Hello Gary:

I’ve experience only with an older PCF from the period you describe. FWIW, a couple of years ago, I did some daytime “resolution testing” with 100 ft, 8-18 arcsecond “homemade” USAF style elements drafted in Autocad. Excerpts from posted results, FWIW:

“A center target was installed, followed by adjoining targets at angular separations of 1.0, 1.5, 2.0, 2.5, and 3.0 degrees from center. Bins were tripod mounted. Results are in arcseconds apparent resolution (Observed resolution x listed magnification of bins).

Pentax 7x50 PCF, 7-degree FOV (Circa early 1990's)- Center, 1.0, 1.5, 2.0, 2.5, 3.0 degrees out: 91, 91, 91, 98, 126, Off-Scale

Swift Model 761 8x42 Ultralights, 5-Degree FOV - Center, 1.0, 1.5, 2.0 degrees out: 96, 96, 104, 116

G.O. 10.5x70 Signatures, 5-Degree FOV - Center, 1.0, 1.5, 2.0 degrees out: 94.5, 105, 115.5, 136.5”

Don’t know what particular PCF model I have; the photo may help. This bin is one of four in our house. I’m no bin expert, but the views are sharp.