Does the crop factor really increas the zoom power
May 15, 2012 16:09:52 #
K7DJJ
Loc: Spring Hill, FL
Does a crop factor give more zoom with a given lens, or does it just crop the photo? Since I think my Fuji with a 720 mm rating gets me a closer photo, than my Canon T3i does at an equivalent 193 rating. I tested the results of taking the same photo at 720 mm (126 mm actual) on the Fuji with its crop factor of 5.9, and set the Canon at 196 mm (123 actual) with its crop factor of 1.6.
After cropping them to the same view, the results show that the Canon shot is nowhere near as clear as the Fuji shot.
The crop factor does give more power to a lens.
After cropping them to the same view, the results show that the Canon shot is nowhere near as clear as the Fuji shot.
The crop factor does give more power to a lens.
May 15, 2012 16:28:16 #
I admire your effort, it's certainly sincere, but it does not meet scientific criteria.
A 100mm lens, for example, projects a given magnification at a particular focal point, regardless the size of the sensor, film, paper (or whatever) positioned at the focal point. A large sensor may "see" the entire image while a smaller sensor will only "see" a portion of it...but it's still the same image size.
This is physics, and as such is not flexible.
Your confusion is shared by thousands upon thousands of people, so don't feel like The Lone Ranger!!
A 100mm lens, for example, projects a given magnification at a particular focal point, regardless the size of the sensor, film, paper (or whatever) positioned at the focal point. A large sensor may "see" the entire image while a smaller sensor will only "see" a portion of it...but it's still the same image size.
This is physics, and as such is not flexible.
Your confusion is shared by thousands upon thousands of people, so don't feel like The Lone Ranger!!
May 15, 2012 19:08:21 #
K7DJJ wrote:
Does a crop factor give more zoom with a given len... (show quote)
What has helped me understand all of this is a Nikon site, but applies to all cameras and lens.
See if the site will help you.
http://imaging.nikon.com/lineup/lens/simulator/
May 15, 2012 20:34:37 #
Do you have the Canon 18-135 or the Sigma 18-125? Or something else? The lens may be lacking compared to your Fuji, they make fine lenses. Remember that the DSLR is lacking pixel density too, though I don't think that is the problem above. You are comparing apples and oranges, the Fuji may be at its optimal aperture and the Canon may want to be at F8 or F11.
Both have their places, but under best conditions I cannot believe your HS10 outdoes your T3i. The deck is stacked in your test, though you made a good effort. That crop from the Fuji is excellent no doubt, but the Canon can be made better, if nothing else with a better lens.
Both have their places, but under best conditions I cannot believe your HS10 outdoes your T3i. The deck is stacked in your test, though you made a good effort. That crop from the Fuji is excellent no doubt, but the Canon can be made better, if nothing else with a better lens.
May 16, 2012 07:26:07 #
Good effort K7D33 but to me the issue isn't crop vs crop but crop vs full frame. EVERYTHING being equal except for lens mm a 200 DX will not be equal to a 300 full frame.
May 16, 2012 12:43:58 #
K7DJJ
Loc: Spring Hill, FL
Danilo wrote:
I admire your effort, it's certainly sincere, but ... (show quote)
Danilo ,
I agree that both lenses were projecting the same magnification on the sensors positioned at the focal point. However the smaller Fuji sensor has more pixels activated by the license plate area, in my example, giving an image size of 214 kb, or 1023 x 679 pixels. The Canon sensor being larger has fewer pixels in the area and gives a much smaller 35 kb image, or 361 x 243 pixels. The smaller sensor gives a much clearer and magnified photo. I should not have used the words, more zoom.
Of course the results would be even worse for a full frame camera.
Doug
PS, The Canon picture quality is much better than the Fuji in normal use.
May 16, 2012 14:41:49 #
May 16, 2012 15:55:01 #
May 17, 2012 10:30:42 #
charles brown wrote:
Good effort K7D33 but to me the issue isn't crop vs crop but crop vs full frame. EVERYTHING being equal except for lens mm a 200 DX will not be equal to a 300 full frame.
Forget the term "crop". They are two different size sensors, each capable of rendering comparable photos. The smaller sensor will have a larger field of view than the larger sensor with the same lens. It isn't an issue of magnification at all.
May 17, 2012 10:31:53 #
brucewells wrote:
Forget the term "crop". They are two different size sensors, each capable of rendering comparable photos. The smaller sensor will have a larger field of view than the larger sensor with the same lens. It isn't an issue of magnification at all.
Forget the term "crop". They are two different size sensors, each capable of rendering comparable photos. The smaller sensor will have a larger field of view than the larger sensor with the same lens. It isn't an issue of magnification at all.
It isn't but when you look through the viewfinder it SEEMS like it's zoomed in.
May 17, 2012 11:08:32 #
K7DJJ
Loc: Spring Hill, FL
Thanks for all your comments, and I agree with most of the comments about a cropped view. The point I was trying to make is the smaller sensor uses all its megapixels for that cropped view. If you take the photo with a full frame camera, and then crop it down to that view, you have fewer pixels in the photo. I used the extreme example of the Fuji 5.9 crop factor to create an obvious example.
May 19, 2012 08:59:37 #
May 19, 2012 09:57:11 #
K7DJJ
Loc: Spring Hill, FL
garceh wrote:
k7djj, How did you arrive at the 5.9 factor for the Fuji?
garceh
garceh
The markings on the Fuji hs10 show that 126 mm is equivalent to 720 mm on a 135 film camera. The 5.9 was from my memory and slightly off, it should be 720 by 126 giving 5.7 for the crop factor.
I made this test because I was getting great bird photos with the Fuji and was told that I could crop the Canon T3i 250 mm photos and get even better results. I only got better shots of birds when I put a 500 mm on the Canon
Jun 17, 2012 20:26:54 #
Look at the example a few post before. It's a crop factor. A larger format will give you a bigger field of view but if take scissors and crop the image you have the same thing. Try enlarging them and you can see the difference.
It's an optical illusion, the photo example shows that.
It's an optical illusion, the photo example shows that.
K7DJJ wrote:
quote=garceh k7djj, How did you arrive at the 5.9... (show quote)
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