Are Zooms of today "better" made than a zoom made circa 1975.?
In my opinion, the biggest jump in Zoom quality occurred once it became economically feasible to apply multicoating to all of the lens elements. This not only increased transmission significantly, but gave lens designers the freedom to use additional elements where needed. Zoom quality continued to improve as ED glass and aspheric elements became more affordable as well. By 1975, there were a few quality zooms such as the Nikon 80-200mm f/4.5 and the previously mentioned Vivitar/Kiron 70-210mm f/3.5, but it really took another five years or so before they were generally accepted for professional use.
Nikon's 43-86mm lenses are an example of this. The original version used 9 elements in 7 groups, but in 1975 Nikon redesigned it to use 11 elements in 8 groups. I own one of the latter lenses for which I paid $22 -- it's reasonably sharp at f/5.6, but it still suffers from excess distortion.
Do you guys use a Zoom very often with your Film SLR.? Thank You
I use quite a few zooms with my film SLR's. In the last year, I've used.
Pentax 110 -- 20-40mm f/2.8 (But just once).
Nikon Pronea S -- 30-60mm f/3.5~5.6, 60-180mm f/4.5~5.6
Nikon FA -- 35-105mm f/3.5~4.5, 80-200mm f/4
Nikon F100 -- 17-35mm f/2.8, 28-70mm f/2.6~2.8, 75-150mm f/3.5, 70-200mm f/2.8
Pentax 645n -- 45-85mm f/4.5, 80-160mm f/4.5