Never looked at it with smaller than 12.5-inch but with this aperture all members were visible.

The 16-inch shows the quartet with all its beauty and all the different elongations.

sketch: 16", 515x, NELM 6m0+
HCG61.jpg
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The 27-inch shows "c" (4175) with a stellar peak at the NW tip, "b" (4173) is clearly S-twisted with a longish offset nucleus but without the dark lane.

[Hickson observing project to HCG 61]