swifty168 wrote:
Zhangyue: I found this lens has a steeper learning curve than most I\'ve used. Call it imperfections, aberrations, character or whatever you like but it grows on you.
I bought it for the sole purpose of photographing my newborn but I\'ve found it to be a great street and landscape lens too.
I\'ve also found f1.4 at MFD tricky but if you manage to nail focus then the results are superb.
I haven\'t seen this mentioned much but I\'ve found only the centre focus point to be really reliable once I have the focus micro-adjust dialled in. I think this must be something to do with the field curvature. As a result I\'ve even found focus and recompose using the centre AF point a bit better than using the peripheral points which is what I normally do. But more so than any of the other lenses I\'ve used, I\'ve had to limit my composition of close subjects more centrally than usual.
I think the mis focus is mainly because of out side AF point has no as strong process power as center one but not because of field curvature. Field curvature usually require off center focus than focus recompose, as off center is on different plane than center.
Actually, this lens has very minimal field curvature. Shooting at WO infinity, this one is better than any nikon 50ish lens cross frame resolution wise. It still has coma but less than Famous Noct f1.2 Nikon. This lens is originally designed for night photography even in Nikon\'s literature.
Chris Dees wrote:
What kind of AF do you guys use? I\'m having very much problems getting sharp images.
I have a D810 and use most of the the AF-C and Dynamic 9
For long distance say 3M with good light, you might come away with this setting.(As DOF covers it.) But I recommend you use single point AF-C. (AFS for unmoving subject) Lens designed like this has its quirk I think. That f1.8G family is a lot easier task for Camera\'s AF.
Because its poor definition of focus plain,(even at longerish distance, it has resolution, but still low contrast) AF engine is very difficult to decide correct focus plain. With 9 or 21 point, it will cherry picking the better one (more contrast) it thinks. This can be very easy to verify AT LOW LIGHT. Have an object with size cover by 9 or 21 focus point, but having slightly different focus plain, use AF-C, 9 points, focus 10 times with this lens, you can see focus can be random in the zone. DF is behave poor in this test, but D810 also has failed.
I haven\'t verify this myself, but I think this lens may prefer focus from close to far away than other way around, as I usually get back focus once it is mis focused. (I check with my AF fine tune, at +10, it is fine. )
I use a lot manual focus, the basic idea is very similar between AF and MF by eyes. For lens has strong SA, your eyes are hard to decide focusing, at low light, same apply. AF behave the same here.
swifty168 wrote:
Zhangyue: I found this lens has a steeper learning curve than most I\'ve used. Call it imperfections, aberrations, character or whatever you like but it grows on you.
I bought it for the sole purpose of photographing my newborn but I\'ve found it to be a great street and landscape lens too.
I\'ve also found f1.4 at MFD tricky but if you manage to nail focus then the results are superb.
I haven\'t seen this mentioned much but I\'ve found only the centre focus point to be really reliable once I have the focus micro-adjust dialled in. I think this must be something to do with the field curvature. As a result I\'ve even found focus and recompose using the centre AF point a bit better than using the peripheral points which is what I normally do. But more so than any of the other lenses I\'ve used, I\'ve had to limit my composition of close subjects more centrally than usual.
I think the mis focus is mainly because of out side AF point has no as strong process power as center one but not because of field curvature. Field curvature usually require off center focus than focus recompose, as off center is on different plane than center.
Actually, this lens has very minimal field curvature. Shooting at WO infinity, this one is better than any nikon 50ish lens cross frame resolution wise. It still has comer but less than Famous Noct f1.2 Nikon. This lens is originally designed for night photography even in Nikon\'s literature.
Chris Dees wrote:
What kind of AF do you guys use? I\'m having very much problems getting sharp images.
I have a D810 and use most of the the AF-C and Dynamic 9
For long distance say 3M with good light, you might come away with this setting.(As DOF covers it.) But I recommend you use single point AF-C. (AFS for unmoving subject) Lens designed like this has its quirk I think. That f1.8G family is a lot easier task for Camera\'s AF.
Because its poor definition of focus plain,(even at longerish distance, it has resolution, but still low contrast) AF engine is very difficult to decide correct focus plain. With 9 or 21 point, it will cherry picking the better one (more contrast) it thinks. This can be very easy to verify AT LOW LIGHT. Have an object with size cover by 9 or 21 focus point, but having slightly different focus plain, use AF-C, 9 points, focus 10 times with this lens, you can see focus can be random in the zone. DF is behave poor in this test, but D810 also has failed.
I haven\'t verify this myself, but I think this lens may prefer focus from close to far away than other way around, as I usually get back focus once it is mis focused. (I check with my AF fine tune, at +10, it is fine. )
I use a lot manual focus, the basic idea is very similar between AF and MF by eyes. For lens has strong SA, your eyes are hard to decide focusing, at low light, same apply. AF behave the same here.
Mar 16, 2015 at 11:43 AM
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