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Crop Factor
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Feb 16, 2019 13:16:37   #
joer Loc: Colorado/Illinois
 
Earnest Botello wrote:
Very good shot Joe.


Thanks Earnest.

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Feb 16, 2019 13:18:24   #
joer Loc: Colorado/Illinois
 
Paul J. Svetlik wrote:
I also think Joe, that a focal length longer than 400mm may not be an advantage at all?
It is very hard to frame the image - especially when the target is in motion - for its weight and size, besides the cost of the lens.
A high megapixel sensor with a shorter zoom range offers a good quality print size with the convenience of handling.


Thanks Paul. Agree completely.

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Feb 16, 2019 13:20:45   #
joer Loc: Colorado/Illinois
 
Blair Shaw Jr wrote:
The newer versions with these new sensors are making me look like a better man than I actually am. And the newer telephoto zooms are becoming almost flawless when you crop & enlarge and discover new( yet) hidden images within the original set-ups that even you never saw coming. It's like winning the lottery.

I am so thankful that I lived to see this industry flourish as it has and it gives me great hope about the future as the gear just gets better and better-still. I never get tired of Looking At The World & The Creatures on It.
The newer versions with these new sensors are maki... (show quote)


Thanks Blair. Don't forget the other half of the equation...editing software continues to improve as well.

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Feb 16, 2019 16:24:27   #
JeffDavidson Loc: Originally Detroit Now Los Angeles
 
Beautiful shot and background info!

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Feb 16, 2019 16:36:50   #
joer Loc: Colorado/Illinois
 
JeffDavidson wrote:
Beautiful shot and background info!


Thank you Jeff.

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Feb 16, 2019 19:46:26   #
bodiebill
 
What is the bird?
English sparrow?

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Feb 16, 2019 21:53:03   #
joer Loc: Colorado/Illinois
 
bodiebill wrote:
What is the bird?
English sparrow?


Yes it is. They are also known as House Sparrows.

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Feb 16, 2019 23:20:44   #
frankraney Loc: Clovis, Ca.
 
joer wrote:
When high resolution sensors came on the scene very few people spoke about the ability to make huge crops. Today it is more or less recognized.

As my main interest is birds I realized that this could be a viable replacement for super telephoto lenses at a fraction of the expense, $3000 body vs $10,000+ lens. Does it provide the same image quality? Not in ideal conditions, but these lenses are difficult to use, on many levels.

Here is an example of an image with a crop factor of 5.8 using a 100-400mm lens at 400mm on a 42mp sensor. Granted its not earth shattering IQ but is typical of what I can get with out much effort and some post processing. And though this gear is not inexpensive its a small fraction of the big lenses.

I don't print large often so it suits me just fine...my wallet and back really appreciate it.
When high resolution sensors came on the scene ver... (show quote)


Great photo. Great quality for a crop. IQ is great.......I understand what you say except that the image has a crop factor of 5.8. lost me there.....

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Feb 17, 2019 06:35:49   #
joer Loc: Colorado/Illinois
 
frankraney wrote:
Great photo. Great quality for a crop. IQ is great.......I understand what you say except that the image has a crop factor of 5.8. lost me there.....


Crop factor is a number which describes the affect of sensor size or crop on the lens' apparent focal length relative to 35mm film. Full frame crop factor is 1, DX is 1.5 (Canon 1.6), M4/3 is 2 and so on.

Since you brought this to my attention I checked my number and discovered I used the wrong formula. The true crop factor is 2.4. I apologize for the original error but the point is the same.

In other words the 400mm focal length provided an equivalent sized image to a 960mm focal length.

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Feb 17, 2019 08:30:52   #
frankraney Loc: Clovis, Ca.
 
joer wrote:
Crop factor is a number which describes the affect of sensor size or crop on the lens' apparent focal length relative to 35mm film. Full frame crop factor is 1, DX is 1.5 (Canon 1.6), M4/3 is 2 and so on.

Since you brought this to my attention I checked my number and discovered I used the wrong formula. The true crop factor is 2.4. I apologize for the original error but the point is the same.

In other words the 400mm focal length provided an equivalent sized image to a 960mm focal length.
Crop factor is a number which describes the affect... (show quote)


I understand crop factor, but the 5.8 didn't. Now it sounds better. I hadn't heard of a 5.8 crop factor.

BTW....I was born and raised in Mt. Vernon, I'll.. Down south.

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Feb 17, 2019 08:48:17   #
joer Loc: Colorado/Illinois
 
frankraney wrote:
I understand crop factor, but the 5.8 didn't. Now it sounds better. I hadn't heard of a 5.8 crop factor.

BTW....I was born and raised in Mt. Vernon, I'll.. Down south.


The crop factors for sensor sizes are fixed. When cropping it can vary from the fixed sizes according to the amount of crop.

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Feb 17, 2019 12:03:52   #
PH CIB
 
Sharp as a Tack !!!

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Feb 17, 2019 12:51:10   #
joer Loc: Colorado/Illinois
 
PH CIB wrote:
Sharp as a Tack !!!


Thank you.

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