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Gerrit
Joined: 05 Jan 2008
Posts: 54
Location: Netherlands
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 Posted: Mon Dec 29, 2008 8:50 pm Post subject: SMCPENTAX-F AF ADAPTER 1.7X |
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Gerrit wrote:
I wonder has someone experience with this tool? Makes it really an AF lens from your MF lens? |
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Attila
Joined: 24 Feb 2007
Posts: 57853
Location: Hungary
Expire: 2025-11-18
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| Posted: Mon Dec 29, 2008 9:22 pm Post subject: |
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Attila wrote:
I don't think so , if attached MF lens in closest position I don't think so you can take shoot at infinity, it will not rotate MF lens focusing mechanism.
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Rusty
Joined: 06 Nov 2008
Posts: 435
Location: Mosselbay, South Africa
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| Posted: Mon Dec 29, 2008 9:28 pm Post subject: |
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Rusty wrote:
It is a 1.7 times teleconverter that you can use on an af body with af lenses (simply a normal teleconverter with electrical contacts to connect the lens contacts through the converter to the cam ) so that the af is still operational
Daniel |
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soikka
Joined: 11 Jun 2008
Posts: 534
Location: Finland
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| Posted: Mon Dec 29, 2008 9:32 pm Post subject: Re: SMCPENTAX-F AF ADAPTER 1.7X |
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soikka wrote:
| Gerrit wrote: |
| I wonder has someone experience with this tool? Makes it really an AF lens from your MF lens? |
Yes, it does but it has it's limitations.
You'll have to prefocus manually close to the correct focus, with some shorter lenses you can leave the lens to infinity and focus with adapter for example from 2m- infinity. I have the adapter, and it's pretty usable tool if you need af.
_________________
DSLR: K-5,K20d+Grip, Ist*Ds
Film: MZ-5n, LX, MX+winder, SuperA+winder, ME Super,
M-series: 28/2.8, 35/2, 40/2.8, 135/3.5, 75-150/4, A-series: 50/1.7, Super-Taks: 55/1.8, 105/2.8, S-M-C Taks: 28/3.5, 50/1.4, 85/1.8, Sigma SW2 24/2.8, Tamron SPs: 90/2.5(I), 180/2.5, 500/8, Rikenon XR 35-70/3.5, Cosinon 40/2.5, F-1.7x AF-adapter, Olympus XA |
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soikka
Joined: 11 Jun 2008
Posts: 534
Location: Finland
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| Posted: Mon Dec 29, 2008 9:36 pm Post subject: |
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soikka wrote:
| Rusty wrote: |
It is a 1.7 times teleconverter that you can use on an af body with af lenses (simply a normal teleconverter with electrical contacts to connect the lens contacts through the converter to the cam ) so that the af is still operational
Daniel |
Actually it's more than that. It has it's own AF-mechanism built in.
_________________
DSLR: K-5,K20d+Grip, Ist*Ds
Film: MZ-5n, LX, MX+winder, SuperA+winder, ME Super,
M-series: 28/2.8, 35/2, 40/2.8, 135/3.5, 75-150/4, A-series: 50/1.7, Super-Taks: 55/1.8, 105/2.8, S-M-C Taks: 28/3.5, 50/1.4, 85/1.8, Sigma SW2 24/2.8, Tamron SPs: 90/2.5(I), 180/2.5, 500/8, Rikenon XR 35-70/3.5, Cosinon 40/2.5, F-1.7x AF-adapter, Olympus XA |
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Rusty
Joined: 06 Nov 2008
Posts: 435
Location: Mosselbay, South Africa
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| Posted: Mon Dec 29, 2008 9:44 pm Post subject: |
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Rusty wrote:
Is the af drive motor on pentax on the body of the cam and not in the lens like eos ?
If thats the case i can understand the operation 
edit : no i still dont get it like Attila said there is no way i can see any af mechanism turning the focusing ring manually on a mf lens
Am i missing something here ?
(i'm a bit slow after a long day  )
Last edited by Rusty on Mon Dec 29, 2008 9:50 pm; edited 1 time in total |
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soikka
Joined: 11 Jun 2008
Posts: 534
Location: Finland
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| Posted: Mon Dec 29, 2008 9:47 pm Post subject: |
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soikka wrote:
| Rusty wrote: |
Is the af drive motor on pentax on the body of the cam and not in the lens like eos ?
If thats the case i can understand the operation
(i'm a bit slow after a long day ) |
AF-drive motor is in fact in the body in Pentax. Only the newest SDM lenses have in-built AF-motors.
_________________
DSLR: K-5,K20d+Grip, Ist*Ds
Film: MZ-5n, LX, MX+winder, SuperA+winder, ME Super,
M-series: 28/2.8, 35/2, 40/2.8, 135/3.5, 75-150/4, A-series: 50/1.7, Super-Taks: 55/1.8, 105/2.8, S-M-C Taks: 28/3.5, 50/1.4, 85/1.8, Sigma SW2 24/2.8, Tamron SPs: 90/2.5(I), 180/2.5, 500/8, Rikenon XR 35-70/3.5, Cosinon 40/2.5, F-1.7x AF-adapter, Olympus XA |
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Rob Leslie
Joined: 20 Mar 2007
Posts: 1103
Location: UK Swindon
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| Posted: Mon Dec 29, 2008 9:58 pm Post subject: |
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Rob Leslie wrote:
An expensive bit of kit which I see as a bit of a novelty. I think they make it as a x1.7 converter to hide some of the quality loss from using a rear lens to focus?
I can't really see the value of it? AF lenses already have their faults without adding more to them!
http://cgi.ebay.com/SMC-PENTAX-F-AF-1.7X-ADAPTER-K20D-K200D-K100D-K10D-K110_W0QQitemZ200284488123QQcmdZViewItemQQimsxZ20081206?IMSfp=TL081206126010r15341
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Pentax K10D & K100D. Many Tamron Adaptall SP lenses, Fujinon f4.5 400mm. A loved Lens Baby 2, Lubitel triplet +++ and many film cameras. Mainly a Digital user inc G5, GR2
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Rusty
Joined: 06 Nov 2008
Posts: 435
Location: Mosselbay, South Africa
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| Posted: Mon Dec 29, 2008 10:00 pm Post subject: |
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Rusty wrote:
I get it now !
googled it and found out that it has an optical element that is driven by the af moter in the body, and does the focussing inside the adapter itself with the lens inside the adapter
learn something everyday  |
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Rusty
Joined: 06 Nov 2008
Posts: 435
Location: Mosselbay, South Africa
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| Posted: Mon Dec 29, 2008 10:03 pm Post subject: |
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Rusty wrote:
You can buy a REAL nice mf lens for that price  |
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soikka
Joined: 11 Jun 2008
Posts: 534
Location: Finland
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| Posted: Mon Dec 29, 2008 10:11 pm Post subject: |
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soikka wrote:
| Rusty wrote: |
You can buy a REAL nice mf lens for that price |
The prices of the adapter have become really high recently. At one point they were going for even higher than that price.
There is some quality loss of course, but if you wish to have the luxury to AF your manual focus lenses this is the only way for it.
Actually it works pretty good with good quality teles, which may be difficult to manually focus reliably. Haven't used mine that much though...
_________________
DSLR: K-5,K20d+Grip, Ist*Ds
Film: MZ-5n, LX, MX+winder, SuperA+winder, ME Super,
M-series: 28/2.8, 35/2, 40/2.8, 135/3.5, 75-150/4, A-series: 50/1.7, Super-Taks: 55/1.8, 105/2.8, S-M-C Taks: 28/3.5, 50/1.4, 85/1.8, Sigma SW2 24/2.8, Tamron SPs: 90/2.5(I), 180/2.5, 500/8, Rikenon XR 35-70/3.5, Cosinon 40/2.5, F-1.7x AF-adapter, Olympus XA |
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peterqd
Joined: 28 Feb 2007
Posts: 7447
Location: near High Wycombe, UK
Expire: 2014-01-04
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| Posted: Tue Dec 30, 2008 12:49 am Post subject: |
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peterqd wrote:
If they made a 1/1.6 converter that widened the angle to compensate for the crop sensor, that would be interesting.
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soikka
Joined: 11 Jun 2008
Posts: 534
Location: Finland
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| Posted: Tue Dec 30, 2008 9:12 am Post subject: |
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soikka wrote:
| peterqd wrote: |
| If they made a 1/1.6 converter that widened the angle to compensate for the crop sensor, that would be interesting. |
Tell me about it!
How ever it might be hard to do...
_________________
DSLR: K-5,K20d+Grip, Ist*Ds
Film: MZ-5n, LX, MX+winder, SuperA+winder, ME Super,
M-series: 28/2.8, 35/2, 40/2.8, 135/3.5, 75-150/4, A-series: 50/1.7, Super-Taks: 55/1.8, 105/2.8, S-M-C Taks: 28/3.5, 50/1.4, 85/1.8, Sigma SW2 24/2.8, Tamron SPs: 90/2.5(I), 180/2.5, 500/8, Rikenon XR 35-70/3.5, Cosinon 40/2.5, F-1.7x AF-adapter, Olympus XA |
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soikka
Joined: 11 Jun 2008
Posts: 534
Location: Finland
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| Posted: Tue Dec 30, 2008 9:15 am Post subject: |
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soikka wrote:
Here's some test shots from way back, that really doesn't tell you anything .
http://forum.mflenses.com/pentax-m35-2-testshots-t8589.html
My M35/2 is dreamy wide open without the converter too, but the AF-converter brings it to a new level. @F2.8 the image quality is pretty good.
The converter is made for longer lenses any how.
_________________
DSLR: K-5,K20d+Grip, Ist*Ds
Film: MZ-5n, LX, MX+winder, SuperA+winder, ME Super,
M-series: 28/2.8, 35/2, 40/2.8, 135/3.5, 75-150/4, A-series: 50/1.7, Super-Taks: 55/1.8, 105/2.8, S-M-C Taks: 28/3.5, 50/1.4, 85/1.8, Sigma SW2 24/2.8, Tamron SPs: 90/2.5(I), 180/2.5, 500/8, Rikenon XR 35-70/3.5, Cosinon 40/2.5, F-1.7x AF-adapter, Olympus XA |
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Dav5002
Joined: 20 Sep 2008
Posts: 5
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| Posted: Wed Dec 31, 2008 4:23 pm Post subject: Re: SMCPENTAX-F AF ADAPTER 1.7X |
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Dav5002 wrote:
| soikka wrote: |
| Gerrit wrote: |
| I wonder has someone experience with this tool? Makes it really an AF lens from your MF lens? |
Yes, it does but it has it's limitations.
You'll have to prefocus manually close to the correct focus, with some shorter lenses you can leave the lens to infinity and focus with adapter for example from 2m- infinity. I have the adapter, and it's pretty usable tool if you need af. |
Yes, it is correct, you need to be about there and it will auto-focus.
Look at my 180x1.7=306 Leica Elmarit auto focus and stabilized lens.
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Attila
Joined: 24 Feb 2007
Posts: 57853
Location: Hungary
Expire: 2025-11-18
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| Posted: Wed Dec 31, 2008 4:27 pm Post subject: |
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Attila wrote:
I always learn... thank you guys!
_________________
-------------------------------
Items on sale on Ebay
Sony NEX-7 Carl Zeiss Planar 85mm f1.4, Minolta MD 35mm f1.8, Konica 135mm f2.5, Minolta MD 50mm f1.2, Minolta MD 250mm f5.6, Carl Zeiss Sonnar 180mm f2.8
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Paul
Joined: 07 Mar 2007
Posts: 173
Location: Hamburg-Germany
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| Posted: Thu Jan 01, 2009 5:29 pm Post subject: |
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Paul wrote:
Yashica had the same idea with their AF-lenses, same TC with AF...
I had the Pentax 1.7x-AF-TC and found t not that interesting:
You HAVE to focus nearly correctly - on a macro-lens with the huge focus-range it's nonsense BTW.
As for the pure TC-Quality:
It's not the best either!
German ColorFoto tested the TC's and 135mm-lenses of the biug manufacturers in the 90's and while the Pentax 2.8/135 AF was quite good (not as good as the K 2.5/135 in comparison to Leica and Zeiss 2.8/135 like tested in the 80's) with the TC it lost much of it's optical quality.
The TC-135mm-combinations of most other manufacturers were better (except Oly IIRC).
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Paul
(SLR-experiences since 1981)
Pentax and Canon - Sony digital as well
too many lenses and flashes |
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Abbazz
Joined: 23 Jun 2007
Posts: 1098
Location: Jakarta
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| Posted: Sat Jan 03, 2009 2:23 am Post subject: |
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Abbazz wrote:
| Paul wrote: |
I had the Pentax 1.7x-AF-TC and found t not that interesting:
You HAVE to focus nearly correctly - on a macro-lens with the huge focus-range it's nonsense BTW. |
Who needs AF in macro?
With a normal lens (try the Pentax AF adapter with a Porst 55/1.2) or a short tele (the AF adapter works like a charm on the SMC-Takumar 85/1.8 or the Voigtländer Apo-Lanthar Macro 125/2.5), you just focus the lens to infinity and the autofocus will work throughout the usual range without having to touch the focusing ring. The Voigtländer in autofocus is very fun to use (sorry, I know this is Manual Focus Forum ).
Cheers!
Abbazz
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The 6x9 Photography Online Resource:
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Paul
Joined: 07 Mar 2007
Posts: 173
Location: Hamburg-Germany
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| Posted: Mon Jan 05, 2009 7:44 pm Post subject: |
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Paul wrote:
@Abazz
I used the 1.7x-TC with my Tamron 90 macro - which I'm using as a normal tele lens too.
Even in the normal focus range the TC couldn't focus everythind correctly because the lens moves the lens too much.
(totally diffent the Vivitar Series 1 28-105 where you have only some cm focus range whereas the Tammy has much more)
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Paul
(SLR-experiences since 1981)
Pentax and Canon - Sony digital as well
too many lenses and flashes |
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Spotmatic
Joined: 18 Aug 2008
Posts: 4045
Location: Netherlands
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| Posted: Mon Jan 05, 2009 10:14 pm Post subject: |
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Spotmatic wrote:
I had several copies of the SMC Pentax-F 1.7x AF adapter - mainly because of the inflated prices on eBay. I sold all of them for a good profit. However, I have used the adapter on several lenses, the Sigma 500mm f/4.5 APO EX in particular, and did not like the results. Too soft and too much CA for my taste. I now use a Tamron-F 1.4x adapter and a Kenko Pz-AF 1.5x adapter (I think they are the same optically; externally they are 100% the same) and the results are much better than with the SMC Pentax-F 1.7x AF adapter.
However: I hate TC's in general because they usually screw up the bokeh.
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Peter - Moderator
Pentax K-5 + Pentax 645 + Canon 5D + Bessa RF 10,5cm Heliar, and a 'little' bag full of MF lenses. The lens list is * here *.
My fast 80s: Asahi-Kogaku Takumar 83mm f/1.9 - Super-Takumar 85mm f/1.9 - FA 77mm f/1.8 Limited - Cyclop 85/1.5 (Helios-40 innards) - Komura 80mm f/1.8 - Meyer Görlitz Primoplan 7,5cm 1:1.9 - Carl Zeiss Jena 80mm f/1.8 Pancolar - Canon 85mm f/1.8 S.S.C. - Canon 85mm f/1.2 S.S.C. Aspherical |
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