hi, i have a portrait photo with all information about camera and lens , so how i can do right setting for perspective (angle of view) from reference photo in zbrush 4r7
I think Zbrush camera is rather fake and you don’t have a exact translation to real cameras.
The distortion of the camera in real life is also related to distance and then it is important to know the size of the objects.
In general for heads a good reference is to see how much the ears disappear. When less visible, the wider lens. A good portrait should avoid lenses below 80mm or the distortion will give unrealistic faces with noses bigger that are in real life. Also becomes more complex to avoid error in Zbrush as proportions change depending of the angle a lot.
In Draw you have a setting called angle of view that should allow you to change the FOV. Lower values means less distortion and a longer lens, higher values are wider lens.
The units are represented in FOV angle of view in ZBrush. There are numerous webs that translate that to mm lens. For example, 10 degress should be 200mm, 40 degress should be 50mm etc. Not sure how accurate is this in Zbrush.
In Older versions of Zbrush the perspective was changing when local mode was chosen, but it doesn’t seem to happen any more.
thank you for answer 
can you give me that websites wich convert mm lens to zbrush angle?
i have a canon 7D mark ii + 18-135 lens , it is a 67mm lens
but in different zoom i grab different mm !
and what focal length good for this camera ?
sorry for bad english
I think your camera has a crop factor of 1.6
I have found a couple. The first one is simple but only accepts a crop factor of 1.5, that is a OK approximation:
http://kmp.bdimitrov.de/technology/fov.html
The other one accepts any crop factor but it is quite complex
http://www.scantips.com/lights/fieldofview.html
You have also a crop factor calculator where you can calculate the real mm of your camera and then use the first link without crop factor
https://www.digified.net/focallength/
This is simply from a google search, probably there are more.
The best mm depends of the subject and artistic intention. All range of your lens is good, it depends what is for. For portraits as I said anything below 80mm is generally no good, the subject will look goofy. Normally 100 to 120 is the most common for portraits. Too long lens will make the face look too wide but your lens won’t have that problem as they are not that long.
Not sure if I’m wrong but using the calculator you need to be in the top of your range in order to be able to use it as portrait, I mean basically 135mm in your lens will give real 85mm (more or less)
https://www.digified.net/focallength/
85mm will be 28.5 FOV, that would be what you need to set in Zbrush in Draw>angle of view
http://kmp.bdimitrov.de/technology/fov.html
But anyway Zbrush not necessarily will be accurate with this and you need to have in mind size and distance.
Interesting example of effects of different mm in a face. Be carefull about examples about this is internet as sometimes they crop the image, taking a 50mm with the subject far away and then cropping it. This would give obviously less distorsion and the reference should be a face filling in a reasonable way the frame with the head and neck. A full figure cropped is not a portrait from distorsion point of view.
http://stepheneastwood.com/tutorials/lensdistortion/strippage.htm
i wish the best for you, thank you for guidance