Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
10-16-2014, 01:58 PM   #1
Pentaxian
LFLee's Avatar

Join Date: Aug 2009
Location: Western MA
Photos: Gallery | Albums
Posts: 2,264
Faster lens adapted to P67 & P645?

Hi all,

the 'fastest' lens in the 645 (via adapter) and 67 line is ... the P67 105mm f2.4 lens?

My question is, what is the fastest lens available (from other brand) that can be adapted to P67 or P645?

I read somewhere someone adapt a Hassy 100mm f2 lens to P645... and that's about it. Any lens faster than f2 that can be adapted?


Lee

10-16-2014, 02:21 PM   #2
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 43,032
QuoteOriginally posted by LFLee Quote
I read somewhere someone adapt a Hassy 100mm f2 lens to P645... and that's about it. Any lens faster than f2 that can be adapted?
I'm not sure but it's highly unlikely, due to size.

Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)



PentaxForums.com's high server and development costs are user-supported. You can help cover those costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

10-16-2014, 02:28 PM   #3
Pentaxian




Join Date: Jul 2009
Location: Seattle
Posts: 7,103
Shoot the 165/2.8 on your 67II and you'll get really shallow DOF if that is what you're after.
10-16-2014, 02:49 PM   #4
Site Supporter




Join Date: Jan 2010
Location: Michigan
Photos: Gallery
Posts: 2,179
What about the shutter?

10-16-2014, 05:28 PM   #5
Pentaxian




Join Date: May 2010
Location: Sydney
Posts: 503
I would love to find a wide angle that is faster than the 25mm f4 or the 35mm f3.5. Contax 645 had a 45mm f2.8, but don't know if it can be adapted - and in any case, it's not really wide enough... Any suggestions?

I'm not looking for this to allow narrow depth of field, but to assist with star photography where a wide aperture would help to avoid high ISOs. Great though the high ISOs are on the 645Z, it would still be better if they can be minimised.
10-16-2014, 05:49 PM   #6
Pentaxian
LFLee's Avatar

Join Date: Aug 2009
Location: Western MA
Photos: Gallery | Albums
Posts: 2,264
Original Poster
QuoteOriginally posted by Adam Quote
I'm not sure but it's highly unlikely, due to size.
I could be wrong about Hassy or Contax, but I saw it in the PENTAX 645 facebook group, the guy adapt it (with adapter available for purchase), but pretty sure it is a 100mm f2 lens. He is selling his camera body since he think P645n is better.... I can't find that post anymore.

---------- Post added 10-16-2014 at 08:52 PM ----------

QuoteOriginally posted by tuco Quote
Shoot the 165/2.8 on your 67II and you'll get really shallow DOF if that is what you're after.
oh, I am just wondering... I remember seeing some Russian lens selling on ebay that claimed they able to adapt to P67 mount, they are fast and have strange/unique rendering...
10-17-2014, 03:29 AM   #7
672
Pentaxian




Join Date: Dec 2010
Location: santa monica
Photos: Gallery
Posts: 418
LFLee, If you want strange and unique rendering, there is a somewhat rare "lens baby for P67" on the used market. Hard to find but interesting results. Someone here has one but i haven't seen their work lately.
10-17-2014, 05:52 AM   #8
Pentaxian




Join Date: Jul 2009
Location: Seattle
Posts: 7,103
QuoteOriginally posted by 672 Quote
... Someone here has one but i haven't seen their work lately.
I have one but I haven't used it in years.

10-17-2014, 06:32 AM   #9
672
Pentaxian




Join Date: Dec 2010
Location: santa monica
Photos: Gallery
Posts: 418
perhaps sell it to one of us?
10-17-2014, 06:39 AM   #10
Loyal Site Supporter




Join Date: Dec 2008
Location: NJ, USA
Photos: Gallery | Albums
Posts: 321
this is funny as I had suggested that a 100mm ish f2 645 lens would be equal to a 85 f1.4 and great for portrait work. I was told that f2.8 was enough for thin DOF and people were deluding themselves that the 35mm format needed a 1.4 lens.
10-17-2014, 07:34 AM   #11
Pentaxian




Join Date: Jul 2009
Location: Seattle
Posts: 7,103
QuoteOriginally posted by 672 Quote
perhaps sell it to one of us?
Perhaps I should. Better it's being used than sitting around doing nothing. I'll give that some thought.

Some attributes about that lens are that it has a sharper center spot that you basically move around. To change aperture, you have to install a different diameter washer in the lens. And you get basically stop-down metering. So you won't be taking your shots very fast in general. And maybe you'll want to use a tripod most the time so you can fiddle with adjusting the 3 knobs that move the focus spot around.
10-17-2014, 07:53 AM   #12
Senior Member
johnsey's Avatar

Join Date: Mar 2008
Location: Fargo, ND
Posts: 113
There is the Mamiya 645 80mm 1.9 but Mamiya has a shorter flange distance so converting/adapting would be difficult. You would be best off just grabbing an old Mamiya body for the lens if you need need the speed. Also keep in mind your only gaining about a stop over your current best options.
That is as wide open as your going to see and at that aperture and your DOF will be incredibly shallow, it wouldn't be cost effective or practical to go any faster in medium format.

Last edited by johnsey; 10-20-2014 at 05:12 AM.
10-17-2014, 08:24 AM   #13
Senior Member




Join Date: Mar 2007
Location: Lower Left Coast, USA
Photos: Gallery
Posts: 255
If only a company like Samyang would make some fast wide inexpensive primes. I bet they could make a 25mm f2 that's lighter than the 645 DA 25mm. It would work for me since I don't need AF or SR on a lens like that. If they could do that for $2K or less I'd bite.
10-17-2014, 09:52 AM   #14
Pentaxian




Join Date: Feb 2009
Location: Arizona
Posts: 910
QuoteOriginally posted by iCrop Quote
If only a company like Samyang would make some fast wide inexpensive primes
Wide medium format SLR lenses require a large diameter front group to attain their desired speed. Because of the mirror box, the design must be very asymmetrical with a negative group in front of the stop and strong positive group behind it. You could easily end up with a 100mm diameter front element on such a lens. Big,heavy and expensive come to mind.
10-17-2014, 02:46 PM   #15
Senior Member




Join Date: Mar 2007
Location: Lower Left Coast, USA
Photos: Gallery
Posts: 255
QuoteOriginally posted by desertscape Quote
Wide medium format SLR lenses require a large diameter front group to attain their desired speed. Because of the mirror box, the design must be very asymmetrical with a negative group in front of the stop and strong positive group behind it. You could easily end up with a 100mm diameter front element on such a lens. Big,heavy and expensive come to mind.
OK, I'll compromise. F2.8
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!
645d, 645z, camera, f2, lens, medium format, p67
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fotodiox Pentax 67 Lens to P645 Camera adapter LaHo Pentax Medium Format 18 01-02-2016 11:58 AM
Adapted Lenses - is faster better? stormtech Pentax Q 38 12-22-2012 06:02 AM
Latest additions to my P67 and P645 lens lineup bensonga Pentax Medium Format 10 12-11-2012 04:36 PM
P645 lenses on P67 Joburger Pentax Medium Format 3 04-05-2011 02:08 PM



All times are GMT -7. The time now is 07:09 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