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Large Magellanic Cloud through Canon Nifty Fifty Mk I

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#1 BQ Octantis

BQ Octantis

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Posted 11 December 2018 - 08:34 AM

G'day all,

 

I was out shooting the comet last night on my EQ2—so out in the middle of my yard with a good view of the LMC. After plenty of exposures on the comet through the 200mm, I couldn't help but shoot the LMC. I gave it another go through the 50mm (which I did at the beginning of the year)—but this time with the autoguider hack. Since last year, I also now have a library of darks (recently at high temperatures—it's been bloody HOT!). I also snapped some flats for the 50mm. Here's the outcome:

 

Large Magellanic Cloud

Large Magellanic Cloud, 2018-12-10
Canon 50mm f/1.8 Mk1@f/2.8, Canon T3i
29×30sec@ISO800, 20×darks, 20×flats
EQ2 mount w/hacked controller
Orion Magnificent Mini Deluxe autoguider
Aligned and stacked in Lynkeos 2.10
Processed in Photoshop CS5 w/Astronomy Tools v1.6
Scaled to 50% full sensor, cropped to 1440x960
Tropic of Capricorn, NT Australia

 

Cheers,

BQ


Edited by BQ Octantis, 12 December 2018 - 12:04 AM.

  • nofxrx, Starman27, okiestarman56 and 11 others like this

#2 SandyHouTex

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Posted 11 December 2018 - 11:14 AM

G'day all,

 

I was out shooting the comet last night on my EQ2—so out in the middle of my yard with a good view of the LMC. After plenty of exposures on the comet through the 200mm, I couldn't help but shoot the LMC. I gave it another go through the 50mm (which I did at the beginning of the year)—but this time with the autoguider hack. Since last year, I also now have a library of darks (recently at high temperatures—it's been bloody HOT!). I also snapped some flats for the 50mm. Here's the outcome:

 

 

Large Magellanic Cloud, 2018-12-10
Canon 200mm f/2.8L@f/2.8, Canon T3i
29×30sec@ISO800, 20×darks, 20×flats
EQ2 mount w/hacked controller
Orion Magnificent Mini Deluxe autoguider
Aligned and stacked in Lynkeos 2.10
Processed in Photoshop CS5 w/Astronomy Tools v1.6
Scaled to 50% full sensor, cropped to 1440x960
Tropic of Capricorn, NT Australia

 

Cheers,

BQ

Awesome pic!



#3 BQ Octantis

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Posted 11 December 2018 - 04:09 PM

Awesome pic!

Thanks, mate! And thanks to all for the likes.

 

BQ



#4 Samir Kharusi

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Posted 12 December 2018 - 02:17 AM

Awesome! I never realised that it was that huge. So I checked out The Sky and the 50mm FoV just to confirm there was no typo. Well done! Who needs a telescope...



#5 einarin

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Posted 12 December 2018 - 02:26 AM

Nice pic.

Someday(night) I'm going south enough to see & image this.



#6 BQ Octantis

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Posted 12 December 2018 - 02:38 AM

Awesome! I never realised that it was that huge. So I checked out The Sky and the 50mm FoV just to confirm there was no typo. Well done! Who needs a telescope...

Thanks, mate! The LMC is what makes me want to upgrade my Nifty Fifty to perhaps an 85mm f/1.4. But there aren't many other targets that big—except maybe a comet…

 

BQ



#7 Samir Kharusi

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Posted 12 December 2018 - 03:00 AM

Thanks, mate! The LMC is what makes me want to upgrade my Nifty Fifty to perhaps an 85mm f/1.4. But there aren't many other targets that big—except maybe a comet…

 

BQ

Just a word of warning against buying fast, short, Canon lenses. I bought the pair 50mm/1.8 & 50mm/1.4 and the pair 28mm/2.8 & 28mm/1.8. In both pairs the slow and the fast lenses needed to be closed down to the same f-stop for astro. I won't be surprised to find similar behavior for the 85mm/1.4 & 85mm/1.8 but the 1.4 costs 5x as much. Canon MTF curves:

f1.8 ef_85_18mtf.gif    f1.4 ef_85_14_usm_mtf.jpg   f1.2 tele_ef85mm.jpg

 

All 3 need serious closing down (to f2.8/3.5? for an APS-C crop DSLR) to get all the curves above 0.7. In my experience once the MTF are above 0.7 your stars will be satisfactory-enough on any size print. Just a warning ...



#8 BQ Octantis

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Posted 12 December 2018 - 04:44 AM

Just a word of warning against buying fast, short, Canon lenses. I bought the pair 50mm/1.8 & 50mm/1.4 and the pair 28mm/2.8 & 28mm/1.8. In both pairs the slow and the fast lenses needed to be closed down to the same f-stop for astro. I won't be surprised to find similar behavior for the 85mm/1.4 & 85mm/1.8 but the 1.4 costs 5x as much. Canon MTF curves:

f1.8 ef_85_18mtf.gif    f1.4 ef_85_14_usm_mtf.jpg   f1.2 tele_ef85mm.jpg

 

All 3 need serious closing down (to f2.8/3.5? for an APS-C crop DSLR) to get all the curves above 0.7. In my experience once the MTF are above 0.7 your stars will be satisfactory-enough on any size print. Just a warning ...

 

The Nifty Fifty has bad edge coma and CA wide open (f/1.8), but the live view f-stop preview showed a major improvement at f/2.8. Since the 200 does well at f/2.8 (not to mention my several workflows for that f-stop), I went with it. Since this shot was a significant crop (a landscape crop from a portrait shot), there was no coma to speak of in the final.

 

BQ




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