agencal Posted December 25, 2015 Share #1 Posted December 25, 2015 Advertisement (gone after registration) I have tried 21mm SEM with sony A7x cameras and till f11 corners were awfull becouse of the smearing effect. What abut SL ? I will use it mostly for landscapes and architecture so corner performance is a must. Thank You Link to post Share on other sites More sharing options...
Advertisement Posted December 25, 2015 Posted December 25, 2015 Hi agencal, Take a look here Anybody Tried 21mm SEM with SL ?. I'm sure you'll find what you were looking for!
scott kirkpatrick Posted December 25, 2015 Share #2 Posted December 25, 2015 I've been meaning to do this, so here are two examples that I just shot. I've used the SEM21 extensively on an M9 and an M[240]. I find it is sharpest across the field at f/5.6, so here are shots at f/5.6 on my SL. First, distant stuff L1000735 by scott kirkpatrick, on Flickr where I focused on the near end of the first building, behind the digging machinery. The M-T adapter is apparently (and perhaps intentionally) a little thin, so infinity comes out to be about 10-15 m on the scale. Then a shot focused at about 3-4 m: L1000726 by scott kirkpatrick, on Flickr focus was on the edge of the coffee table, I suspect. Corners are pretty good, almost perfect. The M[240] can do just a tiny bit better. You can see 100% originals on my Flickr archive by clicking through. scott Link to post Share on other sites More sharing options...
agencal Posted December 25, 2015 Author Share #3 Posted December 25, 2015 Thank you Scott. It really helped. Link to post Share on other sites More sharing options...
gpwhite Posted December 25, 2015 Share #4 Posted December 25, 2015 I found excellent results, including into the corners, with my Elmarit-M 21mm ASPH on SL. Using center-weighted metering on aperture priority (both cases), the SL seems to me to protect highlights better than the M240. Link to post Share on other sites More sharing options...
thighslapper Posted December 25, 2015 Share #5 Posted December 25, 2015 I have tried 21mm SEM with sony A7x cameras and till f11 corners were awfull becouse of the smearing effect. What abut SL ? I will use it mostly for landscapes and architecture so corner performance is a must. Thank You I tested a lot including this here ...... http://www.l-camera-forum.com/topic/252842-m-lens-performance-on-the-sl/page-6?do=findComment&comment=2929734 corner performance poor at <1m but it was never designed for close use I don't think you will have any complaints for what you intend ..... Link to post Share on other sites More sharing options...
thighslapper Posted December 25, 2015 Share #6 Posted December 25, 2015 I've been meaning to do this, so here are two examples that I just shot. I've used the SEM21 extensively on an M9 and an M[240]. I find it is sharpest across the field at f/5.6, so here are shots at f/5.6 on my SL. First, distant stuff L1000735 by scott kirkpatrick, on Flickr where I focused on the near end of the first building, behind the digging machinery. The M-T adapter is apparently (and perhaps intentionally) a little thin, so infinity comes out to be about 10-15 m on the scale. Then a shot focused at about 3-4 m: L1000726 by scott kirkpatrick, on Flickr focus was on the edge of the coffee table, I suspect. Corners are pretty good, almost perfect. The M[240] can do just a tiny bit better. You can see 100% originals on my Flickr archive by clicking through. scott a 0.9mm shim between the two halves corrects this if you find it a nuisance ....... of course you will then have no leeway if you have a badly calibrated lens ....... although I have yet to have a problem with any of mine since I modified the adapter. Link to post Share on other sites More sharing options...
mdemeyer Posted December 28, 2015 Share #7 Posted December 28, 2015 Advertisement (gone after registration) Are you sure it needs a 0.9mm shim? That seems like a lot and I'd expect the adapter being that far off to seriously compromise the performance with floating element lenses which require the focus to be where it expects to be for the FLE compensation to be correct. Michael Link to post Share on other sites More sharing options...
thighslapper Posted December 31, 2015 Share #8 Posted December 31, 2015 oops ...... missed a zero ...... ..... 0.09 - 0.1mm works fine ...... has taken me ages to find my original post about this ..... it was a long time ago http://www.l-camera-forum.com/topic/233447-infinity-calibration-with-manual-lenses/?do=findComment&comment=2694386 Link to post Share on other sites More sharing options...
wlaidlaw Posted December 31, 2015 Share #9 Posted December 31, 2015 I just hope that Leica get the PL adapter right or make it easily "shimmable". Accurate scale focus is important for serious video use. If you dial up say 14 feet on a cine lens, you expect it to be in perfect focus at 14 feet not 13.5 or 14.5. It was common for the street in which my office was in London (Folgate Street, E1) to be used for making period movies. I sometimes saw either the Cooke Optical van or the Arri-Zeiss trailer truck on location for servicing the lenses and collimating them to perfect scale focus. I managed to talk my way into the Zeiss truck on the basis that I was a Contax equipment beta tester. You had to put on Tyvek overalls, overshoes and hat to keep dust out but then it was fascinating to see an expert at work, stripping down one lens to get some dust out of it and collimating another lens, which was done on a computerised laser optical bench. I understand that Cooke still use striped targets at various distances rather than a laser Link to post Share on other sites More sharing options...
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