Mzigaib Posted October 9, 2015 Share Posted October 9, 2015 (edited) If I try to use a real life measurement for a camera f-stop lets say of 1.5 with with my camera 6M away from the target focus with a aperture of 24.89, according to the houdini's manual this should be a default of a 35mm film, I get a very deep depth of field comparing to a real life camera it seems that f-stop in houdini is not a physical accurate number is that correct? If so is there a way to match it to the real camera's f-stop values? Edited October 9, 2015 by Mzigaib Quote Link to comment Share on other sites More sharing options...
lukeiamyourfather Posted October 9, 2015 Share Posted October 9, 2015 If the subject is 6 meters away that's pretty far which would make the depth of field deeper. Do you have a reference image or an example of what you're looking for? Also what you're getting now? Quote Link to comment Share on other sites More sharing options...
Kardonn Posted October 10, 2015 Share Posted October 10, 2015 If I try to use a real life measurement for a camera f-stop lets say of 1.5 with with my camera 6M away from the target focus with a aperture of 24.89, according to the houdini's manual this should be a default of a 35mm film, I get a very deep depth of field comparing to a real life camera it seems that f-stop in houdini is not a physical accurate number is that correct? If so is there a way to match it to the real camera's f-stop values? Would totally depend on the focal length of the lens. A 135mm lens @ f2 focused 6m is going to have a really thin DoF with only around 15cm of depth actually in focus. A 24mm @ f2 focused 6m is going to have ~5.6m of depth in focus. Also just to make sure you've got the names all right here, the 24.89 is the aperture of Super 35. "35mm film" as we think of it in the context of a DSLR has an aperture of 36. Quote Link to comment Share on other sites More sharing options...
Mzigaib Posted October 10, 2015 Author Share Posted October 10, 2015 (edited) Thanks for the tips guys I'll try to do some tests with those tips I'll let you know. My only question is, since I don't remember seeing anything like this in the manual how did get the number 36 for the DLSR 35mm sensor? Cheers! Edited October 10, 2015 by Mzigaib Quote Link to comment Share on other sites More sharing options...
lukeiamyourfather Posted October 10, 2015 Share Posted October 10, 2015 My only question is, since I don't remember seeing anything like this in the manual how did get the number 36 for the DLSR 35mm sensor? The sensor size on full frame DSLR is 36mm x 24mm which is what 35mm film is (or number 135 film). Houdini is looking at the horizontal size for the aperture. https://en.wikipedia.org/wiki/135_film Houdini default is based on this. https://en.wikipedia.org/wiki/Super_35 Quote Link to comment Share on other sites More sharing options...
anim Posted October 10, 2015 Share Posted October 10, 2015 ... how did get the number 36 for the DLSR 35mm sensor? ... 35mm is width of the film 36x24mm are the dimensions of the frame so width 35mm = 24mm frame width + 11mm perforations Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.