5D Mark 4 vs 7D Mark 2

I may have a chance to purchase a 5D4 if it is still available. This will be to more or less replace my 7D2 as it appears a 7D3 is not in the cards. Options to buy new outside of the Canon 'R' system are disappearing fast.

My current understanding is the 5D4 AF system is close to the 7D2 system; better ISO performance; uses same battery and cards so nothing extra to buy.

Currently trying to wrap my head around the effects of 20meg crop sensor vs 30meg FF sensor and where it leaves me.

Anyone with any insights please respond.

Thanks
Rod

RodS57 wrote in post #19167076
I may have a chance to purchase a 5D4 if it is still available. This will be to more or less replace my 7D2 as it appears a 7D3 is not in the cards. Options to buy new outside of the Canon 'R' system are disappearing fast.

My current understanding is the 5D4 AF system is close to the 7D2 system; better ISO performance; uses same battery and cards so nothing extra to buy.

Currently trying to wrap my head around the effects of 20meg crop sensor vs 30meg FF sensor and where it leaves me.

Your question has no answer without more info about lenses used, and the type of photography, whether or not there will be more cropping from the larger sensor, etc.

You can't compare sensors of two different sizes without lenses and contexts.

John Sheehy wrote in post #19167079
Your question has no answer without more info about lenses used, and the type of photography, whether or not there will be more cropping from the larger sensor, etc.

You can't compare sensors of two different sizes without lenses and contexts.

Thanks for the reply but I was hoping for some indication of a mathematical formula but to answer your query:

Mostly wildlife; yes to cropping so I expect to crop more with FF sensor

Not sure why the lens would make a difference. They all project an image circle that covers the sensor. The crop sensor just captures less of that circle but 100L, 70-300L, 100-400L ii, tamron 150-600, 24-105L

If my math is right the 5D4 has about 58% of the pixel density of the 7D2. Haven't figured out what that means at a practical level.

Rod

If you shoot mostly wildlife at distance I'd keep the 7D2 and invest in glass instead. YMMV

RodS57 wrote in post #19167101
Thanks for the reply but I was hoping for some indication of a mathematical formula but to answer your query:

Mostly wildlife; yes to cropping so I expect to crop more with FF sensor

Not sure why the lens would make a difference. They all project an image circle that covers the sensor. The crop sensor just captures less of that circle but 100L, 70-300L, 100-400L ii, tamron 150-600, 24-105L

If my math is right the 5D4 has about 58% of the pixel density of the 7D2. Haven't figured out what that means at a practical level.

Rod

Practically, it just means that you can crop an image less before you notice pixelation. Because whatever you are imaging will cover a greater portion of the 7D2 sensor than the 5D4 sensor, you'll need to crop the 5D4 image to make it look substantially the same.

Here is a link where someone has don the math for you:
http://www.robsphotogr​aphy.co.nz …advantage-appendix-3.html
He shows the pixel density advantage for the crop sensor, although it isn't the easiest blog to follow.

In theory if you crop a 30 meg sensor down to aps-c it would amount to about 18.7 meg, so it would probably appear very similar. Of course it isn't that simple because you are talking about two entirely different sensors.

A quick search revealed this article which might help:

http://www.robsphotogr​aphy.co.nz …-7DII-vs-Canon-5DIII.html

FarmerTed1971 wrote in post #19167112
If you shoot mostly wildlife at distance I'd keep the 7D2 and invest in glass instead. YMMV

Wildlife at distance is the norm. I plan to keep the 7D2 but it is old and has limitations. Just trying to find a path forward without breaking the bank.

Rod

Thanks for the links guys. Got some reading to do.

Rod

The path forward is mirrorless. Not sure if I’d invest in a flapper at this point. Eek out a year or two more with the 7D2 and see what Canon brings to the table next.

FarmerTed1971 wrote in post #19167128
The path forward is mirrorless. .....snip...

That is what I am worried about.

Had a point n shoot about 10 years ago. Dealt with the lag time, the EVF blackouts, power consumption issues etc. Reading a bit in the various 'R' camera threads I see not a lot has changed. Oh, sure, they can do some amazing things but really don't want to go down that rabbit hole.

For all the mirrorless believers out there: enjoy your new toys. Maybe I will become a reluctant member of the club.

Rod

PS: I did do a lot of reading after following the posted links and I did find my answer and yes, in many ways crop is better than FF for what I do. No real surprise there. Thanks for the links.

Ramon-uk wrote in post #19167119
In theory if you crop a 30 meg sensor down to aps-c it would amount to about 18.7 meg, so it would probably appear very similar. Of course it isn't that simple because you are talking about two entirely different sensors.

It is not that high, you need about 50 megapixels in a FF sensor to equal the pixel density of the 7D mark II, so a 5DSR would be about the same.

Based on a quick search of sensor specs, a 5D mark IV is 6880 x 4544 pixels and cropped to the same size as a 7D mark II sensor you get about 4281 x 2840 pixels, a 7D mark II is 5496 x 3670. A 5DSR is 8736 x 5866 pixels and cropped to the same size as a 7D mark II sensor you get 5436 x 3666, very close to the same as the 7D mark II. There are total pixels and effective pixels listed in specs so numbers for actual picture dimensions may be off a bit.

You can also use the area of a aps-c Canon at 22.4 x 15mm vs the FF 36 x 24mm and see the area is 336mm sq. vs. 864mm sq. for FF, or only about 39% the total area of a full frame sensor for the APS-C frame.
30 megapixels times .39 = 11.7 megapixels for a crop to APS-C size from the 5D Mark IV.

Canonuser123 wrote in post #19167198
It is not that high, you need about 50 megapixels in a FF sensor to equal the pixel density of the 7D mark II, so a 5DSR would be about the same.

Yes, going by your calculations you are right. I just did a quick calculation using the crop factor which obviously didn't work too well

Capn Jack wrote in post #19167113
Practically, it just means that you can crop an image less before you notice pixelation. Because whatever you are imaging will cover a greater portion of the 7D2 sensor than the 5D4 sensor, you'll need to crop the 5D4 image to make it look substantially the same.

Here is a link where someone has don the math for you:
http://www.robsphotogr​aphy.co.nz …advantage-appendix-3.html
He shows the pixel density advantage for the crop sensor, although it isn't the easiest blog to follow.

I went through a lot of the reading material but your explanation is sooo much better. Thanks.

Rod