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09-04-2011, 05:04 AM   #1
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Pentax Q - K-mount adapter !

Looks interesting.



09-04-2011, 05:20 AM   #2
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That's awesome, esp given the 5.67 crop factor of the Q.

Now I can turn my 50mm FA f1.4 into a 283mm f1.4.
Or turn something modest like a M 200 f4 into a 1130mm lens.

Potentially a lot of fun to be had with this.

Or in APS-C terms, is the crop factor even greater - at 8.5? Wow.
09-04-2011, 06:01 AM   #3
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WOW, it's SO compact!! Now I can fit it in my pocket and take it anywhere.

(If you haven't guessed, I still fail to see the point of the Q)
09-04-2011, 06:06 AM   #4
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Hahha thats hilarious.

09-04-2011, 06:11 AM - 1 Like   #5
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QuoteOriginally posted by maxfield_photo Quote
WOW, it's SO compact!! Now I can fit it in my pocket and take it anywhere.

(If you haven't guessed, I still fail to see the point of the Q)


Yep, this is just about the stupidest thing Pentax has ever done.
09-04-2011, 06:31 AM - 1 Like   #6
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QuoteOriginally posted by rparmar Quote
Yep, this is just about the stupidest thing Pentax has ever done.
Well, look at a NEX with any lens aside from the 16mm pancake on it. Same issue of size.

But look what the K-mount adapter lets you do:




The top right is the standard Q lens, the bottom right pic is shot using the DA*300mm on the Q, at an effective 1500mm + in 35mm terms. That's a lot of affordable reach, with [potentially] OK looking IQ.
09-04-2011, 06:43 AM   #7
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QuoteOriginally posted by rawr Quote
Well, look at a NEX with any lens aside from the 16mm pancake on it. Same issue of size.

But look what the K-mount adapter lets you do:

The top right is the standard Q lens, the bottom right pic is shot using the DA*300mm on the Q, at an effective 1500mm + in 35mm terms. That's a lot of affordable reach, with [potentially] OK looking IQ.
I was there and the IQ was very acceptable. These are all 50 - 60cm odd size prints, to pull off that much from such tiny sensor is feat in itself.



All we need is a 'Q-Haters' forum. It would have more traffic than normal q forum.

09-04-2011, 07:07 AM   #8
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QuoteOriginally posted by jogiba Quote
Looks interesting.
Looks silly
09-04-2011, 07:08 AM   #9
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QuoteOriginally posted by rawr Quote
That's awesome, esp given the 5.67 crop factor of the Q.

Now I can turn my 50mm FA f1.4 into a 283mm f1.4.
Or turn something modest like a M 200 f4 into a 1130mm lens.

Potentially a lot of fun to be had with this.

Or in APS-C terms, is the crop factor even greater - at 8.5? Wow.
Max. exposure 1/2000 at Pentax Q.
09-04-2011, 07:43 AM   #10
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QuoteOriginally posted by ogl Quote
Max. exposure 1/2000 at Pentax Q.
Actually, with the K-Q adapter, you are using the electronic shutter which has a max shutter speed of 1/8000. Even with the Quality line lenses with the Copal shutters in the lens, you can specify to use the electronic shutter (with the leaf shutter in the lens acting only as aperture blades) if you need faster than the leaf shutter's 1/2000 highest speed, but you also have the option of using the built in 2 stop ND filter.

Scott
09-04-2011, 08:21 AM   #11
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It looks silly.

But it has potential indeed.
One is the crop factor on long or fast lenses.
Another is the higher dof for macro.
09-04-2011, 08:22 AM   #12
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Aha. So using non-Q lenses I can get 1/8000/sec shutter speed? I never noticed that in any of the PR material.

Even so, shutter speed isn't such a big deal. 1/2000 is plenty for most scenarios. What's most interesting [to me] are the crazy long focal lengths with full sensor-shift stabilisation (and no tele-convertors) that the KQ adapter makes possible (and affordable).
09-04-2011, 08:25 AM - 1 Like   #13
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QuoteOriginally posted by rawr Quote
That's awesome, esp given the 5.67 crop factor of the Q.

Now I can turn my 50mm FA f1.4 into a 283mm f1.4.
Or turn something modest like a M 200 f4 into a 1130mm lens.

Potentially a lot of fun to be had with this.

Or in APS-C terms, is the crop factor even greater - at 8.5? Wow.
Hi rawr,

I believe that the Q's crop factor is 5.53x, and since this gives you 35mm EQ as does the Pentax DSLR's crop factor, in APS-C terms, you'd need to divide by the DSLR's factor to get an equivalent for them. The crop factor which gives you the equivalent actual FL on an APS-C camera for a lens on the K mount lens on a Q is 3.61x. Thus a 100mm lens would be the FOV equivalent of 553mm on a 35mm camera and a 361mm lens on a 1.53x crop sensor camera like the Pentax DSLRs.

To make things more confusing, if you shoot macro, with the same lens on a Q compared to, say the K-5, at Minimum Focusing Distance, The magnification ratio stays at 1:1, but the magnification factor grows as the sensor gets smaller. The same lens on a 36x24 sensored camera would reproduce a 36mm long subject at lifesize on the sensor. On a K-5, it would be a 23.4mm subject, and on a Q, it would be a 6.17mm subject. So effectively, the Q has about a 3.8x magnification advantage over an APS-C DSLR when shooting macro. Of course, DOF would be the same for all three at MFD since it's the same lens, but with the magnification difference, you could shoot a Q at a greater working distance to get the same frame fill as you'd get with APS-C, so you'd get greater DOF with the additional distance at a given Av.

Scott
09-04-2011, 08:26 AM   #14
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QuoteOriginally posted by ogl Quote
Max. exposure 1/2000 at Pentax Q.
Just use ND filter like what folks use to get over the same limitation on any other camera with this sort of limitation.
Nothing new. Been done since film days.
Camera is a dead object. Human mind is not.
09-04-2011, 08:51 AM   #15
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QuoteOriginally posted by rawr Quote
Aha. So using non-Q lenses I can get 1/8000/sec shutter speed? I never noticed that in any of the PR material.

Even so, shutter speed isn't such a big deal. 1/2000 is plenty for most scenarios. What's most interesting [to me] are the crazy long focal lengths with full sensor-shift stabilisation (and no tele-convertors) that the KQ adapter makes possible (and affordable).
Hi rawr,

It's not in the PR material that I know of, but it's in the Owner's manual, if I read it correctly. The manual is available online at:

http://www.pentax.jp/english/support/man-pdf/q.pdf

On page 68 in the Custom Menu, there is a menu choice where you can enable the electronic shutter. On page 226, there is an explanation in the footnotes.

You are correct that it's not really a big deal. irregardless, since none of the K mount lenses have a copal shutter in the lens, the camera would default to the electronic shutter anyway when using the K-Q adapter.

I don't know if the SR works with MF lenses. There doesn't seem to be a manual setting of FL when using MF lenses, so it's possible that SR is only usable with actual Q mount lenses. Zxaar mentioned this in his post about trying the K-Q adapter, but the Pentax people were apparently vague. I wouldn't count on it.

Scott
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