Archived posting to the Leica Users Group, 2014/02/22
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]If AF focus is done at working aperture, there is no lens focus shift apparent to the user or the camera system.... Therefore there is no review stating there is focus shift... Try the lens on MF, with focusing done wide open, then you would see the focus shift.... Since these reviewers all want to see the extent of the AF capabilities, they will not perform the test that gives you the un-corrected (MF) result... It is a pretty awesome strategy.... although I still contend that there is an issue about DOF and precise focusing... how big it is, is still TBD..... 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 mehrdad Sent: Friday, February 21, 2014 6:39 PM To: Leica Users Group Subject: Re: [Leica] OT - Sony Alpha 7R hi paul here is another review of the 35mm fe and no mention of focus shift http://slrgear.com/reviews/showproduct.php/product/1657 ------------------------------------- regards, mehrdad On Wed, Feb 19, 2014 at 10:57 AM, Paul Roark <roark.paul at gmail.com> wrote: > Yes, the 75 Summarit does very well. Get the Novoflex adapter. The > others don't cut it. > > One other irritating issue with the a7r -- I think the 35 mm FE > focus-shifts. That may be one reason why they use focusing at the > stopped down aperture. The 35 has no physical infinity stop (probably > due to this), and that is a bit of a pain. > > Manual focusing with magnification works best stopped down, but the FE > at > 2.8 does an amazing job of AF. It even seems to balance the field > curvature into the point it selects; I can't touch it with manual focusing. > However you can't then stop down and expect a sharp image. Very > interesting. > > The camera software and hardware, as design elements in an overall > computer balancing of performance may be really starting to show what it can do. > > On the plus side, the Sony has focus distance read-outs in the finder. > So, I can do multi-zone focusing without removing my eye. The > resulting focus stacks are much better aligned, with the help also of > grid lines and the level. I know where the infinity focus is. For > this, the system that automatically goes to a magnified view should be > turned off, which is where I leave that setting. > > Magnification as a 2-button (Why not one Sony?) manual process works > best for the way I shoot. I can simply remember the focus points and > watch the scale to get my focus stack. > > Paul > www.PaulRoark.com > > > > On Wed, Feb 19, 2014 at 9:31 AM, Sonny Carter <sonc.hegr at gmail.com> > wrote: > > > Paul, do you mean the 75 2.5 Summarit? Because I just started > > playing > with > > mine on the A7r, and have been floored by the performance. So much > > more than I was able to get out of it with the M8 or M9. > > > > > > On Wed, Feb 19, 2014 at 10:30 AM, Paul Roark <roark.paul at gmail.com> > wrote: > > > > > The Sony a7r is not a perfect camera by any means, but it's good > > > enough that it will be what I take to Italy in a month, leaving > > > the M9 home > (or > > > it'll be a backup camera). > > > > > > The Zeiss 35mm ZE optic for the Sony can easily out-shoot the M9 > > > with > the > > > Zeiss 2.8 Biogon, which was my main lens. The Biogon at it's best > > > on > the > > > Sony is a hair sharper in the center than the FE, but the FE at > > > 2.8 at > > the > > > edge is essentially equal to the Biogon on the M9 at f8. This is > > > quite > > an > > > achievement. It may signal that design of wide angle optics for > > > the specific characteristics of the sensor's micro-lenses is > > > needed. We'll > > see > > > of Zeiss can pull off the same magic when it releases the wider optics. > > > > > > ALL M optics I've tested below 50mm do not work well on the Sony. > > > The edges smear. This is the major disappointment with the > > > camera. The > 75mm > > > Leica 2.8 is amazing on the Sony. So, my 2-lens outfit is the > > > 35mm FE > > and > > > the Leica 75. > > > > > > The Sony auto-iso is not as adjustable as I'd like, but I leave > > > the > > camera > > > on Manual with auto ISO. There the only issue is that the ISO > > > does not show until I tap the shutter button. But, for control we > > > need to see > all > > > three exposure variables -- f-stop, shutter speed, and iso -- in > > > the viewfinder on a continuous basis. > > > > > > Vibration has been a big issue for some, but for hand holding, it > > > does > > not > > > appear to be very significant. Hands absorb the vibration very well. > > > > > > The Sony is no Leica in terms of smoothness or speed of focusing. > > > Sony > > has > > > also clearly not matched the M9 in the micro-lens edge performance > > > for > RF > > > optics. Also, the higher the MP count is, the worse the problems > > > of > ray > > > angle appear to be. It may be the end of relatively symmetrical > > > RF > wide > > > angles. Too bad. On the other hand the optics Zeiss has made so > > > far > for > > > the Sony are amazing. They appear to have found a price/quality > > > point > > for > > > aspherics that allows them to make appropriately priced lenses > > > that can handle high MP sensors. > > > > > > I actual shooting, what I notice the most between the Sony and M9 > > > are > the > > > electronic level in the viewfinder and the superior quality of the > > > Sony metering. The Leica's focusing speed and accuracy are missed, however. > > > > > > The Sony leveling is allowing superior pan stitching of hand held > shots. > > > > > > The Sony meter is sampling 1200 zones. It's essentially automated > > > spot metering -- no need for checking the shot and it's histogram > > > after the fact. You can have a live histogram in the viewfinder, > > > but even where > it > > > seemed to be leaving too much room to the right, it turned out > > > there > were > > > bright spots that would have "burned out" if the shot were given > > > more exposure. The Sony leaves some tiny spectral highlights that > > > are > > "burned" > > > (as appropriate), but even there one can almost always recover > > > some > > detail. > > > At that point you run into the issue that the Sony is compressing > > > the > > very > > > top highlights. Just below total burn-out the CMOS highlights (as > > > with > > my > > > Canons) do not seem to be as good as the M9's CCD near-spectral > > highlights. > > > > > > It's not the ultimate camera, but the Sony a7r is another clear > > > step forward for landscaper work I do. It's a keeper, but I > > > expect in 3 > years > > > it'll be obsolete. There is still a lot of room for improvement, > > > and > > it's > > > no street/people shooter. > > > > > > Paul > > > www.PaulRoark.com > > > > > > > > > On Wed, Feb 19, 2014 at 5:43 AM, Sonny Carter > > > <sonc.hegr at gmail.com> > > wrote: > > > > > > > The A7r is not earth-shattering. It does a nice job shooting my > > Leica M > > > > lenses, Leica R lenses, Nikon F lenses, and of course the native > > > > 35 > > Zeiss > > > > makes real purty pitchurs. > > > > > > > > The camera is sturdy, fairly easy to handle even with my big > > > > paws. I > > > like > > > > the folding screen and live view. It comes to hand real nice. > > > > I've > > been > > > > shooting it since the new year, and almost everything you've > > > > seen > > posted > > > is > > > > from that camera. > > > > > > > > I read Sean's stuff, back when he was a regular guy, not an > > > > expert > you > > > had > > > > to pay to read, and sometimes I agreed with him and sometimes not. > In > > > the > > > > case of corner sharpness, as it applies to my work, well, it > > > > rarely > > does. > > > > Almost everything I do is cropped in some fashion, and even if > > > > it > > isn't, > > > > I'm not wanting you searching out the corners to see how sharp > > > > they > > are. > > > > > > > > At any rate I was pretty happy with shots from my Summilux and > > > > the > 35 > > > > T*. I even put my Leica 21 that Mark hates on it and played with > it. > > > It > > > > was OK. > > > > > > > > In the foregoing graph, I said I was pretty happy with the Zeiss T*. > > > > Actually, I think this camera and this lens were born for each other. > > > > > > > > When I get the swing of them, I think it will feel like I felt > > > > with > my > > M7 > > > > and 35mm Summicron. That, my pals, was awesome. > > > > > > > > > > > > Regards, > > > > > > > > Sonny > > > > http://sonc.com/look/ > > > > Natchitoches, Louisiana > > > > 1714 > > > > Oldest Permanent Settlement in the Louisiana Purchase > > > > > > > > USA > > > > > > > > > > > > > > > > > > > > On Wed, Feb 19, 2014 at 5:47 AM, Gerry Walden > > > > <gwpics at icloud.com> > > wrote: > > > > > > > > > I agree with Nathan that it doesn't look that earth-shattering. > > Having > > > > > read their not-so-favorable conclusions, I was then a little > > surprised > > > to > > > > > read how positive they were in the 'Final Word' section. > > > > > > > > > > Gerry > > > > > > > > > > Gerry Walden > > > > > +44 (0)23 8046 3076 or > > > > > +44 (0)797 287 7932 > > > > > www.gwpics.com > > > > > > > > > > On 19 Feb 2014, at 07:33, Jayanand Govindaraj > > > > > <jayanand at gmail.com> > > > > wrote: > > > > > > > > > > > http://www.dpreview.com/reviews/sony-alpha-a7r/18 > > > > > > > > > > > > Cheers > > > > > > Jayanand > > > > > > > > > > > > _______________________________________________ > > > > > > 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 > _______________________________________________ Leica Users Group. 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