Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
06-01-2012, 04:52 AM   #1
New Member




Join Date: Jun 2012
Posts: 15
3d party AF lens on AF SLR

Hi.
I'm an happy possessor of an old MX. Recently I passed to digital with a K-5 and bought a couple of AF FF lenses in hope that someday Pentax will produce a digital FF body:

Sigma 24-70 2.8
Tamron 70-200 2.8

After some months of AF with K-5 I feel really less confident in manual focusing with my MX (age? misuse? practice?) even if I still love the camera I began my hobby.
So the question: is there a Pentax film SLR with autofocus that can be used with full functionality with my FF AF third party lenses?
In particular: is there a Pentax camera model that allows working in AV mode freely (and directly!) setting the desired F/stop value?

Thanks in advance!

06-01-2012, 05:15 AM   #2
Forum Member
Jüri's Avatar

Join Date: Feb 2010
Location: Tartu, Estonia
Posts: 83
Any AF lens designed for Pentax will work with any AF Pentax camera (exept for the ME F I guess). Take a look at the MZ/ZX series cameras, most of them allow manual aperture control through body.
06-01-2012, 06:26 AM   #3
New Member




Join Date: Jun 2012
Posts: 15
Original Poster
Example MZ-5n: no body direct control on aperture value

Hi,
thanks for your time!

Maybe my posting wasn't too clear: sorry.
At the moment I'm looking through some pdf manuals on Pentax AF SLR (for example the MZ-5n ...).
From what I can see it seems you can set the aperture value only setting it manually (and directly) on the lens, not on the body of the camera.
In my mind it means you can use with full functionality only lenses with the aperture ring phisically placed on the lens.

If you use a "modern" lens with no aperture ring (like Sigma 24-70 EX DG or Tamron 70-200 ...) I think you are forced to set it directly by the camera body (as you do with the modern DSLR using the dedicated rolling wheel in the front or on the back of the camera body).

So I'm looking for a Pentax film SLR which can let you work in AV setting the aperture value manually on the camera body, since I can't (or maybe I'm not able to...) do it on the lens.
Hope this can help to understand better.
Thanks anyway: have a nice weekend!
06-01-2012, 06:33 AM   #4
Site Supporter
boriscleto's Avatar

Join Date: Dec 2009
Location: Liverpool, NY
Photos: Gallery
Posts: 12,310
Pentax made two different styles of AF slr. One style, like the MZ-5N, had traditional style ring controls. The other style, like the MZ-7, works more like current dslrs.

Pentax MZ-7/ZX-7 - Autofocus Film SLRs - Pentax Camera Reviews and Specifications

The MZ-7 has M, AV, TV, AutoPict, and scene modes.

06-01-2012, 08:12 AM   #5
New Member




Join Date: Jun 2012
Posts: 15
Original Poster
ZX-7 and its "select switch"

Wonderful!
From the manual of the zx-7 it seems you can use the so called "select switch" under the shutter button for setting the aperture value in AV mode!
I'd like to try with one of my lenses to be sure it works fine.
Thank you very much!

I know personally many Pentax owners that use with ease old manual lenses on modern DSLR: and I do it frequently myself too.
But am I the only one in the world that is trying to burn his last Velvia slides using "3rd party modern lenses" on "old camera AF body in AV mode"?


PS: (please answer "no" to the question, or you'll have in your same forum a 40 years old guy overwhelmed with guilt . . . )
06-01-2012, 09:26 AM   #6
Pentaxian
pete-tarmigan's Avatar

Join Date: Apr 2009
Location: Conception Bay South, New-fun-land
Photos: Gallery
Posts: 948
QuoteOriginally posted by berand71 Quote
In particular: is there a Pentax camera model that allows working in AV mode freely (and directly!) setting the desired F/stop value?

Thanks in advance!
Check the camera body database on this forum for bodies with "Av" exposure mode. I suspect that the list of bodies without shutter priority is much shorter than the list with shutter priority, especially since that feature was introduced in the mid-1970s, long before autofocus.

https://www.pentaxforums.com/camerareviews/

Last edited by pete-tarmigan; 06-01-2012 at 09:39 AM. Reason: error
06-01-2012, 11:58 AM   #7
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,314
QuoteOriginally posted by berand71 Quote
Hi.
I'm an happy possessor of an old MX. Recently I passed to digital with a K-5 and bought a couple of AF FF lenses in hope that someday Pentax will produce a digital FF body:

Sigma 24-70 2.8
Tamron 70-200 2.8

After some months of AF with K-5 I feel really less confident in manual focusing with my MX (age? misuse? practice?) even if I still love the camera I began my hobby.
So the question: is there a Pentax film SLR with autofocus that can be used with full functionality with my FF AF third party lenses?
In particular: is there a Pentax camera model that allows working in AV mode freely (and directly!) setting the desired F/stop value?

Thanks in advance!
I moved from MF to AF when I bought a PZ-1. it is really a great camera, and I still use it, but I am having a recurring mental problem when I do.

with dual thumb wheels the interface is so similar to my digital cameras, that I fund myself constantly looking at the camera back waiting for the instant review image to appear

actually it is a great camera, good AF, bright viewfinder, 1/250 flash sync, and 1/8000 shutter speed. it is a little on the big side, but i think that can be overlooked

note however, you don't list your lens type (i.e. screw drive or HSM) the PS1 or any film camera for that matter cannot support HSM only lenses
06-01-2012, 05:42 PM   #8
Senior Member
johnha's Avatar

Join Date: Apr 2012
Location: Lancashire, UK
Posts: 250
QuoteOriginally posted by Lowell Goudge Quote
note however, you don't list your lens type (i.e. screw drive or HSM) the PS1 or any film camera for that matter cannot support HSM only lenses
The MEF works fine with the Horribly Slow Motor lens

06-04-2012, 06:24 AM   #9
New Member




Join Date: Jun 2012
Posts: 15
Original Poster
Here are the AF lenses

Ok,
it seem the thing begin to be a little too complex to me. Must admit I'm a little surprised how "simple" and "immediate" was working with my old cameras (MX, LX, ...) and manual focus lenses against these modern ones
Here are the 3d party AF lenses in Pentax mount I'm using with K-5 and K-100:

Sigma 24-70 mm 2.8 EX DG Macro Pentax (year 2011) (no aperture ring on the lens, nor an "A" position)
Tamron 70-200 2.8 Di LD Macro Pentax (year 2011) (no aperture ring on the lens, nor an "A" position)

Here in Italy the official import seller confirmed me (if it needs...) these lenses aren't HSM when used in Pentax mount.
I'd like to use them in AV mode with a Pentax film camera setting the F/stop aperture directly from the body ("thumb wheel" on the back, "select switch" or other): has anybody tried those lenses with any Pentax SLR to check if they work correctly?
06-04-2012, 06:36 AM   #10
New Member




Join Date: Jun 2012
Posts: 15
Original Poster
Thanks for you help ...
06-06-2012, 02:16 AM   #11
New Member




Join Date: Jun 2012
Posts: 15
Original Poster
Confirmation: not possible ... sigh.

I've received a confirmation from an Italian Pentax dealer: it isn't possible have a direct control on F/stop vaue using my 3d party lenses with (for example) Pentax mz-5 SLR.

Maybe this time, for this particular application Canon and Nikon systems have a little (?) advantage . . .

Bye.
06-06-2012, 01:06 PM   #12
Site Supporter




Join Date: Jan 2011
Location: San Francisco
Photos: Gallery
Posts: 61
QuoteOriginally posted by berand71 Quote
I've received a confirmation from an Italian Pentax dealer: it isn't possible have a direct control on F/stop vaue using my 3d party lenses with (for example) Pentax mz-5 SLR.

Maybe this time, for this particular application Canon and Nikon systems have a little (?) advantage . . .

Bye.
If I understand what you are saying I don't belive that is true. On the MZ-5 (ZX-5) you control the F/stop value (aperture) on the lens body. You will need a lens with an aperture ring. This is the same whether it is a Pentax or a third party lens. You can only use the MZ-5 in Shutter priority or programed mode if there is no manual aperture setting. The MZ7 appears to be able to use the aperture ring or body control but I don't own one so I am not sure.

If you want Shutter priority you will need a Lens with an "A" setting.

Jim
06-07-2012, 06:07 AM   #13
Forum Member
Jüri's Avatar

Join Date: Feb 2010
Location: Tartu, Estonia
Posts: 83
QuoteOriginally posted by berand71 Quote
I've received a confirmation from an Italian Pentax dealer: it isn't possible have a direct control on F/stop vaue using my 3d party lenses with (for example) Pentax mz-5 SLR.

Maybe this time, for this particular application Canon and Nikon systems have a little (?) advantage . . .

Bye.
Some Pentax film SLR cameras allow it, some don't. Just like some Nikons and Canons do and some don't. The MZ-5 as a "retro" camera really doesn't allow manual aperture control through body, but there are cameras that do. The latter should true for instance for Z-70, PZ-1 and MZ-7. There are probably more, but I don't know them all.
06-07-2012, 06:38 AM   #14
Loyal Site Supporter
eddie1960's Avatar

Join Date: Aug 2010
Location: Toronto
Photos: Gallery | Albums
Posts: 12,168
the PZ1 would be a fantastic camera for this IMO. or the MZ-S (MZS will cost you as much as a good used K7 though). the MZS is closer to the digital bodies but some people hate it. the PZ1 is built like a tanks and has very good control (as pointed out by Lowell)
I'm personally watching for a good deal on a PZ1 myself
06-07-2012, 02:02 PM   #15
Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 26,234
QuoteOriginally posted by berand71 Quote
Maybe this time, for this particular application Canon and Nikon systems have a little (?) advantage . . .
Ummm...I would blame the maker of your 3rd-party lens. You might also want to take a look at similar offerings for Nikon and Canon. The lack of aperture rings is not unique to K-mount. Ditto for lack of backward compatibility.


Steve
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!
af, camera, ff, k-5, party, pentax, slr
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
SLR Magic Toy Lens 11mm f/1.4 lens for Pentax Q Mistral75 Pentax Q 5 03-05-2012 10:28 AM
Why there is no 3rd party WR lens? ducdao Pentax DSLR Discussion 17 12-08-2011 03:45 AM
Conversion of SLR lens to DSLR lens with regards to wide angle tvance85 Troubleshooting and Beginner Help 24 11-10-2011 11:48 AM
So what do YOU use as your party lens? janstew Pentax SLR Lens Discussion 24 07-25-2010 03:32 PM
Suggestion Change name of Film SLR and/or SLR Lens sub-forums clawhammer Site Suggestions and Help 4 07-31-2008 06:55 AM



All times are GMT -7. The time now is 09:42 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