Late at night with an old lens

 The Vivitar Series 1 135mm f/2.3 lens was introduced in the late seventies and was a well-regarded "third-party" lens.  The copy that I have was bought used and was manufactured in either 1978 or 1988, based on the serial number.  My best guess is that 1988 is the likely date, so 37 years old.  I coupled the lens with a Metabones Speedbooster, which converts the lens to 95 mm f/1.6.  

When used wide open this lens exhibits significant purple-fringing (longitudinal chromatic aberration) and some astigmatism in the corners.  Lens manufacturers of this era did not have available many of the exotic low-dispersion and high-index-of-refraction glass types that seem ubiquitous today.

The Pleiades rising over Snowshoe Mountain.

 

The Andromeda Galaxy (M31).

Mizar and Alcor (center left) descending toward Bristol Head.

Mizar and Alcor are the two components of a naked-eye double star in the handle of the Big Dipper.  

The Galactic Core setting behind the Bristol Head ridgeline.