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$199 focal reducer speed booster adapter Pentax PK K to Sony NEX
Posted By: jogiba, 05-08-2013, 05:10 PM

QuoteQuote:
Focal reducer/Speed booster adapter

for/Pentax PK K bayonet lens to Sony NEX mount 5 6 7 camera FS700 FS100

All metal structure, with excellent opticals (4 elements/2 groups, super multi-coated)
what it does:


reduce the focal length (by 0.72x wider)


Ex. 50mm lens on NEX with the adpater, eff. focal length is 50mm x 1.5(crop) x 0.72 = 54mm

 

effectively increases the maximum aperture of the lens by 1 stop




(in other words, under the same aperture, you can use faster shutter speed (by 1 stop).

  what it does not:
there is no electronic integration, no auto fucusing

(you still need to manually focus your lens and aperture, etc.)
Focal Reducer Speed Booster Adapter Pentax PK K to Sony NEX 3 5 6 7 FS700 FS100 | eBay




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05-08-2013, 06:55 PM   #2
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No brand name? How can I trust the optical quality?
05-08-2013, 07:17 PM   #3
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Someone needs to buy it and try it!
05-08-2013, 09:55 PM   #4
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I believe these are the Zong Yi Lens Turbos. I've seen links to the auctions on SonyAlphaRumors. It is strange that they are not labeled at all. Zong Yi makes the Mitakon 35/0.95 lens, which has passable optics from samples, but not great. Kind of good for the price. I'm looking forward to some reviews. Metabones doesn't seem to have K mount on their radar at all.

Edit: Come to think of it. I saw some images, I think Jogiba posted those too, of Zong Yi focal reducers with bold red lettering.

05-09-2013, 04:58 AM   #5
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QuoteOriginally posted by kenafein Quote
I believe these are the Zong Yi Lens Turbos. I've seen links to the auctions on SonyAlphaRumors. It is strange that they are not labeled at all. Zong Yi makes the Mitakon 35/0.95 lens, which has passable optics from samples, but not great. Kind of good for the price. I'm looking forward to some reviews. Metabones doesn't seem to have K mount on their radar at all.

Edit: Come to think of it. I saw some images, I think Jogiba posted those too, of Zong Yi focal reducers with bold red lettering.
Here:
https://www.pentaxforums.com/forums/non-pentax-cameras-canon-nikon-etc/211879...ml#post2358805
05-09-2013, 06:41 AM   #6
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So these don't look like the Zhong Yi adapters. Is this another player?
05-09-2013, 02:01 PM   #7
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Someone on the DPR NEX forum said they sell them in China for $110 and there was a Camera Show Expo were they were on special for 30% off or about $77 so maybe prices will fall when more are in production.
05-09-2013, 04:45 PM - 1 Like   #8
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So... who is going to be the first brave soul to take apart a K-01 and stuff one of these behind the lensmount? Hmmm?

(If you do it carefully, only putting the optic group *inside* the K-01, it could retain AF, etc.)

05-09-2013, 06:01 PM   #9
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QuoteOriginally posted by panoguy Quote
So... who is going to be the first brave soul to take apart a K-01 and stuff one of these behind the lensmount? Hmmm?

(If you do it carefully, only putting the optic group *inside* the K-01, it could retain AF, etc.)
I sure would give it a go if i could get my hands a K-01! LoL!

But anyway, give it some time.. Anything made in China will definitely hold promise of 1,001 other companies doing it once they realize that it sells, therefore driving the price down like nuts.

Copyrights don't seem to apply in there and so long as there's money to be made, there are definitely other sellers/manufacturers over there..
05-09-2013, 06:39 PM   #10
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i wonder what the total NEX registration distance + thickness of this adapter is ? if it's close to 50mm, then potentially there would be enough space to just mount this thing on like any adapter!
05-12-2013, 06:07 PM   #11
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http://mxcamera.com/mitakon/en/index.html

Mitakon “Lens Turbo” in Stock and for sale on eBay. | sonyalpharumors



05-12-2013, 07:49 PM   #12
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Not that you need it, but are you buying one? I'd be interested in a quality analysis.
05-13-2013, 07:09 AM   #13
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Excellent! 18mm + 30mm = 48mm - 45.5mm = 2.5mm, so flanged adapter is possible to fit inside the spacious K-01 "mirror" box .. assuming the optical group diameter fits (which it should)
05-13-2013, 09:28 AM   #14
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QuoteOriginally posted by digital029art Quote
Excellent! 18mm + 30mm = 48mm - 45.5mm = 2.5mm, so flanged adapter is possible to fit inside the spacious K-01 "mirror" box .. assuming the optical group diameter fits (which it should)
So this adapter is for Pentax or Nex camera?
05-13-2013, 09:42 AM   #15
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QuoteOriginally posted by vodanh1982 Quote
So this adapter is for Pentax or Nex camera?
It allows you to use your Pentax lenses on a NEX camera; no autofocus, and you'll want to shoot lenses with an aperture ring.
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