Archived posting to the Leica Users Group, 2014/02/22
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]So has the Fuji X system pretty much been out-wowed by the Sony system? Primarily because Sony is FF vs APS-C? Just curious. The X-T1 is coming, which looks like a great camera, but Leica users here are trending toward the Sony... Just wondering which I should buy next: Seems the Sony for my hard to focus Noctilux and 75/2... Keep using the M for WA (35 & 21) Thanks for any thoughts, Bob Sent from my iPad > On Feb 22, 2014, at 9:13 AM, Steve Barbour <steve.barbour at gmail.com> > wrote: > > >> On Feb 22, 2014, at 8:40 AM, Sonny Carter <sonc.hegr at gmail.com> wrote: >> >> Non native lenses are really easy to focus with the A7r. There's a color >> indicator that blooms as areas are in focus. (you can change the color of >> the bloom) > > > one approach is to shoot in RAW and jpeg fine bw and set the focus peaking > color to red.... > > so you see in bw and the red "bloom" is incredibly sensitive and easy to > see, when you are in focus. > > > s > > >> >> >> >> >> On Sat, Feb 22, 2014 at 10:13 AM, Frank Filippone <red735i at >> verizon.net>wrote: >> >>> Certainly during focusing, there is little computing going on other than >>> focus and metering... so certainly there is power available to do more >>> extensive focusing operations.... >>> >>> Until someone hacks the FW, I doubt we will know much more..... >>> >>> I was just shocked about focusing at shooting aperture.... he last time I >>> HAD to do that was in the 60's, when my long 400mm f8 lens did not have >>> auto >>> aperture, and shooting sports was nearly impossible with the preset >>> aperture >>> rings.... With AF, it is a different animal all together.... >>> But I really wonder to what advantage there is to native lenses when you >>> have an EVF that takes care of finder brightness, and AF that for native >>> lenses is done at shooting aperture... It seems to be the same if you >>> were >>> to use non-native lenses... With the exception of AF itself......... >>> >>> Frank Filippone >>> Red735i at verizon.net >>> >>> >>> -----Original Message----- >>> From: lug-bounces+red735i=verizon.net at leica-users.org >>> [mailto:lug-bounces+red735i=verizon.net at leica-users.org] On Behalf Of >>> Sonny >>> Carter >>> Sent: Saturday, February 22, 2014 7:22 AM >>> To: Leica Users Group >>> Subject: Re: [Leica] OT - Sony Alpha 7R >>> >>> I was thinking about the event on the FE lenses where they focus at >>> working >>> aperture, and at focus, they open about a half stop during the AF portion >>> of >>> the program. >>> >>> Perhaps the camera compares the different depth of field at each >>> aperture >>> to determine final calibration? Most of the details needed to calibrate >>> the >>> lens might be stored in the lens' chip at manufacture. >>> >>> Judging from what I can see in the viewfinder when I have all the info >>> turned on, the camera is capable of considerable computing power. >>> >>> >>> >>> >>> On Sat, Feb 22, 2014 at 8:57 AM, Frank Filippone <red735i at verizon.net >>>> wrote: >>> >>>> The camera is open loop.... meaning that there is no comparison upon >>>> which to base a standard for what is in focus during calibration. In >>>> real world terms, your eyes and brain decide what is actually in >>>> focus. So the camera, by itself, would not be able to do the >>>> calibration. ( why there really is a fine focus adjust feature in >>>> higher end cameras.. camera AF is adjusted by the user to nail down >>>> the precise focus location. >>>> >>>> If you used a computer and factory "machines" to do the calibration, >>>> it would be relatively trivial to imbed the calibration data into the >>>> lens ROM and have the camera access that info, perform modification to >>>> the camera to produce "correct" focus .... if the camera is >>>> calibrated.... which, even in the case of Leica, is not always >>>> correct.... >>>> >>>> In truth, the idea is a good one.... but requires the manufacturer to >>>> calibrate each lens and embed the error-correcting-calibration, and >>>> each camera body to a standard....and then to design FW to allow the >>>> access and use of that data..... Read all of that as extra cost, and >>>> you get an idea of why it has not been done yet.... >>>> >>>> If you go to the Sigma site, and read about their whoopee doo new >>>> lenses ( I think they are the ART lenses), you will read about a >>>> little gadget that allows each AF lens + camera to have its errors >>>> embedded into the lens for correction upon use..... The customer gets >>>> to do the work..... Cost is pretty mild, work time is a few minutes >>>> per lens... It is pretty close to your suggestion.... >>>> >>>> Frank Filippone >>>> Red735i at verizon.net >>>> >>>> >>>> -----Original Message----- >>>> From: lug-bounces+red735i=verizon.net at leica-users.org >>>> [mailto:lug-bounces+red735i=verizon.net at leica-users.org] On Behalf Of >>>> Sonny Carter >>>> Sent: Friday, February 21, 2014 10:58 PM >>>> To: Leica Users Group >>>> Subject: Re: [Leica] OT - Sony Alpha 7R >>>> >>>> So how can you know how it doesn't do it and not know how it does it >>>> at the same time? ;-) >>>> >>>> Sent from my iPhone >>>> >>>> Sonny Carter >>>> http://www.SonC.com/look >>>> >>>> >>>>> On Feb 21, 2014, at 11:56 PM, "Frank Filippone" >>>>> <red735i at verizon.net> >>>> wrote: >>>>> >>>>> You would need a reference calibration somewhere...and to be honest, >>>>> the camera does NOT know what is actually in focus and what is not.... >>>>> it only knows what should be in focus.... it is an open loop system.... >>>>> >>>>> Would you like to sit there at every F stop (and FL for a zoom) and >>>>> calibrate the focus shift for every combination? >>>>> >>>>> This is a factory calibration, not a user calibration >>>>> >>>>> Frank Filippone >>>>> Red735i at verizon.net >>>>> >>>>> >>>>> -----Original Message----- >>>>> From: lug-bounces+red735i=verizon.net at leica-users.org >>>>> [mailto:lug-bounces+red735i=verizon.net at leica-users.org] On Behalf >>>>> Of Sonny Carter >>>>> Sent: Friday, February 21, 2014 9:49 PM >>>>> To: Leica Users Group >>>>> Subject: Re: [Leica] OT - Sony Alpha 7R >>>>> >>>>> Couldn't the camera calibrate the lens? After all, it is an optical >>>>> computer; what is one more task added? >>>>> >>>>> Sent from my iPhone >>>>> >>>>> Sonny Carter >>>>> http://www.SonC.com/look >>>>> >>>>> >>>>>>> On Feb 21, 2014, at 11:37 PM, "Frank Filippone" >>>>>>> <red735i at verizon.net> >>>>>> wrote: >>>>>> >>>>>> That would require calibration of each lens ( maybe they all act >>>>>> the same????)... >>>>>> >>>>>> I would think of this as a really good idea, but I also thought a >>>>>> R10 was a really good idea...... >>>>>> >>>>>> Frank Filippone >>>>>> Red735i at verizon.net >>>>>> >>>>>> >>>>>> Frank Filippone wrote: >>>>>> >>>>>>> >>>>>>> If you are focusing at working aperture, what advantage is there >>>>>>> to native lenses? >>>>>>> >>>>>>> I'm not so sure Sony has this thought out...... >>>>>> >>>>>> For those who are interested in such things, native-mount lenses >>>>>> will allow shutter-priority and program exposure modes, and AF. >>>>>> >>>>>> Another way to handle focus shift would be to program the lens to >>>>>> tell the camera how much shift there is at various apertures. >>>>>> Given this would be a native-mount lens the camera would know what >>>>>> aperture the lens will be using. >>>>>> >>>>>> Doug Herr >>>>>> Birdman of Sacramento >>>>>> http://www.wildlightphoto.com >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> Leica Users Group. >>>>>> See http://leica-users.org/mailman/listinfo/lug for more >>>>>> information >>>>> >>>>> _______________________________________________ >>>>> Leica Users Group. >>>>> See http://leica-users.org/mailman/listinfo/lug for more information >>>>> >>>>> >>>>> _______________________________________________ >>>>> Leica Users Group. >>>>> See http://leica-users.org/mailman/listinfo/lug for more information >>>> >>>> _______________________________________________ >>>> Leica Users Group. >>>> See http://leica-users.org/mailman/listinfo/lug for more information >>>> >>>> >>>> _______________________________________________ >>>> Leica Users Group. >>>> See http://leica-users.org/mailman/listinfo/lug for more information >>> >>> >>> >>> -- >>> Regards, >>> >>> Sonny >>> http://sonc.com/look/ >>> Natchitoches, Louisiana >>> 1714 >>> Oldest Permanent Settlement in the Louisiana Purchase >>> >>> USA >>> >>> _______________________________________________ >>> Leica Users Group. >>> See http://leica-users.org/mailman/listinfo/lug for more information >>> >>> >>> _______________________________________________ >>> Leica Users Group. >>> See http://leica-users.org/mailman/listinfo/lug for more information >> >> >> >> -- >> Regards, >> >> Sonny >> http://sonc.com/look/ >> Natchitoches, Louisiana >> 1714 >> Oldest Permanent Settlement in the Louisiana Purchase >> >> USA >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information