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Table 2

Observations log.

Name Obs. date Exp. time (s) FWHM (′′)
(dd.mm.yyyy) g i g i

NGC 2271 01.02.2012 9 × 419 9 × 315 0.73 0.74
NGC 2865 25.01.2012 6 × 480 6 × 340 0.63 0.50
26.01.2012 6 × 490 6 × 350
NGC 3962 22.02.2012 6 × 610 6 × 440 0.73 0.60
NGC 4240 02.02.2012 5 × 422 5 × 275 0.80 0.58
IC 4889 17.04.2012 3 × 575 5 × 355 0.75
01.05.2012 3 × 575 1 × 355 0.49

Notes. The FWHM was measured on the combined images.

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