Episode 72: MoviePass vs. AMC Stubs A-List

For less than the cost of one movie ticket, MoviePass lets you see up to three movies per month in theaters. AMC Theatres is now competing with their own monthly movie plan. Plus, your questions about calculating SD card recording time, lav mics for four people, and how to backup footage while climbing a mountain.

Emily asked about backing up footage in the wilderness, without laptops or internet. Episode 63 of this podcast discusses some hardware options, and the LaCie 2TB DJI Copilot BOSS may be the ideal choice.

Obi asked for lens recommendations for event videography. Nick and I like the combination of the 12-35mm and 35-100mm, both f/2.8 constant. Both lenses appear in my equipment list.

Blake asked about this SanDisk 64GB SD card. Its label says 95MB/s, but 95 megabytes per second is the read speed, not the write speed. It’s a V30 card, meaning it can guarantee a sustained 30MB/s write speed for video recording. 30 megabytes is 240 megabits, so it can handle recording quality up to 240mbps.

To figure out recording time, you need to know that:

There are 8 bits in a byte, therefore 8 megabits (mb) in one megabyte (MB).
And there are 1024 megabytes (MB) in a gigabyte (GB).

GB * 1024 * 8 / bitrate / 60 seconds = the number of recording minutes.

If I’m shooting 150mbps on my GH5 with a 64BG card, I can record 58 minutes of video, according to this formula: 64 * 1024 * 8 / 150 / 60 = 58.25

Griffin HammondJuly 25, 2018