chuhsi1 wrote:
Thanks for all the suggestions to try AFC with center single point. I've always been using 9-point focus (been using that for years) and results haven't always been accurate with this lens. I really noticed this with my 28mm 1.9 so I'm going to work on my focus and recompose.
I have troubles with reds on my macbook. They constantly look blown out even though they are nowhere near blown out on the histogram. My wide gamut monitor should be here soon, but I doubt it will help with reds much....
Hardcore, do you inspect individual channel histogram or Luminosity histogram? I ask this because I notice you add exposure by 0.3 EV, in this case, it mostly like requiring minus exposure.
zhangyue wrote:
Hardcore, do you inspect individual channel histogram or Luminosity histogram? I ask this because I notice you add exposure by 0.3 EV, in this case, it mostly like requiring minus exposure.
Your definitely right... Had 0.3 added by accident on this. I'm looking at both luminosity and color histograms.
Hardcore wrote:
Your definitely right... Had 0.3 added by accident on this. I'm looking at both luminosity and color histograms.
For D800, you might be OK for body like D700, you will blow the red channel for sure.
Camera luminosity histogram will be not helpful in case of RED/ORANGE flower exposure . As you may well over expose your individual channel already.
Here is an example: R/G/B 280/35/80 will give you luminosity of 280X0.3 + 35X0.59 + 80X0.11= 113 so you are well below lum clip point. But RED has been blow up a lot.
For any digital camera, the red usually be problematic it has less weight than Green to contribute exposure evaluation: the camera usually will not wildly over or under exposure Green Chanel. For scene with lots of RED, the camera try to boost exposure level until it reach mid tone at which case red already blow.
I will stop here as not many people enjoy technical discuss but shooting and showing
Hardcore wrote:
I have troubles with reds on my macbook. They constantly look blown out even though they are nowhere near blown out on the histogram. My wide gamut monitor should be here soon, but I doubt it will help with reds much....
Dude... forget about the reds on this image; this is a great example of the sharpness coming out of this lens look at it! just look at the sucker!
Elijah wrote:
Dude... forget about the reds on this image; this is a great example of the sharpness coming out of this lens look at it! just look at the sucker!
i dont know, i think i can get better with my 50mm 1.8D ROFL!
zhangyue wrote:
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.
Sorry for the possible misinformation. I had assumed that if the AF sensor was flat but the lens had a curve in the plane of focus, the peripheral areas are going to suffer if you can only calibrate for one AF sensor (the centre one presumably for most people).
Which kind of correlated to what I'm seeing since there's more back-focusing if I use the peripheral points and require greater AF fine tune compared to the middle point. I'm at about +13 on the middle AF point but haven't really tried to calibrate the peripheral points properly but it would be more than +13.
I'm realising I don't really understand exactly how the AF fine tune works actually.
Actually field curvature varies with focus distance. I also think its quite good at infinity but at MFD its a different story.
Ok.. sorry to have gone down geek street with this post. Here's a smiling baby to make up for it
A few from a recent portrait session. Used my 58 for the bulk of the time, with the 28 to complement it at the wide end. My 85mm never even left my bag.
All shots are wide open except for the flower detail shot (f/2.)
for body like D700, you will blow the red channel for sure. 
look at it! just look at the sucker! 
