This thread has had me really interested in joining in on the topic, especially with most of my observing being done from a light polluted balcony, and a new UHC filter on it's way (Baader Neodymium). I've been using the NASA/IPAC Extragalactic Database to get some idea if any of the galaxies on my list might have stronger emission lines in the regions favored by what filters I have. Especially, in the hopes of seeing more spiral structure. Trying to bank on the hope that spiral arms often have more star formation going on, and therefore might behave more like nebulae. Tonight was a pretty decent night, so, I went after some of the aforementioned galaxies to see how they did. Here's my report:
Equipment used: Skywatcher 250p Classic Dob. Explore Scientific 82deg eyepieces: 8.5mm, 14mm, and the ES68 24mm. Svbony UHC filter, and Orion Ultrablock.
Conditions: Bortle 6, NELM: 4.5, TLM: 11.8. Seeing: 2.5/5.
NGC 3310: 21:48hrs, Directly visible in 24mm as moderately bright round disk brighter towards center, averted vision shows another dimmer halo around that. Same in 14mm and 8.5mm, however 8.5 would show a slight hook to one side of central disk in moments of good seeing.
8.5 w/ UHC: Brighter Nucleus, outer disk appears uneven and mottled in averted vision, hook to central disk more apparent
8.5 w/ Ultrablock: dimmer overall, however, may appear slightly elongated, hard to tell with wind.
NGC 4111: 22:25hrs. Bright stellar core that "blinks" when looking directly at it. Core surrounded by faint, thin ellipse, core offset to south of this oval region. 8.5mm shows this central oval region best.
8.5 w/ UHC: slight increase in contrast of core region, stellar core is steady.
8.5 w/ Ultrablock: Significantly dimmer, still visible with averted region: central oval much smaller.
NGC 4244: 22:43hrs. Undetectable in 24mm, in 14mm averted vision reveals thin line of mottled light. 8.5mm still visible only in averted vision, center of thin section shows slight bulge. All filters at all magnifications render target undetectable.
M66 and M65: (forgot to log time): easily seen in 24mm, bright cores surrounded by fuzzy patches, thinner for M65, more round for M66. with UHC filter both central regions easier to see, more so on M66, extra "bump" visible in averted vision with filter on 8.5mm. M65 seen as long, thin, ellipse.
That's as far as I got before conditions started to go downhill pretty fast. Just enough to get me curious about using filters more from home.