Johnnew Archibald - SMGJohn
Well-known member
As a crop sensor shooter for almost 18 years now, started with Canon APS-C, moved on to Panasonic, then Samsung and then back to Panasonic after a while.
I started to accumulate quite the gear and a question popped into my head, we have 60 megapixel sensors since Sony A7r4, why not just crop in that? From a few tests online using Sony A7IV versus A6600, people seemed to get BETTER image quality on the A7IV now that could just be down to the AA filter on the A6600 being a lot more aggressive.
While I do not have a 60mp sensor full frame camera on me right now, DPReview at least has some tests we can see the sharpness.


In these examples the full frame 60 megapixel cameras are actually SHARPER.
Even the 40.1 megapixel sensor on the X-T5 is struggling to match the full frame.
And we know dynamic range is actually better on the full frame even if the noise floor is similar when you crop in. But even then, noise level on full frame is superior to crop sensors.

Notice how even at 6400 ISO, the 60 megapixel full frame sensor is superior.
So what do we get with a crop sensor actually? Weight saving?
Weight difference:
515g - Sony A7cR - 60mpx
665g - Sony A7r4 - 60mpx
723g - Sony A7r5 - 60mpx
438g - Fujifilm X-T50 - 40mpx 1.5x
557g - Fujifilm X-T5 - 40mpx 1.5x
658g - Panasonic G9M2 - 25mpx 2x
660g - Fujifilm X-H2 - 40mpx 1.5x
Okay, all the bodies seem strangely in the same ballpark, funny enough the biggest camera here on this list in physical size is the Panasonic G9M2 followed by X-H2 in second place for pure girth in size, these cameras are literally similar size to old Nikon DX DSLR's...
Okay, so the bodies, not so much size savings unless you want to shoot sub 25 megapixel crop sensor cameras, where the sharpness is further diminished.
Lenses:
409g - Sony FE 16-25mm F/2.8G (2 x crop = 32-50mm)
440g - Sony FE 24-50mm F/2.8G (2 x crop = 48-100mm)
470g - Sigma C 28-70mm F/2.8 DG DN (2 x crop = 56-140mm)
290g - Sigma C DN 18-50mm F/2.8 DC (FF FOV = 27-75mm)
310g - Fujifilm Fujinon XF18-55mm F/2.8-4R (FF FOV = 27-83mm)
530g - Tamron Di III 17-70mm F/2.8 (FF FOV = 26-105mm)
305g - Panasonic Lumix G 12-35mm F/2.8 (FF FOV = 24-70mm)
320g - Panasonic Leica DG 12-60mm F/2.8-4 (FF FOV = 24-120mm)
383g - Olympus M.Zuiko 12-40mm F/2.8 PRO (FF FOV = 24-80mm)
So, we do actually save about 100g~ in weight, but loose out on immense versatility, these full frame lenses are extremely sharp, are they expensive? Yes, more on that later.
So while zoom lenses, are not too impressive weight savings for the most common photography range, with telephoto we see even worse savings because of physics a 400mm F/4 lens will mostly be the same size on either systems just because of its aperture and focal length hence why crop sensors can save weight by making it a 200mm F/4 instead for same field of view as a full frame sensor.
MFT 335g - Panasonic Leica DG 12mm F/1.4 (FF FOV = 24mm)
APS-C 375g - Fujifilm Fujinon XF 16mm F/1.4R (FF FOV = 24mm)
APS-C 405g - Sigma C DN 16mm F/1.4 (FF FOV = 24mm)
FF 445g - Sony FE 24mm F/1.4 GM (1,5 & 2 x crop = 36-48mm)
FF 665g - Sigma A 24mm F/1.4 DG HSM (1,5 & 2 x crop = 36-48mm)
FF 1170g - Sigma A 14mm F/1.4 DG DN (1,5 & 2 x crop = 21-28mm)
APS-C 187g - Fujifilm Fujinon XF 35mm F/1.4R (FF FOV = 53mm)
MFT 200g - Panasonic Leica DG Summilux 25mm F/1.4 (FF FOV = 50mm)
APS-C 264g - Sigma C DN 30mm F/1.4 DC (FF FOV = 45mm)
FF 516g - Sony FE 50mm F/1.4 GM (1,5 & 2 x crop = 75-100mm)
FF 524g - Sony FE 35mm F/1.4 GM (1,5 & 2 x crop = 53-70mm)
FF 778g - Sony FE Planar T* 50mm F/1.4 ZA (1,5 & 2 x crop = 75-100mm)
APS-C 280g - Sigma C DN 56mm F/1.4 DC (FF FOV = 84mm)
APS-C 405g - Fujifilm Fujinon XF 56mm F/1.2R (FF FOV = 84mm)
MFT 410g - Olympus M.Zuiko 45mm F/1.2 ED PRO (FF FOV = 90mm)
MFT 425g - Panasonic Leica DG 42.5mm F/1.2 (FF FOV 85mm)
FF 630g - Sigma A 85mm F/1.4 DG DN (1,5 & 2 x crop = 128-170mm)
FF 822g - Sony FE 85mm F/1.4 GM (1,5 & 2 x crop = 128-170mm)
So we can see the biggest savings, are actually in primes, and while you may seen me use wider zooms earlier on, thats the idea, you can crop in on a similar lens range as the crop sensor and get the same FOV, but the larger sensor also allows a wider field of view.
But with primes, its a different story, we see savings of 100 - 200g easily and as we see with m4/3 sensor there not really any good 85mm equivalent lens thats actually F1.4 but even at F1.2 equivalent FOV lenses, they are still lighter.
Another thing is crop sensors have speciality lenses, not on full frame, Sigma 18-35mm F1.8, 50-100mm F1.8 and Panasonic Leica 10-25mm F1.7 and 25-50mm F1.7.
Such super bright zooms are not available except the Sigma A 28-45mmm F/1.8 DG DN which is 1kg in weight, lets not beat around the bush here while Sigma 18-35mm is a whole 200g lighter, and the Panasonic Leica is 350g lighter!! For a similar field of view, actually the Panasonic Leica lens is not only WIDER, its also longer by 5mm giving you effective FF FOV of 20mm to 50mm at F1.7.
PRICE:
Lets just start with the fact that a mint Sony A7R IV goes for 1800 dollars on eBay and Sony G master 24mm and 50mm are 900~ and 1500~ dollars respectively on eBay, perhaps cheaper, perhaps more expensive in your regional used market.
The Sigma lenses are usually half that price which is also similar to what a lot of the APS-C and MFT lenses go around on used market, these are obviously going to be way more expensive brand new.
But as we can see, Sony A7R IV is around similar prices as a lot of the other crop sensor gear here used. And while A7R IV is a lot older, its still a good camera even today.
CONCLUSION:
So does a crop sensor even make sense if one can buy a high megapixel full frame body, a sensible priced but razor sharp Sigma lens and essentially use the crop modes to achieve the same field of view as a crop sensor, but SHARPER and better dynamic range with BETTER ISO performance???
For photography there not much sense otherwise, a crop sensor seems to only have savings in prime lenses which makes sense if you want the absolute lightest camera gear and do not care about IQ or similar performance, its also much cheaper, used market is littered with used crop sensor cameras for bargains left and right, Sony A7r2 is still around 900 dollars for a mint one. Which is not a bad deal, but its also more expensive than Panasonic G9 or Fujifilm X-H1.
There is also another area I want to touch on the crop sensor might beat the 60 megapixel sensor and thats video, in terms of rolling shutter and codec features, the GH6, G9M2 and the X-H2s are just rolling over every high megapixel camera out there.
For dynamic range you loose at most half a stop in video which is less noticeable compared to photo since most Sony 60 megapixel camera are not geared towards hybrid but prioritises photography.
My biggest gripe however overall, is that m4/3 cameras and lenses, seems hardly any smaller or lighter than APS-C stuff, thats kinda tragic.
--
The most important aspect of photography one needs to understand, are: LOCATION - LIGHTING - LENS
I started to accumulate quite the gear and a question popped into my head, we have 60 megapixel sensors since Sony A7r4, why not just crop in that? From a few tests online using Sony A7IV versus A6600, people seemed to get BETTER image quality on the A7IV now that could just be down to the AA filter on the A6600 being a lot more aggressive.
While I do not have a 60mp sensor full frame camera on me right now, DPReview at least has some tests we can see the sharpness.


In these examples the full frame 60 megapixel cameras are actually SHARPER.
Even the 40.1 megapixel sensor on the X-T5 is struggling to match the full frame.
And we know dynamic range is actually better on the full frame even if the noise floor is similar when you crop in. But even then, noise level on full frame is superior to crop sensors.

Notice how even at 6400 ISO, the 60 megapixel full frame sensor is superior.
So what do we get with a crop sensor actually? Weight saving?
Weight difference:
515g - Sony A7cR - 60mpx
665g - Sony A7r4 - 60mpx
723g - Sony A7r5 - 60mpx
438g - Fujifilm X-T50 - 40mpx 1.5x
557g - Fujifilm X-T5 - 40mpx 1.5x
658g - Panasonic G9M2 - 25mpx 2x
660g - Fujifilm X-H2 - 40mpx 1.5x
Okay, all the bodies seem strangely in the same ballpark, funny enough the biggest camera here on this list in physical size is the Panasonic G9M2 followed by X-H2 in second place for pure girth in size, these cameras are literally similar size to old Nikon DX DSLR's...
Okay, so the bodies, not so much size savings unless you want to shoot sub 25 megapixel crop sensor cameras, where the sharpness is further diminished.
Lenses:
409g - Sony FE 16-25mm F/2.8G (2 x crop = 32-50mm)
440g - Sony FE 24-50mm F/2.8G (2 x crop = 48-100mm)
470g - Sigma C 28-70mm F/2.8 DG DN (2 x crop = 56-140mm)
290g - Sigma C DN 18-50mm F/2.8 DC (FF FOV = 27-75mm)
310g - Fujifilm Fujinon XF18-55mm F/2.8-4R (FF FOV = 27-83mm)
530g - Tamron Di III 17-70mm F/2.8 (FF FOV = 26-105mm)
305g - Panasonic Lumix G 12-35mm F/2.8 (FF FOV = 24-70mm)
320g - Panasonic Leica DG 12-60mm F/2.8-4 (FF FOV = 24-120mm)
383g - Olympus M.Zuiko 12-40mm F/2.8 PRO (FF FOV = 24-80mm)
So, we do actually save about 100g~ in weight, but loose out on immense versatility, these full frame lenses are extremely sharp, are they expensive? Yes, more on that later.
So while zoom lenses, are not too impressive weight savings for the most common photography range, with telephoto we see even worse savings because of physics a 400mm F/4 lens will mostly be the same size on either systems just because of its aperture and focal length hence why crop sensors can save weight by making it a 200mm F/4 instead for same field of view as a full frame sensor.
MFT 335g - Panasonic Leica DG 12mm F/1.4 (FF FOV = 24mm)
APS-C 375g - Fujifilm Fujinon XF 16mm F/1.4R (FF FOV = 24mm)
APS-C 405g - Sigma C DN 16mm F/1.4 (FF FOV = 24mm)
FF 445g - Sony FE 24mm F/1.4 GM (1,5 & 2 x crop = 36-48mm)
FF 665g - Sigma A 24mm F/1.4 DG HSM (1,5 & 2 x crop = 36-48mm)
FF 1170g - Sigma A 14mm F/1.4 DG DN (1,5 & 2 x crop = 21-28mm)
APS-C 187g - Fujifilm Fujinon XF 35mm F/1.4R (FF FOV = 53mm)
MFT 200g - Panasonic Leica DG Summilux 25mm F/1.4 (FF FOV = 50mm)
APS-C 264g - Sigma C DN 30mm F/1.4 DC (FF FOV = 45mm)
FF 516g - Sony FE 50mm F/1.4 GM (1,5 & 2 x crop = 75-100mm)
FF 524g - Sony FE 35mm F/1.4 GM (1,5 & 2 x crop = 53-70mm)
FF 778g - Sony FE Planar T* 50mm F/1.4 ZA (1,5 & 2 x crop = 75-100mm)
APS-C 280g - Sigma C DN 56mm F/1.4 DC (FF FOV = 84mm)
APS-C 405g - Fujifilm Fujinon XF 56mm F/1.2R (FF FOV = 84mm)
MFT 410g - Olympus M.Zuiko 45mm F/1.2 ED PRO (FF FOV = 90mm)
MFT 425g - Panasonic Leica DG 42.5mm F/1.2 (FF FOV 85mm)
FF 630g - Sigma A 85mm F/1.4 DG DN (1,5 & 2 x crop = 128-170mm)
FF 822g - Sony FE 85mm F/1.4 GM (1,5 & 2 x crop = 128-170mm)
So we can see the biggest savings, are actually in primes, and while you may seen me use wider zooms earlier on, thats the idea, you can crop in on a similar lens range as the crop sensor and get the same FOV, but the larger sensor also allows a wider field of view.
But with primes, its a different story, we see savings of 100 - 200g easily and as we see with m4/3 sensor there not really any good 85mm equivalent lens thats actually F1.4 but even at F1.2 equivalent FOV lenses, they are still lighter.
Another thing is crop sensors have speciality lenses, not on full frame, Sigma 18-35mm F1.8, 50-100mm F1.8 and Panasonic Leica 10-25mm F1.7 and 25-50mm F1.7.
Such super bright zooms are not available except the Sigma A 28-45mmm F/1.8 DG DN which is 1kg in weight, lets not beat around the bush here while Sigma 18-35mm is a whole 200g lighter, and the Panasonic Leica is 350g lighter!! For a similar field of view, actually the Panasonic Leica lens is not only WIDER, its also longer by 5mm giving you effective FF FOV of 20mm to 50mm at F1.7.
PRICE:
Lets just start with the fact that a mint Sony A7R IV goes for 1800 dollars on eBay and Sony G master 24mm and 50mm are 900~ and 1500~ dollars respectively on eBay, perhaps cheaper, perhaps more expensive in your regional used market.
The Sigma lenses are usually half that price which is also similar to what a lot of the APS-C and MFT lenses go around on used market, these are obviously going to be way more expensive brand new.
But as we can see, Sony A7R IV is around similar prices as a lot of the other crop sensor gear here used. And while A7R IV is a lot older, its still a good camera even today.
CONCLUSION:
So does a crop sensor even make sense if one can buy a high megapixel full frame body, a sensible priced but razor sharp Sigma lens and essentially use the crop modes to achieve the same field of view as a crop sensor, but SHARPER and better dynamic range with BETTER ISO performance???
For photography there not much sense otherwise, a crop sensor seems to only have savings in prime lenses which makes sense if you want the absolute lightest camera gear and do not care about IQ or similar performance, its also much cheaper, used market is littered with used crop sensor cameras for bargains left and right, Sony A7r2 is still around 900 dollars for a mint one. Which is not a bad deal, but its also more expensive than Panasonic G9 or Fujifilm X-H1.
There is also another area I want to touch on the crop sensor might beat the 60 megapixel sensor and thats video, in terms of rolling shutter and codec features, the GH6, G9M2 and the X-H2s are just rolling over every high megapixel camera out there.
For dynamic range you loose at most half a stop in video which is less noticeable compared to photo since most Sony 60 megapixel camera are not geared towards hybrid but prioritises photography.
My biggest gripe however overall, is that m4/3 cameras and lenses, seems hardly any smaller or lighter than APS-C stuff, thats kinda tragic.
--
The most important aspect of photography one needs to understand, are: LOCATION - LIGHTING - LENS


