I haven't seen anyone posting this and having discussions about it so here goes.

If you have the time, it's a good video explaining on crop factors.
Don't forget to apply it to your ISO and aperture as well.


Bonus.


This post has been edited by Jackie-Cham: Jun 8 2014, 05:27 AM

a debate that does not help one improve photography.

I don't even know how he could even devide ISO 3200 by 4 to ISO 800 when ISO 3200 to ISO 800 is 2-stops of light intensity.

He's trying to get the same bokeh out of it so of course there'll be difference from crop factors due to how the light lands on the sensors.

In short - this video has sprout so many useless discussions that don't help people take better picture.

It's actually very simple, take a LIGHT METER (eg those from Sekonic) and get the readings for the scene you want. You can set your Medium Format / FF / APS-C / M43 / Whatever camera you have to the settings given, the exposure will be almost the same, variance here and there would be due to the T-stop of the lens (T-stop, yes, not F-stop).



oh btw - it's a bad video explaining crop factors.

If you watch the video you'll know that he's trying to say manufacturers are falsely advertising their products.
The info and such is the opening to his main point.
The way he explains also help a lot.

which isn't true at all, i have seen this video getting discussed at a few big photography pages (slrlounge or fstopper i forgot and also some other people sharing it). the problem is, a f2.8 will still be f2.8 regardless the sensor size. a phone sensor with the exact aperture and shutter speed + iso will produce the same result as a FF with same settings.

it's not that a f2.8 on a m43 is f5.6, it's just the amount of DOF the m43 produced is only 1/2 to what FF produces. imagine cropping a f2.8 picture, will the picture become darker at the end/ the exposure change? no, because it only crops the image, same with smaller sensor.

However, cropping an image from a f2.8 FF does not give you the same result as shooting it with the m43.
It's like he said in the video, you still have to compensate something else to achieve the same results.
But there are limitations to start you can achieve on a smaller sensor compared to a FF, for one it will never get the same DOF even if they're both f2.8.

If you have no knowledge, you will still continue believing that he's right.

There will be no way to convince you, it's entirely up to you how you want to think.

Just need to understand the logic of aperture vs sensor size (hence how light falls) and you'll see what he's talking is nonsense.

You can go all the discussions that are around for the past months.

Those who know their stuff don't talk about it
Those who focus on art don't talk about it.
The people who actually continue talking about are often newbies that don't know their stuff nor know art, everything spouted by the fella also seems convincing.

I guess I will look deeper into it.
It still doesn't explain how they don't put the crop factor into the aperture if they include it in the focal length.

Don't waste time into this.

If you want to spend time in photography, go learn up how to take better pictures, improving post-processing and streamlining post-production workflow. Go learn about lighting and posing as well. Learn how to print, how to adjust your photos for print, and how to print on various types of paper. Learn how to interpolate your photos to cater for larger prints.

Wasting time on these kind of nonsense is unfathomable.

I put it simple to you. Take a Canon EF 50mm f1.8 lens.

You put on APS-C or FF - set it to f/4 | 1/400 | ISO 400 and the exposure will be the same. Only difference would be the DOF.

Note - I mentioned DOF, not BOKEH because Bokeh is a direct result of DOF.

It's all about how the light falls on the sensor, that's it. The fella just take simple thing made complex.

He couldn't even get the ISO number correct at 15:33. ISO 800 with 2 stops increased sensitivity is ISO 3200, not 3600. LOL when he say that smaller sensors having same DOF and same FOV.

Like I said, a light-meter and meter a particular scene. If the light meter gives you a setting, it'll work the same across all camera systems regardless Medium Format / FF / APS-C / M43 / Phone.

The fact that he has to adjust another value to compensate over another setting change to me is enough to prove that what he talks is nonsense.

And if my most technically knowledgeable contacts don't make a fuss about this video, it can be ignored.

I agree.. a total wast of time.. killed the vide midway.. waste of my time. Go take more photo!!

i killed the video at 41 secs...

don really understand he can say ISO and Aperture is affected by crop factor

the DOF bit is known la

edit:
did a bit of further reading... i think he is just saying to achieve the same DOF.. u need to adjust ur aperture..... it has nothing to do with metering...

focal length don change with diff sensor size.. that is all we need to remember...

the ISO bit he mentioned i really confused...

edit:
did a bit more further reading about the ISO bit

i think he is saying if both a FF camera and an APS-C camera (or smaller sensor) have the SAME amount of pixels, the pixels on the APS-C sensor will be smaller hence each pixel receive less light...

Analogy: catching rain water with cups... for FF, u can use bigger cups... for APSC, u can only use smaller cups... assuming u r allowed the same number of cups to fill up the area..

the argument also holds true for a 38mp D800 and a 16mp D4... both FF cameras......

i dunno how he drag crop factor into this....

Goldfries is right... this video really confuses the hell out of newcomers.... just avoid it and go take more pictures..

This post has been edited by seather: Jun 12 2014, 02:53 PM

Jackie-chan, you are badly mislead by that video. he totally MISGUIDE ppl to Pro-CROP in a very Pro way... actually more or less same with a brainwashing workshop by olympus 3 years back i joined...

how he mislead... he is trying to tell u the disadvantage that FF had to archive what crop's DOF. (slightly factual) but he never actually teach u how to gain FF DOF from Crop, which, Cannot be done in any way. this is where he left out, hence u get mislead by his point that FF suffer isoboost to gain DOF by increasing aperture. exactly same as what the stupid(genius) trainer mention in the olympus workshop i went.... he tried to brainwash(teach) all the people more DOF is better then shallow DOF which olympus suffer. turning their weakness to strength. uhuhuhuhuh


*edit: What the video teach IS TRUE. but that doesnt mean FF is bad vs Crop. some people need more DOF, then of coz, APSC or M4/3 is a better choice. but most ppl love the crazy shallow DOF, then FF is a much fun(and affordable) camera to play with....

This post has been edited by edpaul: Jun 12 2014, 10:41 PM