Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
08-03-2011, 09:45 AM   #1
New Member




Join Date: Jul 2011
Posts: 15
How do I mount Panasonic 20mm lens on my K5?

Hi,

This may be a strange question, because usually people do it the other way around (i.e. using their Pentax lenses on Micro 4/3 bodies), but how do I mount my Panasonic 20mm f/1.7 lens (from my Pana GF1) on to my Pentax K5?

Anyone tried that yet? Can't seem to find any adapters for 4/3rd lens on Pentax body. Any help/links much appreciated.

Thanks.

08-03-2011, 09:53 AM   #2
Veteran Member
crewl1's Avatar

Join Date: Jul 2010
Location: Los Angeles, CA
Photos: Gallery | Albums
Posts: 9,799
I have absolutely no knowledge of this but would suggest that the reason you see adapters for Pentax on 4/3 and not the other way around is that the registration distance* for a 4/3 lens may be too short, which would require burying the lens in the Pentax body and interfering with the mirror.

*DIstance from rear element to sensor to achieve infinity focus.
08-03-2011, 09:57 AM   #3
Veteran Member
RBellavance's Avatar

Join Date: Nov 2006
Location: Near Montréal, Canada
Photos: Gallery
Posts: 1,716
QuoteOriginally posted by crewl1 Quote
I have absolutely no knowledge of this but would suggest that the reason you see adapters for Pentax on 4/3 and not the other way around is that the registration distance* for a 4/3 lens may be too short, which would require burying the lens in the Pentax body and interfering with the mirror.

*DIstance from rear element to sensor to achieve infinity focus.
That, and the lens' image circle almost certainly does not cover the sensor of the K-5, which is larger than that of the m4/3 cameras.
08-03-2011, 10:06 AM   #4
Veteran Member




Join Date: Mar 2011
Photos: Gallery | Albums
Posts: 303
The registration distance for m4/3 is about 19 mm, whereas the registration distance for K-mount lenses is about 45mm - you would need either need a way to mount the lens inside your camera around where your mirror currently is or have optical correction built into the adapter to get the proper registration distance for full range of focus.

EDIT: What they said!

08-03-2011, 10:44 AM   #5
Pentaxian
eddie1960's Avatar

Join Date: Aug 2010
Location: Toronto
Photos: Gallery | Albums
Posts: 12,875
I'll Add that if an adapter did exist it would reuire additional optics and therefor degrade the quality ven if the image circle covered the apsc size (which it doesn't)
this of course is the appeal of mft cameras the ability to take almost any lens (also one of the things that makes the GXR M mount module coming out so appealing since almost any lens will be able to mount with an adapter)
08-03-2011, 11:39 AM   #6
New Member




Join Date: Jul 2011
Posts: 15
Original Poster
Thanks folks. I was hoping I could use this wider angle lens on my K5 instead of buying a new one in that range, but looks like I'll have to abandon that idea for now.
08-03-2011, 11:40 AM   #7
Senior Member
RBullCZ's Avatar

Join Date: Mar 2009
Location: Prague, Czech Republic
Photos: Albums
Posts: 139
Seems like the easiest way is to get the Panasonic body along with that lens if you really want to use it
08-03-2011, 01:28 PM   #8
Veteran Member
RioRico's Avatar

Join Date: Jun 2008
Location: Limbo, California
Posts: 11,264
Yes, it can be mounted, either normally or reversed. No, it won't reach infinity focus. You will have Yet Another Closeup Lens (YACL). I have tried this with 20mm and 50mm cine lenses. They're really nice -- if I only want to shoot subjects one inch away.

Register (flange focal distance):

17.526mm -- CCTV/cine
18.0mm ---- Sony NEX
20.0mm ---- m4/3
25.5mm ---- Samsung NX
45.46mm --- Pentax

08-03-2011, 10:05 PM   #9
New Member




Join Date: Jul 2011
Posts: 15
Original Poster
QuoteOriginally posted by RBullCZ Quote
Seems like the easiest way is to get the Panasonic body along with that lens if you really want to use it
Oh, I have it mounted on a Panasonic GF1 now. Was exploring if I could also mate it with my K5 since the lens is actually a very good one.
08-03-2011, 11:05 PM   #10
Veteran Member
twitch's Avatar

Join Date: Nov 2009
Posts: 4,571
There's been a couple of DA21's for sale in the marketplace recently, just sayin'
08-04-2011, 07:39 AM   #11
Veteran Member
johnmflores's Avatar

Join Date: Apr 2009
Location: Somerville, NJ
Photos: Gallery | Albums
Posts: 5,296
QuoteOriginally posted by mr.sinha Quote
Oh, I have it mounted on a Panasonic GF1 now. Was exploring if I could also mate it with my K5 since the lens is actually a very good one.
Yes, it is a very good lens. Some of it's pixie-dust magic is due to the fact that it's mounted to a Panasonic camera that is aware of its weaknesses and does a little bit of digital trickery to compensate for them. I don't mind at all - I'm most interested in the final image - but even if you could mount it on the K-5 the results may surprise you.

As @Twitch suggests, the Pentax DA21 is a very very good lens as well and the closest focal length equivalent. Slower @ F3.2, but you can crank up the ISO on the K-5 and shoot until the cows come home.
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, dslr, k-5, k-5 ii, k-5 iis, k5, lens, panasonic, pentax, pentax k-5
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: Panasonic Lumix GF1 MFT with 20mm f/1.7 lens, box, etc. (US) InlawBiker Sold Items 0 04-04-2011 08:57 AM
For Sale - Sold: BrandNew Panasonic GF2 with 14mm F2.5 lens (Worldwide) shind0u Sold Items 2 03-10-2011 11:21 AM
For Sale - Sold: Mir-47K 20mm f2.5 (K-Mount) (Worldwide) FotoPete Sold Items 4 02-18-2011 08:43 AM
Sigma 10-20mm Stiff Mount oxidized Pentax SLR Lens Discussion 6 05-07-2010 12:39 AM
Zuiko Auto-Macro Lens 20mm f/2 in Pentax Mount!!!! Tyler Pentax SLR Lens Discussion 2 05-07-2008 07:54 AM



All times are GMT -7. The time now is 09:36 AM. | See also: NikonForums.com, CanonForums.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