Orion nebula is bright enough to yield good images even on relatively poor nights.

Dave
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Offline chris.bailey

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Re: Focusing on one target.
« Reply #3 on: 11:47:19, 23 November, 2017 »
Annie

All good advice so far on M42 and yes it is challenging, as is M45! M42 is still quite a late evening object and a bit low for my liking. Much better to leave it another few weeks yet IMHO.

I always find that 5 hours worth of data is quite a significant break point when it comes to imaging. After that you need to add significantly more to gain appreciable benefit. So thats 30 x 600.

I don't know if you are dithering your subs but adding a large dither (10 pixels or so) can really help combat some of the DSLR noise issues.

Chris
LX200|ZS70|FSQ85|FLT110|Altair DF250RC|EQ6 Pro(Rowan Belt Mod)|ParamountMX
ATIK383L+/EFW2/OAG|Lodestar|Baader 36mm LRGBHaSIIOIII
Starlight Express SXVRH16/ONAG/FW|Lodestar X2|Baader 2" Filters
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Lunt LS60PTBF1200|DMK41|Quark Chromo
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Offline Annie

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Re: Focusing on one target.
« Reply #4 on: 12:57:33, 23 November, 2017 »
Thanks Jim, Dave and Chris - plenty to get me going and I may consider the Flame/Horsehead nebula ( as well!)

Chris - I'm marginally embarrassed to say I don't know much about dithering but had assumed it wasn't something I could do with my simple set up - using Backyard EOS?Nikon for acquisition and a stand alone guider?

Annie

Pulsar Observatory; NEQ6/EQ6 wedge; HEQ5 Pro; TS Star 71 Astrograph; Takahashi FSQ 106ed; Skymax 150 Pro; Nikon D600; Canon 550D modified; Canon 5D Mk11; ZWO ASI120 MM-S; Lacerta MGEN stand alone guider.

Offline chris.bailey

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Re: Focusing on one target.
« Reply #5 on: 13:03:57, 23 November, 2017 »
Annie

Remind me which stand alone guider you have. I know the LaCerta can achieve dithering (but not 100% sure how it is done) but don't know about any of the others.

Chris
LX200|ZS70|FSQ85|FLT110|Altair DF250RC|EQ6 Pro(Rowan Belt Mod)|ParamountMX
ATIK383L+/EFW2/OAG|Lodestar|Baader 36mm LRGBHaSIIOIII
Starlight Express SXVRH16/ONAG/FW|Lodestar X2|Baader 2" Filters
Starlight Express SXVRH814/ONAG/FW|LodestarX2|Baader 2" Filters
Lunt LS60PTBF1200|DMK41|Quark Chromo
Samyang 135mm f1.8

Offline Annie

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Re: Focusing on one target.
« Reply #6 on: 13:23:03, 23 November, 2017 »
I have the Lacerta MGEN so will have a look in the very poorly translated from German manual to see if it makes sense!

Annie
Pulsar Observatory; NEQ6/EQ6 wedge; HEQ5 Pro; TS Star 71 Astrograph; Takahashi FSQ 106ed; Skymax 150 Pro; Nikon D600; Canon 550D modified; Canon 5D Mk11; ZWO ASI120 MM-S; Lacerta MGEN stand alone guider.

Offline Annie

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Re: Focusing on one target.
« Reply #7 on: 15:08:17, 23 November, 2017 »
Chris - as far as can tell there's no dithering function described in the Lacerta manual.  There is a binning function if I used a CCD!

Annie
Pulsar Observatory; NEQ6/EQ6 wedge; HEQ5 Pro; TS Star 71 Astrograph; Takahashi FSQ 106ed; Skymax 150 Pro; Nikon D600; Canon 550D modified; Canon 5D Mk11; ZWO ASI120 MM-S; Lacerta MGEN stand alone guider.

Offline chris.bailey

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Re: Focusing on one target.
« Reply #8 on: 15:14:19, 23 November, 2017 »
Annie

Strange as this https://teleskop-austria.at/information/pdf/MGEN_Lacerta_MGEN_Quick_Start_Guide.pdf mentions it but you have to use APT to control it or use the camera port for camera control.

Chris
LX200|ZS70|FSQ85|FLT110|Altair DF250RC|EQ6 Pro(Rowan Belt Mod)|ParamountMX
ATIK383L+/EFW2/OAG|Lodestar|Baader 36mm LRGBHaSIIOIII
Starlight Express SXVRH16/ONAG/FW|Lodestar X2|Baader 2" Filters
Starlight Express SXVRH814/ONAG/FW|LodestarX2|Baader 2" Filters
Lunt LS60PTBF1200|DMK41|Quark Chromo
Samyang 135mm f1.8

Offline Annie

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Re: Focusing on one target.
« Reply #9 on: 15:17:01, 23 November, 2017 »
Have just googled it and some of the posts mention dithering with the Lacerta also so will have a more careful look!  Thanks for the link - will follow that too.

Annie
Pulsar Observatory; NEQ6/EQ6 wedge; HEQ5 Pro; TS Star 71 Astrograph; Takahashi FSQ 106ed; Skymax 150 Pro; Nikon D600; Canon 550D modified; Canon 5D Mk11; ZWO ASI120 MM-S; Lacerta MGEN stand alone guider.

Offline Annie

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Re: Focusing on one target.
« Reply #10 on: 15:29:07, 23 November, 2017 »
Duh - found it! Not sure about using the MGEN camera control unless I can download directly to my PC.  Perhaps it's time to think about another guider and something like PHd2!

Annie
Pulsar Observatory; NEQ6/EQ6 wedge; HEQ5 Pro; TS Star 71 Astrograph; Takahashi FSQ 106ed; Skymax 150 Pro; Nikon D600; Canon 550D modified; Canon 5D Mk11; ZWO ASI120 MM-S; Lacerta MGEN stand alone guider.

Offline chris.bailey

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Re: Focusing on one target.
« Reply #11 on: 15:33:16, 23 November, 2017 »
Annie

You can control the MGen with APT but I think all the camera control does is open the shutter.

Chris
LX200|ZS70|FSQ85|FLT110|Altair DF250RC|EQ6 Pro(Rowan Belt Mod)|ParamountMX
ATIK383L+/EFW2/OAG|Lodestar|Baader 36mm LRGBHaSIIOIII
Starlight Express SXVRH16/ONAG/FW|Lodestar X2|Baader 2" Filters
Starlight Express SXVRH814/ONAG/FW|LodestarX2|Baader 2" Filters
Lunt LS60PTBF1200|DMK41|Quark Chromo
Samyang 135mm f1.8

Offline Annie

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Re: Focusing on one target.
« Reply #12 on: 15:47:26, 23 November, 2017 »
Will have a closer look at APT - I see there's a free trial download anyway.

Annie
Pulsar Observatory; NEQ6/EQ6 wedge; HEQ5 Pro; TS Star 71 Astrograph; Takahashi FSQ 106ed; Skymax 150 Pro; Nikon D600; Canon 550D modified; Canon 5D Mk11; ZWO ASI120 MM-S; Lacerta MGEN stand alone guider.

 

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