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05-08-2018, 08:08 AM - 3 Likes   #1
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First tests with the Vivitar 120-600mm F5.6-F8

Over the weekend I started playing with my "new" Vivitar 120-600mm F5.6-F8.

Conditions were windy and I don't have a tripod made especially for heavy lenses (Sirui T-025X) so results might not be as good as I'd wish. Still, the lens delivers pretty good results.

Since I already have a Pentax 60-250 F4 (a vastly superior lens) my main interest is at the tele end, near 600mm. I mostly tested there.

First comment, purple fringing is strong with this lens, as is to be expected. Luckily, it's also easy to correct via post-processing.

Second, the focus ring is superb, very smooth, easy to operate and precise.

Third, using ES and 10 second timer help to prevent vibrations, but I'm not convinced that it wouldn't be better to use SR instead. I'll have to try.

It's possible to click images to see full-res versions.

My first pair of samples shows the same image, the first being a JPEG straight out of camera, the second the same with PF removed, some clarity and vibrance added. Image shot at F8. Subject about 15 feet from camera (near the closest focus distance).

Unmodified



Modified


The second series looks to see if there's a significant drop in resolution as we zoom in, going from 250, to roughly 400, to 600. All at F8. Subject about 25 feet from camera. All images cropped to 100% magnification, which explains the different FOV.

250mm


400mm


600


The third compares (different composition, same distance) the same subject at F8 and F16. Subject about 30 feet from camera.

F8


F16


The last shows the detail that's possible to capture with a distant subject (about 200 feet, roughly). Shot at F8, and cropped to 100%.



05-09-2018, 02:13 PM   #2
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Bernard have you got the labels the wrong way round for those first 2 shots? - I'm wondering if this is also the same as the Koboron 120-600?
05-10-2018, 05:30 AM - 1 Like   #3
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QuoteOriginally posted by rjbrett Quote
Bernard have you got the labels the wrong way round for those first 2 shots?
I don't think so. By "modified" I mean that I used Lightroom to remove some PF, by clicking on the purple fringe. I could have tried a more advanced editing by trying to remove all CA (there is a green fringe visible) but that wasn't the point here. I also added some clarity.

QuoteOriginally posted by rjbrett Quote
I'm wondering if this is also the same as the Koboron 120-600?
It's supposed to have been made by Kobori, so without knowing anything about the lens you mention, I'd guess yes
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