For example, I recall Denis saying it had virtually none but Pinac says otherwise.
So my question is what level of CA does this binocular exhibit? Any other observations as to its optical quality?
As with all binoculars there is bound to be sample variations.
I purchased my first Pentax 20x60 PCF WP II over 15 years ago.
I admit to not using it like I use to, when it was brand new & I was a newbie.
I also have another Pentax 20x60 PCF WP, older model version & optical coatings.
I used them mainly for daytime bird watching, airplanes, etc.
I do not recall that CA ever was a problem with either Pentax 20x60 models.
Some minor ghosting was more apparent with the older models & older coatings,
when viewing a full moon.
Two or three reasons that I have not used them in later years.
As I got older I got lazier, not wanting to bother with a monopod or tripods.
Also, I felt that my Tento 20x60 was sharper than the Pentax 20x60's,
although the Pentax 20x's were in no way lacking in resolution, & the magnification
of the Tento was slightly more than the Pentax's rated 19x.
Finally, I no longer travel like I use to for the express purpose of bird watching.
Perhaps my eyes are not as sensitive as other individuals to CA.
The best way to test them for CA is on the full moon.
Over the years internet advertisement/reviews suggested that Ricoh has further improved the optical coatings of the Pentax SP WP binoculars.
So, if anything, the newer models of the Pentax SP WP 20x60 should be better than ever.
IPD adjustment & eyecup settings were something that EdZ pointed out, in his
review of my Pentax 20x60 PCF WP II, as being critical to my particular sample.
I always preferred the smaller, lighter size of the 60mm over the 80mm or 90mm models, although the 20x90mm is quite a light bucket for stargazing.
Edited by hallelujah, 04 June 2020 - 08:57 AM.