Not sure how to put it, I guess luminosity? Basically, with the two setups, assume one is exposed correctly to get a nicely lit image, the other will have the same.

...in exposure, if any, between f/2.8 1/200 ISO 100 and f/2.8 1/800 ISO 400, if any at all? If there is a difference, why is one preferable to the other?

Hint: there's a significant difference between exposure (the density of light falling on the sensor), the total amount of light that falls on the sensor, and the brightness at which the photo is displayed. When you understand the differences between these measures, then all will make sense.

This might help:

http://www.josephjamesphotography.com/equivalence/#exposure

To Gear Bustard from Great Grins:

Two cameras side by side aimed at the same subject at the same time

Camera 1: FF sensor, 50/2.8 lens ISO=100 F=2.8 S=1/200

Camera 2: 43 sensor, 25/2.8 lens ISO=100 F=2.8 S=1/200.

Question: is one of the cameras underexposed?

No hints, and no help provided, just you and to cameras side by side aimed at the same subject

--
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Post (hide subjects)	Posted by	When
Light gathering in M43 vs FF	Peng Bian	6 months ago	1
Re: Light gathering in M43 vs FF	pgilland	6 months ago
Re: Light gathering in M43 vs FF	Peng Bian	6 months ago
Re: Light gathering in M43 vs FF	pgilland	6 months ago	5
Re: Light gathering in M43 vs FF	Promit	6 months ago	4
Re: Light gathering in M43 vs FF	Thomas_A	6 months ago
Re: Light gathering in M43 vs FF	DonParrot	6 months ago	1
All wrong!!!	eques	6 months ago
Re: All wrong!!!	Dr_Jon	6 months ago
Re: All wrong!!!	Dr_Jon	6 months ago
Trying to make sense.	eques	6 months ago
Re: All wrong!!!	bobn2	6 months ago	4
See Klarno and Much-having-fun	eques	6 months ago
Re: Light gathering in M43 vs FF	s_grins	6 months ago	3
Re: Light gathering in M43 vs FF	Peng Bian	6 months ago
Re: Light gathering in M43 vs FF	s_grins	6 months ago	3
Light and luminosity aren't necessarily the same thing	noirdesir	6 months ago
Tell me, Peng, what is the difference...	Great Bustard	6 months ago	1
Re: Tell me, Peng, what is the difference...	s_grins	6 months ago
Re: Tell me, Peng, what is the difference...	noirdesir	6 months ago
Re: Tell me, Peng, what is the difference...	s_grins	6 months ago
Re: Tell me, Peng, what is the difference...	noirdesir	6 months ago
Re: Tell me, Peng, what is the difference...	s_grins	6 months ago
Re: Tell me, Peng, what is the difference...	noirdesir	6 months ago
Re: Tell me, Peng, what is the difference...	s_grins	6 months ago	1
Re: Tell me, Peng, what is the difference...	noirdesir	6 months ago
Re: Tell me, Peng, what is the difference...	s_grins	6 months ago
Re: Tell me, Peng, what is the difference...	noirdesir	6 months ago
That's exactly it!	Great Bustard	6 months ago	2
Re: That's exactly it!	maoyama	6 months ago
Re: That's exactly it!	exdeejjjaaaa	6 months ago
Re: That's exactly it!	Ulric	6 months ago
Re: That's exactly it!	exdeejjjaaaa	6 months ago
Re: That's exactly it!	bobn2	6 months ago	1
Re: Saturation ISO, SOS, and REI (from ISO 12232, published 2005)	Detail Man	6 months ago	4
Re: That's exactly it!	exdeejjjaaaa	6 months ago
Re: That's exactly it!	Great Bustard	6 months ago
Re: That's exactly it!	bobn2	6 months ago	2
Re: That's exactly it!	eques	6 months ago
Re: Tell me, Peng, what is the difference...	bobn2	6 months ago	2
Re: Tell me, Peng, what is the difference...	s_grins	6 months ago
Re: Tell me, Peng, what is the difference...	bobn2	6 months ago	2
Re: Tell me, Peng, what is the difference...	richarddd	6 months ago
Re: Tell me, Peng, what is the difference...	bobn2	6 months ago
Re: Tell me, Peng, what is the difference...	s_grins	6 months ago
Re: Tell me, Peng, what is the difference...	bobn2	6 months ago
Re: Tell me, Peng, what is the difference...	Anders W	6 months ago
Re: Tell me, what is the difference ...	Detail Man	6 months ago
Re: Tell me, what is the difference ...	Anders W	6 months ago
Re: Tell me, Peng, what is the difference...	noirdesir	6 months ago
Re: Tell me, Peng, what is the difference...	s_grins	6 months ago
Re: Tell me, Peng, what is the difference...	Anders W	6 months ago
I have an answer for you. Now it's your turn.	Great Bustard	6 months ago
Re: I have an answer for you. Now it's your turn.	s_grins	6 months ago
Re: I have an answer for you. Now it's your turn.	Great Bustard	6 months ago
Re: I do not discuss with Bustard.	s_grins	6 months ago
Your hypocrisy knows no bounds.	Great Bustard	6 months ago
Re:Sure! Exposure/ISO deniers deserve a camera without aforementioned controls	s_grins	6 months ago
Still "not discussing", eh?	Great Bustard	6 months ago
Re: Your hypocrisy knows no bounds.	zxaar	6 months ago	2
Re: Your hypocrisy knows no bounds.	Great Bustard	6 months ago
Give it a rest s_grins :)	Beach Bum	6 months ago
Re: Light gathering in M43 vs FF	Klarno	6 months ago	7
F/1.4 = F/1.4 on all cameras	Just Having Fun	6 months ago	3
Re: F/1.4 = F/1.4 on all cameras	Peng Bian	6 months ago
Re: F/1.4 = F/1.4 on all cameras	tt321	6 months ago	3
Re: F/1.4 = F/1.4 on all cameras	SphericalAberration	6 months ago	1
However, exposure is irrelevant in cross-format comparisons.	Great Bustard	6 months ago
Nonsensical response	Beach Bum	6 months ago
Total light doesn't tell you anything about sensor performance	Andy Crowe	6 months ago
Re: Total light doesn't tell you anything about sensor performance	Great Bustard	6 months ago
Re: Total light doesn't tell you anything about sensor performance	noirdesir	6 months ago
Yes......	tedolf	6 months ago	2
Re: Yes......	Peng Bian	6 months ago
Well then......	tedolf	6 months ago	2
Re: Well then......	Peng Bian	6 months ago	1
Re: Well then......	jcharding	6 months ago	1
Re: Well then......	tedolf	6 months ago	2
Re: Light gathering in M43 vs FF	Macx	6 months ago
Re: Light gathering in M43 vs FF	tt321	6 months ago
Re: Light gathering in M43 vs FF	Macx	6 months ago
yes	tko	6 months ago
Re: Light gathering in M43 vs FF	Great Bustard	6 months ago	1
Very, very simple:	Great Bustard	6 months ago	2
Re: Light gathering in M43 vs FF	hdkhang	6 months ago
Correct information doesn't pay on this forum...	Beach Bum	6 months ago	1
Re: Correct information doesn't pay on this forum...	jcharding	6 months ago
Really only one truth...	Beach Bum	6 months ago	1
Re: Really only one truth...	jcharding	6 months ago
Perhaps true with DSLRs...	Beach Bum	6 months ago
Re: Really only one truth...	ljfinger	6 months ago
Re: Light gathering in M43 vs FF	BSweeney	6 months ago
Bring back the thumbs down. :)	Beach Bum	6 months ago	2
Re: Bring back the thumbs down. :)	BSweeney	6 months ago	3
Re: Bring back the thumbs down. :)	ljfinger	6 months ago	2
Sensor performance, not just sensor size	Andy Crowe	6 months ago
Re: Sensor performance, not just sensor size	Great Bustard	6 months ago
Re: Sensor performance, not just sensor size	ljfinger	6 months ago	1
Re: The Dark Ages of High Technology and Little Reasoning ...	Detail Man	6 months ago
Pursuit of sameness	Vlad S	6 months ago	1
Re: Light gathering in M43 vs FF	Detail Man	6 months ago	3
Re: Light gathering in M43 vs FF	Lights	6 months ago
Re: Light gathering in M43 vs FF	mapgraphs	6 months ago
Re: Light gathering in M43 vs FF	woof woof	6 months ago
Re: Light gathering in M43 vs FF	Lights	6 months ago
Re: Light gathering in M43 vs FF	JosephScha	6 months ago	1
Re: Light gathering in M43 vs FF	Midnighter	6 months ago
Re: Light gathering in M43 vs FF	forpetessake	6 months ago
You missed the point	JosephScha	6 months ago
Its pizza	Midnighter	6 months ago
Re: Light gathering in M43 vs FF	LJSmak	6 months ago
Re: Light gathering in M43 vs FF	exdeejjjaaaa	6 months ago
Re: Light gathering in M43 vs FF	s_grins	6 months ago
Re: Light gathering in M43 vs FF	Great Bustard	6 months ago
Light density / exposure parameters are the same, "total light" doesn't really matter	Andy Crowe	6 months ago
Total Light Collected is all that matters.	Great Bustard	6 months ago
if Total Light Collected is all that matters, then why...	Andy Crowe	6 months ago
I did not say...	Great Bustard	6 months ago
Missed that line, my apologies	Andy Crowe	6 months ago
Re: Missed that line, my apologies	Great Bustard	6 months ago
Re: if Total Light Collected is all that matters, then why...	misolo	6 months ago
Re: if Total Light Collected is all that matters, then why...	exdeejjjaaaa	6 months ago
Flat-earthers are coming to light, again	forpetessake	6 months ago
Re: Flat-earthers are coming to light, again	jim stirling	6 months ago
Re: Flat-earthers are coming to light, again	woof woof	6 months ago
Re: Flat-earthers are coming to light, again	noirdesir	6 months ago	1
Re: Flat-earthers are coming to light, again	Detail Man	6 months ago
I am amazed that this argument is still going on	Vlad S	6 months ago
Re: I am amazed that this argument is still going on	ljfinger	6 months ago	1
Re: I am amazed that this argument is still going on	dotborg	6 months ago	1
I am curious	Vlad S	6 months ago
Re: I am curious	dotborg	6 months ago
Re: I am curious	Vlad S	6 months ago
Re: I am curious	dotborg	6 months ago
Re: I am curious	Vlad S	6 months ago
Re: I am curious	noirdesir	6 months ago
Re: Grade School Arithmetic	Detail Man	6 months ago
Re: Grade School Arithmetic	ljfinger	6 months ago	1
Re: Grade School Arithmetic	Detail Man	6 months ago
Re: I am curious	ljfinger	6 months ago
DPReview uses them	xandxor	6 months ago	2
Re: DPReview uses them	ljfinger	6 months ago
Re: DPReview uses them	xandxor	6 months ago
Re: DPReview uses them	ljfinger	6 months ago
Re: DPReview uses them	xandxor	6 months ago
Re: DPReview uses them	ljfinger	6 months ago
Re: DPReview uses them	noirdesir	6 months ago
Re: DPReview uses them	xandxor	6 months ago
Re: DPReview uses them	Vlad S	6 months ago
Re: DPReview uses them	ljfinger	6 months ago

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