Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
09-04-2011, 05:04 AM   #1
Banned




Join Date: Sep 2006
Location: Millstone,NJ
Posts: 6,491
Pentax Q - K-mount adapter !

Looks interesting.



09-04-2011, 05:20 AM   #2
Pentaxian




Join Date: Jun 2009
Location: GMT +10
Photos: Albums
Posts: 10,575
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
Pentaxian
maxfield_photo's Avatar

Join Date: Mar 2011
Location: Cincinnati, OH
Posts: 1,216
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
Veteran Member
Christopher M.W.T's Avatar

Join Date: Jun 2009
Location: Geelong, Victoria, Australia
Posts: 1,689
Hahha thats hilarious.

09-04-2011, 06:11 AM - 1 Like   #5
Veteran Member
rparmar's Avatar

Join Date: Jan 2008
Photos: Gallery
Posts: 8,783
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
Pentaxian




Join Date: Jun 2009
Location: GMT +10
Photos: Albums
Posts: 10,575
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
Veteran Member




Join Date: Jul 2009
Location: kobe/japan
Posts: 510
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
ogl
Pentaxian
ogl's Avatar

Join Date: Dec 2007
Location: Siberia
Photos: Gallery | Albums
Posts: 7,112
QuoteOriginally posted by jogiba Quote
Looks interesting.
Looks silly

09-04-2011, 07:08 AM   #9
ogl
Pentaxian
ogl's Avatar

Join Date: Dec 2007
Location: Siberia
Photos: Gallery | Albums
Posts: 7,112
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
Pentaxian




Join Date: Oct 2006
Location: Chicago suburb, IL, USA
Posts: 1,535
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
Site Supporter




Join Date: Oct 2009
Location: North
Photos: Gallery
Posts: 3,772
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
Pentaxian




Join Date: Jun 2009
Location: GMT +10
Photos: Albums
Posts: 10,575
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
Pentaxian




Join Date: Oct 2006
Location: Chicago suburb, IL, USA
Posts: 1,535
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
Site Supporter




Join Date: Oct 2009
Location: North
Photos: Gallery
Posts: 3,772
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
Pentaxian




Join Date: Oct 2006
Location: Chicago suburb, IL, USA
Posts: 1,535
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
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
camera, k-mount adapter, mirrorless, pentax q, pentax q10, pentax q7, q10, q7
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pentax Q to K mount adapter ? jogiba Pentax Camera and Field Accessories 23 12-08-2012 12:47 AM
Can I use PK mount M42 adapter on Pentax K-r vass Pentax K-r 6 12-28-2010 07:08 AM
For Sale - Sold: Genuine Pentax Mount Adapter K (M42 to K-mount) zx-m Sold Items 6 01-30-2009 01:22 AM
Pentax Mount Adapter K vs Chinese Mount Adapter Vylen Pentax SLR Lens Discussion 7 01-23-2009 01:03 AM
For Sale - Sold: *New* Pentax Mount Adapter-K M42 to K-Mount X Man Sold Items 4 12-31-2008 04:10 PM



All times are GMT -7. The time now is 07:43 AM. | See also: NikonForums.com, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top