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Vivitar 28-90 macro only for short distance?
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PostPosted: Sun Apr 23, 2017 2:01 am    Post subject: Vivitar 28-90 macro only for short distance? Reply with quote
I tried this lense with an adapter on my A6000 and the picture was much out of focus when I tried it for a distance on several miles. Is this lens constructed only for short focus?


PostPosted: Sun Apr 23, 2017 2:58 am    Post subject: Reply with quote
Of course not. The Vivitar Series 1 28-90 is an excellent vari-focal zoom. You =do= have to refocus whenever you zoom with this lens, but when set to infinity, distant subjects should be in focus. If this isn't the case, I would first suspect the adapter you bought.

I have bought at least one Chinese adapter that doesn't focus at infinity. So it can happen.


PostPosted: Sun Apr 23, 2017 4:22 am    Post subject: Reply with quote
My lens has an Olympus mount and when I try it on a manual Olympus camera on a distance between 6 and 7 meters, the lens ruler shows between 10 meter and infinity, and that´s the same as on my digital camera, so I believe it must be something wrong with the lens.

Are there anything I can do with this? Is it possible that the lens has been opened and assembled in a wrong way?


PostPosted: Sun Apr 23, 2017 4:24 am    Post subject: Reply with quote
Sounds like your adapter is too thick, or the lens was worked on by someone that didn't know what there doing.


PostPosted: Sun Apr 23, 2017 7:10 am    Post subject: Reply with quote
Quote:
My lens has an Olympus mount and when I try it on a manual Olympus camera on a distance between 6 and 7 meters, the lens ruler shows between 10 meter and infinity, and that´s the same as on my digital camera, so I believe it must be something wrong with the lens.

It looks as if "infinity" is not well calibrated, thus a problem of the lens, not the adapter!
I have had similar problems with many of my Konica Hexanon zooms, but not with other manufacturers (Minolta, Canon, Nikon, ...).

Quote:

Are there anything I can do with this? Is it possible that the lens has been opened and assembled in a wrong way?

Difficult to say. The 28-90 seems to be a two group zoom, and the interaction of the two groups while focusing may be quite complicated (unlike a four group zoom where only the front group is responsible for focusing). If you'd find any information about servicing the lens, one might give it a try, but otherwise it looks a bit difficult.

Stephan
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