Originally posted by audiobomber I'm not sure what point you are trying to make. The OP is trying to understand bridge cam specs, which are deliberately fashioned by marketers to confuse people. That is mainly what the Tony Northrup video is about.
He is certainly technically correct as it relates to DOF, but 2.8 lets in light at the same rate whether it's on a bridge cam or a large format view cam. So your exposure triangle follows the what the marketers are touting, your DOF does not. ISO 100, F2.8, 1/500 sec all give the same exposure irregardless of the format.
And then there is the fact that some people, as crazy as it sounds, don't like to take 10+ kg of photo gear on a trip with them as it rather ruins the fun.
This person now primarily shoots with a Leica V-Lux 4 aka Panasonic FZ200
Barbara & Stu's Excellent Vacations
This guy doesn't like to carry much either
https://www.flickr.com/photos/peteshep/with/9490548930
It's a convenience vs quality trade off. One has to determine where they are on the continuum. A Panasonic FZ200, Sony RX100, Canon SL1 with 18-135, and a Nikon D800 with the trio of 2.8 zooms. All are chosen by travel photographers and are all competent cameras for travel. Personally, you could not pay me to haul a D800 and the trio on a trip, but then I know some of you would refuse to go if you couldn't take it. I could go with a DF and 50mm. It's individual preference.
---------- Post added 06-08-14 at 15:21 ----------
Originally posted by jogiba Showing that a full frame with slow F3.5-5.6 24-200mm zoom is much faster than cameras with much faster 24-200mm FF eqiv. f2.8 zooms and smaller (1") sensor.
Much faster in what way? The smaller censored camera shot at 2.8 will be able to maintain a faster shutter speed at any ISO than the full frame will. A 2.8 is a 2.8 is a 2.8, if by speed we mean rate of light falling on the sensor. Whether that sensor is the size your thumb or your hand does not matter, lens size will account for that. One just has a bigger bucket to fill to make a particular exposure.
Northrup ought to be complaining that the full frame marketers aren't telling us the whole story after all a 24 - 200 2.8 on full frame would be 180 - 1504 f/21.1 on 8x10