Here you can see a pair of interacting galaxies which are extremely small and faint. Each galaxy measures about 4/5 arcsecond, while the faint star just north of the left one (eastern) is about 10 arcsecond away. This is entry 0783-0267419 in USNO-B1.0 catalogue and data for its magnitude are: B1mag = 20.46 B2mag = 20.16
For my picture's data see here. All pictures are kept in their original size.

Below you can see a crop of my picture taken with a 0.356-meter (14 inch) telescope, showing the twin spiral galaxies as faint fuzzies.
This is a crop from a chemical photograph taken with the KPNO 4-meter (158 inch) Mayall telescope, in 1974.
Below you can see the same galaxies from 8-meter (316 inch) VLT ANTU with FORS1 on January 30, 2000.
Credit: ESO
The same galaxies from Hubble Space Telescope and ACS.
Credit: NASA and The Hubble Heritage Team (STScI/AURA)