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07-22-2013, 09:41 PM   #16
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QuoteOriginally posted by bossa Quote
Perhaps Pentax can release one of these to convert Pentax FF lenses to function at their intended FOV on their own APS-C cameras. People might be less interested in a Pentax FF for the moment if that were the case.
That would be awesome. They could even design one that uses a shorter registration distance (As sony E mount for example) and place the reducer "inside" the mirror box in a camera like the succesor of the K-01.

For DSLRs, an autofocus (or not) reducer with electronic contacts would rock...

07-23-2013, 07:36 PM   #17
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I had to do a bit of research and am scratching my head as to what this post has to do with Pentax lenses. Near as I can tell, this is an adapter for the Sony NEX APS-C cameras that reduces the image circle of lenses originally designed for 35mm film to be appropriate for APS-C. There are versions to adapt multiple mounts including Pentax-K. As with most adapters with optical correction, there is a significant loss of resolution.

Edit: When I wrote this comment, this thread was in the Pentax Lens section. The mods have since moved it to the non-Pentax camera section where it will likely get more traction.


Steve

Last edited by stevebrot; 07-24-2013 at 06:49 AM.
07-23-2013, 08:11 PM   #18
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QuoteOriginally posted by stevebrot Quote
I had to do a bit of research and am scratching my head as to what this post has to do with Pentax lenses. Near as I can tell, this is an adapter for the Sony NEX APS-C cameras that reduces the image circle of lenses originally designed for 35mm film to be appropriate for APS-C. There are versions to adapt multiple mounts including Pentax-K. As with most adapters with optical correction, there is a significant loss of resolution.


Steve
The claim says that lenses actually can appear sharper. This is true for the metabones adapters and debatable for the lens turbo. There is some softening at the edges, especially with the lens turbo.
07-24-2013, 02:53 AM   #19
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QuoteOriginally posted by stevebrot Quote
As with most adapters with optical correction, there is a significant loss of resolution.
Not necessarily (depending on the product). The Metabones Speed Booster seems OK, according to Roger Cicala:

QuoteQuote:
The Metabones Speed Booster does what they claimed it would do, much to my shock and surprise. It creates a wider-angle, greater aperture lens while retaining resolution and acutance.
LensRentals.com - Metabones Magic?

07-24-2013, 07:15 AM   #20
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QuoteOriginally posted by rawr Quote
Not necessarily (depending on the product). The Metabones Speed Booster seems OK, according to Roger Cicala:
I guess if I were a NEX shooter contemplating a device of this type, I would go with the Metabones I read Cicala's full review as well as the long string of comments and his replies. It appears that his is a qualified "thumbs up". I was surprised at the resolution numbers, not surprised at the apparent reduction of CA (it is still there, but simply less apparent due to negative magnification), and not surprised by the introduction of astigmatism and barrel distortion.

In regards to carrrlangas' comment above regarding the notion of a K-01 variant with a built in converter...What an interesting concept. Or how about a Ricoh GXR mount unit with similar capability?


Steve

P.S. I just looked up the price for the Metabones unit...OUCH!!!
07-24-2013, 07:57 AM   #21
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QuoteOriginally posted by stevebrot Quote
P.S. I just looked up the price for the Metabones unit...OUCH!!!
If I ever went down this path I'd probably just get the cheaper Lens Turbo. It seems OK enough, judging from everyones samples, and I'd only use such an adapter for fun anyhow.
07-24-2013, 08:04 AM   #22
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I'm thinking strongly of going down this path, and I don't see a Metabones PK>NEX adapter on their website, so it looks like my choice is made for me.

08-13-2013, 07:44 AM   #23
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My lens turbo with K-mount just arrives yesterday. Here are few quick snaps with NEX 5N and Sigma Super-Wide 24mm f/2.8 shooting wide open in f/2.8.

The return of the full frame field of view is very welcome but at the same time it will take some time for me to get used to original FOV. All in a sudden, my 24mm is too wide. I think it is a good thing, don't you think?



Sigma Super-Wide 24mm f/2.8 on top of Lens Turbo for Pentax k-mount



1/125 sec, iso 400, -1 Ev, f/2.8, hand-held



1/15 sec, iso 800, -1 Ev, f/2.8, hand-held



1/10 sec, iso 800, -1 Ev, f/2.8, hand-held, likely lens flare with some ghosting in the image



f/2.8, some post processing for minor contrast adjustment


Please excuse the poor subjects of testing as I took a night walk and that was the usual time that I have for photography. More pictures will be placed in this flickr set with Lens Turbo.

Cheers,
Hin

Last edited by hinman; 08-13-2013 at 11:39 AM.
08-22-2013, 01:30 AM   #24
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Pentax A50 f1.7 on the Lens Turbo

Taken at f4:


Similar shot taken on the Summicron 50 at f2:


08-22-2013, 05:09 AM   #25
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That last shot looks a bit bokeh crazy but very interesting.
The same combo doing something like street lights or busy traffic at night would be pretty wild.
08-23-2013, 01:21 AM - 1 Like   #26
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Here's a night shot illustrating the bokeh.


This is a daytime picture:


And the same subject at night:
08-23-2013, 05:53 AM   #27
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Cool. Looks like you've been having a lot of fun with that kit.
08-23-2013, 03:33 PM   #28
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QuoteOriginally posted by bossa Quote
Perhaps Pentax can release one of these to convert Pentax FF lenses to function at their intended FOV on their own APS-C cameras. People might be less interested in a Pentax FF for the moment if that were the case.
It'll be extremely awesome if it's a built-in feature of a K-02
In the mean time, a NEX 3n and this lens turbo are really tempting me. Metabones don't have any for Pentax mount. Otherwise I'd probably bite the bullet and go NEX.

QuoteOriginally posted by kenafein Quote
There is some softening at the edges, especially with the lens turbo.
Barrel distortion and corner softness are quite obvious in many shots too. Come on Metabones, throw us Pentaxians some of that in your name!
08-23-2013, 08:04 PM   #29
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I think now's the best moment to get a 3n, it just 329 in adorama with the kit lens!
08-23-2013, 11:50 PM   #30
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I don't see that deal at Adorama. Just $299 for body only. Which is also pretty good.
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