I stand corrected. I appreciate having a reason not to buy it. -----Original Message----- From: Godfrey DiGiorgi <gdigio...@gmail.com> Sender: pdml-boun...@pdml.net Date: Tue, 15 Mar 2011 18:00:57 To: Pentax-Discuss Mail List<pdml@pdml.net> Reply-To: Pentax-Discuss Mail List <pdml@pdml.net> Subject: Re: Pentax glass on m4/3: weird behavior
The hugely expensive Novoflex adapters are only really necessary with Pentax lenses that do not have an aperture ring. They allow manual adjustment of the aperture by providing a secondary ring which moves the iris actuator mechanism, similar to but more flexible than what I used to do with the DA21 and DA70 when adapted to the L1 (I just stuck a little museum putty between the iris actuator and the adapter to set the lens opening I wanted to use). It has nothing to do with AE ... No lens adapter made that I've seen does the auto-iris thing. Auto Exposure is supported with any adapter in aperture priority mode: you set the lens opening you want and the camera sets the shutter speed to match it. Camera's don't need aperture position information to meter correctly that way. On Tue, Mar 15, 2011 at 5:20 PM, Steven Desjardins <drd1...@gmail.com> wrote: > The Novoflex one is the best and lets the AE work: > > http://www.bhphotovideo.com/c/product/646936-REG/Novoflex_MFT_PENT_Pentax_K_to_Micro.html > > Of course, it costs what a lens costs. > > On Tue, Mar 15, 2011 at 8:15 PM, J.C. O'Connell <hifis...@gate.net> wrote: >> seems like it would have to be off by more than 0.36mm for the >> results your getting, something doesn't add up. >> >> -- >> J.C. O'Connell (mailto:hifis...@gate.net) >> Join the CD PLAYER & DISC Discussions : >> http://tech.groups.yahoo.com/group/cdplayers/ >> http://launch.groups.yahoo.com/group/cdsound/ >> >> >> -----Original Message----- >> From: pdml-boun...@pdml.net [mailto:pdml-boun...@pdml.net] On Behalf Of >> Dario Bonazza >> Sent: Tuesday, March 15, 2011 8:05 PM >> To: Pentax-Discuss Mail List >> Subject: Re: Pentax glass on m4/3: weird behavior >> >> >> Let's do some math: >> K bayonet register = 45.46mm >> m4/3 register = 19.25mm >> Then K-m4/3 adaptor must be 45.46 - 19.25 = 26.21mm >> A caliper reads 25.85mm for my adaptor. >> Hence it looks like being 0.35mm short. Is that enough for such a weird >> behaviour? >> >> Dario >> >> ----- Original Message ----- >> From: "Dario Bonazza" <dario.bona...@virgilio.it> >> To: "Pentax-Discuss Mail List" <pdml@pdml.net> >> Sent: Wednesday, March 16, 2011 12:41 AM >> Subject: Re: Pentax glass on m4/3: weird behavior >> >> >>> No name on it, found in ebay from Hong Kong. I bought it some time >>> ago, >>> but I can no longer find trace of that auction. However, it could be this >>> one: >>> >> http://cgi.ebay.com/Pentax-PK-K-lens-Micro-4-3-Adapter-EP-1-GF1-G1-GH1-/2506 >> 30349531?pt=Lens_Accessories&hash=item3a5abba2db >>> >>> Dario >>> >>> ----- Original Message ----- >>> From: "Steven Desjardins" <drd1...@gmail.com> >>> To: "Pentax-Discuss Mail List" <pdml@pdml.net> >>> Sent: Tuesday, March 15, 2011 11:53 PM >>> Subject: Re: Pentax glass on m4/3: weird behavior >>> >>> >>>> I'd like to hear this myself. What brand of adaptor? >>>> >>>> On Tue, Mar 15, 2011 at 6:02 PM, Dario Bonazza >>>> <dario.bona...@virgilio.it> wrote: >>>>> Hello gang, >>>>> >>>>> I've just tried a few Pentax lenses on my Panny GF-1 (via K-micro4/3 >>>>> adapter), just to find a weird behaviour. >>>>> >>>>> With close subjects (inches to meters), the actual distance of my >>>>> subject >>>>> (properly focused by looking at magnified LCD) can be similar to that >>>>> one >>>>> indicated on the distance scale of the lens. However, when trying to >>>>> properly focus at infinity I have to set a much closer distance on the >>>>> lens >>>>> ring, with larger and larger offsets as focal legths shorten. >>>>> >>>>> Examples: >>>>> 100mm lens focused at infinity -> focusing ring is set at 15-20m; >>>>> 50mm lens focused at infinity -> focusing ring is set at 7-10m; 28mm >>>>> lens focused at infinity -> focusing ring is set at 3m! >>>>> >>>>> With a Samyang 8mm fisheye, there's no way to focus (lens helicoid >>>>> has >>>>> no >>>>> run enough to find focus). It happens that by setting the focus at its >>>>> minimum focus distance, the lens is almost (but not yet) focused at >>>>> infinity. By approaching the subject, things become worse. >>>>> >>>>> Have you ever seen anything like that? How would you explain that? >>>>> Wrong adapter? Too short to set proper register distance for >>>>> K-bayonet lenses? >>>>> >>>>> Cheers, >>>>> >>>>> Dario >>> >>> >>> -- >>> PDML Pentax-Discuss Mail List >>> PDML@pdml.net >>> http://pdml.net/mailman/listinfo/pdml_pdml.net >>> to UNSUBSCRIBE from the PDML, please visit the link directly above and >>> follow the directions. >>> >>> >>> ----- >>> Nessun virus nel messaggio. >>> Controllato da AVG - www.avg.com >>> Versione: 10.0.1204 / Database dei virus: 1498/3507 - Data di >>> rilascio: >>> 14/03/2011 >>> >> >> >> -- >> PDML Pentax-Discuss Mail List >> PDML@pdml.net >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> to UNSUBSCRIBE from the PDML, please visit the link directly above and >> follow the directions. >> >> >> -- >> PDML Pentax-Discuss Mail List >> PDML@pdml.net >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> to UNSUBSCRIBE from the PDML, please visit the link directly above and >> follow the directions. >> > > > > -- > Steve Desjardins > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- Godfrey godfreydigiorgi.posterous.com -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
