Comet 2014 N3 NEOWISE is a very distant comet that remained around magnitude 15 for much of 2014 and 2015 despite being more than 3 AU from both the Earth and the Sun.
Comet 2014 A4 SONEAR. 12 August, 2015. Combination of 5, 3 minute images unfiltered. SBIG ST9XE CCD. 12" f/10 schmidt-cassegrain with an f/6.3 focal reducer.