3dsMax Camera FOV, Focal length and Film Back.

Introduction

This tutorial will shows the relationship between Filmback, Aperture, Field of View, and Lens size.

Understanding the 3dsMax camera filmback is useful if you want to replicate real world cameras or accurately extend the frame size and crop it later in a composite package.

The setup for the 3dsMax camera is slightly buried. To replicate real world cameras we’ll look in two areas: the render dialog and the camera dialog.

To simplify the process I have developed this MaxScript which is free to download here.

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Timecode formula for spreadsheets

Like it or not spreadsheets are just too useful. Having the right formula to hand can really make things easier. Plus for me writing a bit of code serves to alleviate the tedium of data entry.

This expression will calculate the difference between two timecodes and spit out the answer in frames. Each cell must written using 11 characters in the standard timecode format. e.g.    10:23:07:24

This version works at 25 FPS and will subtract the IN point cell ‘G4’ from the OUT point cell ‘H4’.

((MID(H4;1;2)*3600+MID(H4;4;2)*60+MID(H4;7;2))*25+MID(H4;10;2))-((MID(G4;1;2)*3600+MID(G4;4;2)*60+MID(G4;7;2))*25+MID(G4;10;2))

You can change the frame-rate by swapping the 25 for a different number.

How it works

The MID function simply grabs individual characters from a cell.

MID(H4;7;2)

Will grab 2 characters from cell H4 starting with the 7th character in the string.
E.g. It will grab 07 from 10:23:07:24

MID(H4;7;2))*25

07 seconds * 25 fps = 175 frames

HDR Photography Equipment

I take a lot of HDR images for vfx work. I’m on a quest for the perfect setup that’s super fast to use on set. Here’s the HDR photography equipment and software I’m investigating. I’ll add more as I find it.


Everything HDR hdrlabs.com


Control your Canon EOS with your Android device dslrcontroller.com. The specs on this look amazing. Frankly I’m temped to replace my iPad with and Android tablet just to try this out.


Mod your canon dslr firmware using Magic Lantern firmware.

Includes HDR Bracketing for stills and hdr video (which is just nuts frankly)

magic Lantern view


CHDK is a great project for Canon’s Point-and-Shoot cameras. CHDK gets loaded into your camera’s memory upon bootup and is a temporary change to the firmware.

It runs simple Lua Scripts. You can write your own or download them from the community wiki.

Try HDR_Fast_Shooter


Some links for auto bracketing exposures. Using software or remote control http://www.dslrassistant.com/


Control your camera using a scripting language HDRCapOSX


Expensive do everything dslr remote control promote


There’s also OnOne’s dSLR Remote for the iPhone … unfortunately you still need a laptop to connect to your camera and run the software. But it has some useful applications.


trigger Trap

Trigger Trap Produces a bunch of devices and an app for the iPhone that will trigger your DSLR in creative ways using various sensors and timers.

Dumb 3dsMax Tip of the day … lock the camera

Lock 3dsMax CameraSo I’m in 3dsMax. I’ve painstakingly animated a scene for hours and instinctively middle mouse drag to change view. I’ve now accidentally animated the camera… but I don’t notice until an hour later…. arg

Lock the camera before animating your shot.

Select the camera (and Target). Go to the hierarchy panel > link info > locks , and check all the boxes for movement rotation and scale.

and with a bit of MaxScript…

This will lock the transform of the current object selection:-

setTransformLockFlags selection #all

This will lock the transform of all cameras in the scene:-

setTransformLockFlags cameras #all