Someone else can do MTF tests and the like - I am happy with considered observation of more typical photos. I should stress that these are not scientific tests, but neither are they random snapshots. What follows are some images taken with the M01.
From its serial number it was made by Tokina. My copy is in excellent condition but did not come with a front cap. The aperture ring has 12 click stops from f/16 to f/1.9 (there is no half-way click between 16 and 11). I consider this a must for all of these lenses, since the front elements are not recessed and are quite susceptible to glare. I fitted it with a generic metal wide-angle hood. It is quite hefty at 334g and 62 mm in length.
Like the other Vivitars, and unusual for its time, it is close focusing - I measure about 25cm or 10". Adjusting the filter rotation after focusing would not bother me in this application. This might be a nuisance for polarising filter use, though I would be set up on a tripod for landscape shots where I'd be likely to need a PF. However I should note that the front element does rotate. This means the lens does not change size when focusing. It is an excellent optical design, utilising floating elements to provide internal focusing. It comes up for sale rarely but fetches between $150 and $200 when it does. To this I can add the fact that it cost $305 back in 1978, quite a fortune in today's money. Highly sought after, it is a hard lens to find." He writes: "A very fast wideangle lens, especially for its day (1970's), of excellent quality. Over at Denis' Photography Pages the author has a page dedicated to Vivitar Lenses. This lens is from the seventies and has the M42 screw mount, so you'll want to read Using A Manual Lens On A Pentax Digital SLR. This is the only lens in the test to bear the famed "Series 1" label. Here's the first of these, the Vivitar Series 1 Auto Wide Angle 28mm f/1.9 (designated M01 in my numbering scheme). In the first article in this series, Looking For The Perfect Normal, I outlined the goals of the search and described the five lenses I'll be examining.
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