jake123

From wt I've read many ppl agree a 50mm lens would be nice for portraits for crop cameras. The Sony 50mm is not that good for its price but it should do the job. Check out its review at www.photozone.de

jake123

Having nice out of focus effects requires a lot of skills (which I don't have) like the distance between background and subject, less "busy" background, etc..........

jake123

原帖由 daimo 於 2008-7-24 14:01 發表
The longer the focal length and the larger the aperture the more shadow the DOF, i.e. more blurred backgroud.

In other words, if you use a wide angle then it is much harder to achieve blur background ...

And also the closer you focus, the less depth of field(which is the problem he/she is experiencing - full body portrait too much dof, half body shallow enough dof.

jake123

原帖由 daimo 於 2008-7-19 14:03 發表
It's not just the crop factor that matters ... a model taken by a 50mm vs a 85mm vs a 135 mm vs a 200mm, even if you use PS to crop it down to the same size, the pictures won't look the same.

Other than deeper depth of field(about one stop more for crop?) and the characteristics of the lenses themselves, what are the differences?

jake123

原帖由 kisstherain 於 2008-7-28 20:16 發表


What is "one stop more for crop"?

By that I just meant you should get around same depth of field if you close the aperture down one stop. I have no idea how true that is now that you've asked.

jake123

原帖由 daimo 於 2008-7-29 09:37 發表


what I was trying to say, simply:

If I compare a 50mm with a 1.5x camera vs a 75mm (ok, assume there is such a model) with a full frame camera,

Although they will have the SAME crop ratio, but du ...

Well but wt I've read from some books is like you take the ideal perfect 14mm lens and the perfect sensor/film and then you crop, say a 50mm field of view, then you will the same perspective as if you were using a 50mm lens. Please correct me if I am wrong. I'm just a beginner.


SB: Yea I should have said "apparent" depth of field.

jake123

原帖由 daimo 於 2008-7-29 17:56 發表
What you read from those books is not true.  I suggest you take a look at the Kodak professional guide for photography.  

Jake, pardon me for being too lazy to explain, but you can do a test with a z ...

Thanks, I will do my own experiment.

[ 本帖最後由 jake123 於 2008-7-29 18:19 編輯 ]