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06-02-2016, 07:10 PM - 2 Likes   #1
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DA* 50-135 + Kenko 1.4X TC - an FF beauty on K-1!

Received a Kenko 1.4X AF DG teleconverter today. It is a non-SDM unit and would not auto focus the DA* 50-135 by default. The lens will tell the camera to use SDM motor, even if there is no connection through the SDM contacts.
So I followed Blacknight659's useful post on converting the lens to screwdrive, and it works like a charm with the TC!

Better yet, unlike with the DA 1.4x Rear Converter, this one vignettes much less. The image quality is pretty good too! I'm very happy with this new DA* 70-189mm f/4.

Vignetting tests:

50mm, f/2.8 - Ignore the tree in the corner, it's out of focus, and moving in the wind.


135mm, f/2.8


50mm, f/11


135mm f/11


Feline gauntlet -a bit of processing on these images, but sharpening is the same for each.

135mm, f/2.8, ISO 10000


80mm, f/2.8


80mm, f/4


80mm, f/5.6



Last edited by Mock; 06-02-2016 at 07:18 PM.
06-02-2016, 07:23 PM   #2
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You have a gorgeous cat.
06-02-2016, 07:27 PM   #3
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QuoteOriginally posted by luftfluss Quote
You have a gorgeous cat.
I wanted to do a series at 135mm too, but she had enough of my bounce flash for one day. Went off to nap somewhere more secluded.
06-02-2016, 09:37 PM   #4
Huy
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Thank you very much for sharing. This is a very good news for my DA* 50-135mm.

QuoteOriginally posted by Mock Quote
Better yet, unlike with the DA 1.4x Rear Converter, this one vignettes much less.
How much more vignetting is the combo DA* 50-135mm + Pentax 1.4x rear converter?

06-02-2016, 09:46 PM   #5
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QuoteOriginally posted by Huy Quote
Thank you very much for sharing. This is a very good news for my DA* 50-135mm.



How much more vignetting is the combo DA* 50-135mm + Pentax 1.4x rear converter?
They're not my images to share, but a little bit worse for vignetting, especially at 135mm which looks nearly the same as using the lens in FF mode at 135mm without TC. The extreme corners were also soup in terms of resolution, both at 50 and 135mm.
Remember that the Pentax unit is designated DA, and it shows, which is unfortunate because I'd rather have a weather-sealed converter to match the lens.

The samples here don't give a good example of corner resolution, but this TC does a much better job.
08-01-2016, 06:33 PM   #6
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I own that TC, its pretty good and value too.Turns my 135-400mm to 189-560mm and the plastic fantastic 50 to 70mm F2.5.
08-01-2016, 07:33 PM   #7
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For shots with the subject in the centre and darkness in the peripheries, it looks like you're on a winner.

I'll stick to using it on a crop body. In that environment it really is a beauty
08-03-2016, 08:09 PM   #8
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55/300 with Vivitar 1.4x TC...crop mode @300mm

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Last edited by surfar; 08-03-2016 at 08:14 PM.
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