Tag: MaxField coma corrector

M2 Globular Cluster

Messier 2 is a globular cluster located in constellation Aquarius and it’s approximately 37’000 light-year away from Earth. It’s one of the biggest known globular cluster, because it contains approximately 150 000 stars and it has 175 light-years in diameter. After Crab Nebula M1, this cluster is the second object of Messier’s catalogue of deep space objects.

This picture was the second captured object (after M71) during one night and it’s an integration of 3 hours of exposure.

Technical details:

TelescopeNewton 254/1000 mm
Aperture254 mm
Focal length950 mm
MountGemini G53f
AutoguidingZWO 174MM, TS 60/240 mm
CameraZWO 071 Pro @-15C
CorrectorTS-Optics 2" 3-element MaxField
FiltersHutech IDAS LPS-D2
Exposure60x180s, Gain 94, bin 1x1,
Date2018-10-04

M71 Globular cluster

Messier 71 is a globular cluster located in constellation Sagitta. The cluster is located approximately 12 – 13 thousand light-years from earth. The classification of M71 as a globular cluster was questionable for a long time, because it lacks central star concentration and therefore it was considered as an open cluster. The diameter of this cluster is only 27 light-years, which is very low value for globular cluster.

Well I am back in light pollute sub-urban area. I can use bigger and heavier telescope, but I am missing dark skies of Milos. The picture is an integration of 38 pictures, with exposure time 3 minutes. Total exposure time was approximately 2 hours.

I managed to test new TS-Optics 2″ 3-element MaxField Newtonian Coma Corrector, which should be 2” version of Wynne corrector. It should have significant advantage compared all 2” coma correctors on the market: it reduces focal length by 5%, should correct full frame CCD (we will see about that) and it should have very low vignetting. I will have to extend my World Wide Coma Correction exercise.

Technical details:

TelescopeNewton 254/1000 mm
Aperture254 mm
Focal length950 mm
MountGemini G53f
AutoguidingZWO 174MM, TS 60/240 mm
CameraZWO 071 Pro @-15C
CorrectorTS-Optics 2" 3-element MaxField
FiltersHutech IDAS LPS-D2
Exposure38x180s, Gain 94, bin 1x1,
Date2018-10-04