Leo area with Samyang 135ED f/2.0 (Göran Nilsson)

Celestial hemisphere: Northern · Constellation: Leo (Leo) · Contains: 12.67 · 13.49 · 140 Siwa · 70 tet Leo · 73 n Leo · 752 Sulamitis · 77 sig Leo · 78 iot Leo · 85 Leo · 88 Leo · Chertan · Chort (θLeo) · IC 2628 · IC 2634 · IC 2637 · IC 2638 · IC 2645 · IC 2648 · IC 2649 · IC 2661 · IC 2666 · IC 2674 · IC 2681 · IC 2684 · IC 2694 · IC 2704 · IC 2708 · IC 2745 · IC 2749 · IC 2752 · And 65 more.

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Leo area with Samyang 135ED f/2.0

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Leo area with Samyang 135ED f/2.0

I was shooting away on the Leo Triplet with my ES 5" apo last night (first time in a month for the usual reason) when I decided to test the Samyang 135ED f/2 that I recently bought. I used it side by side with the scope. It could possibly be better focused (but I do not know). I set the ISO to 1600 (should work as it was around 0°C outside), full aperture (f/2.0) and 1 min exposures.

I had not much hope for this long shot, particularly since clouds started moving in. I probably shot about 60 exposures and surprisingly 28 of these were unaffected by clouds. So I got totally 28 min of data.

No sharpening or noise reduction applied - just curves and GradientXterminator in PS CS5.

I have to say that this is an amazing lens - even at full aperture there is almost no tendency for odd star shapes. Of course, this was done with an APS-C camera, and I do not know what the corners would look like with a full frame DSLR.

In 35 of the frames I caught a slow moving object transversing the image from top to bottom in 35 min, possibly the ISS. It can be seen as a very faint line in this image.

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Status	Advanced success
Started	...
Astrometry.net job	1505230
PixInsight job	6PYEZ8TCZ6XKPYKLAGXCRBF0I4I5KSHR
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	11h19m53s.60
RA (top/left)	11h06m04s.26
RA (top/right)	11h06m51s.81
RA (bottom/right)	11h33m16s.60
RA (bottom/left)	11h33m22s.53

Dec (center)	+10°57′28″.2
Dec (top/left)	+15°50′22″.6
Dec (top/right)	+05°58′38″.5
Dec (bottom/right)	+06°02′05″.7
Dec (bottom/left)	+15°53′54″.3

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Leo area with Samyang 135ED f/2.0

Leo area with Samyang 135ED f/2.0

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Leo area with Samyang 135ED f/2.0

Leo area with Samyang 135ED f/2.0

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