Ugly Hedgehog - Photography Forum
Home Active Topics Newest Pictures Search Login Register
Main Photography Discussion
CROP SENSOR - I don't get it
Page <<first <prev 3 of 10 next> last>>
Feb 17, 2019 01:17:38   #
rmorrison1116 Loc: Near Valley Forge, Pennsylvania
 
Bipod wrote:
There is a difference between raising the price (obvious to a buyer)
and sneakily reducing the size of the can (or giving a plastic tub or a
glass bottle a concave bottom, so it looks like it's the same size but holds less).

Being decpetive, sneaky and untruthful used to be shameful in the USA.
It isn't any more. The only shame is in getting caught!


Seriously?! You truly believe they are trying to be deceptive?! Then why is the weight or quantity clearly printed on every label or box or container.

Reply
Feb 17, 2019 06:24:35   #
LXK0930 Loc: Souh Jersey
 
The replies indicated are generally correct. However, a cropped sensor does NOT provide a ZOOM effect... it provides a TELEPHOTO effect.

Reply
Feb 17, 2019 06:46:46   #
camerapapi Loc: Miami, Fl.
 
Your concerns about the so called "cropped camera" are valid and there are some facts that you need to understand to put your mind to rest. So far you have given excellent explanations on this matter and I will chime in with my humble version about the so called cropped factor. I hope it will make sense to you and help you to understand better the whole process involved.

If you use a lens designed for your camera it will use the whole sensor. If you use a lens not designed for your camera but instead it is a lens for use with a camera like the EOS 5D then only the central part of the sensor will be used and pixels will be left out. Either way the lens seems to act as it has a longer focal length due to the multiplying factor created by the smaller sensor. Your full frame lenses on a full frame camera will behave normally and each focal length will be what it is because there is no multiplying factor. it does not matter if you use a lens designed for your camera or not, the multiplying factor will be there because of the size of the sensor. If you want to use all of the pixels available in the smaller sensor you should use a lens designed for the cropped sensor as I said previously.

Only zooms behave like zooms regardless of camera type. A 50mm lens is still a 50mm lens with the small sensor but it is using only the central part of the sensor as I already said and the image as I also explained previously enlarges as a result of the multiplying factor. Perhaps I am making this too complicated for you to understand but those are the facts. All lenses fit to your camera will go through the multiplying factor because of the smaller sensor.

Reply
 
 
Feb 17, 2019 07:39:17   #
sb Loc: Florida's East Coast
 
You are correct - the smaller sensor just gets a smaller part of the image that is created by the lens. so the result is the same as if you had cropped the photo. So this is sometimes called a "crop factor". It doesn't give you the same perspective that the longer lens would.

Reply
Feb 17, 2019 08:19:54   #
Longshadow Loc: Audubon, PA, United States
 
rmorrison1116 wrote:
Not so much as change the focal length.


Then does the focal length magnify?

Reply
Feb 17, 2019 08:30:32   #
Longshadow Loc: Audubon, PA, United States
 
rmorrison1116 wrote:
Seriously?! You truly believe they are trying to be deceptive?! Then why is the weight or quantity clearly printed on every label or box or container.

You check the weight of each item every time you purchase? Then we'll be relying on you to let us know when they go down to 10 ounces!

Raise the price, keep the portion the same.
Reduce the portion, keep the price the same.
Both yield more profit, reducing the portion size is less obvious.

When they shrank the cans to 12 ounces, how many people do you think noticed the change from 16 oz. to 14, to 12??? What about all of the recipes that call for a 16 oz. can of...
I bought a box of crackers, the box is the same size, but NOW there is an inch and a half space in the top of the box. (Bottom if you open it upside down.)

Reply
Feb 17, 2019 08:42:35   #
BboH Loc: s of 2/21, Ellicott City, MD
 
Magnification is a function of the width of the sensor and that of the angle of view.
The horizontal width of the angle of view is divided by the horizontal width of the sensor. As the "crop-factor" sensor is not a wide as a full frame sensor, its width, as divisor, will produce a larger dividend than the full frame, thus the greater magnification.

Reply
 
 
Feb 17, 2019 08:55:00   #
catchlight.. Loc: Wisconsin USA- Halden Norway
 
This all boils down to print size.

Both images will be identical at 300mm at the same mpxl count. PPI is pixels per inch.

The FF will need to be "cropped" to match the already cropped image from the crop sensor camera. The FF will have more detail because of the sensor size pitch and light sensitivity.

When the FF has 30mp and the crop has 24mp then the advantage goes to the FF even further.

Reply
Feb 17, 2019 09:08:56   #
Juy Loc: Delaware
 
The hopper wrote:
I have a Canon 7D which has an APS-C camera sensor and gives a crop factor of 1.6. Some literature I read says that as a consequence, a standard lens will provide a perceived zoom. So for example, if I have a 100mm lens, the camera sensor will provide the equivalent to a 160mm lens (100x1.6 = 160 mm). Other literature just says that it just provides a reduced image from that which a full sensor would provide. In other words a reduced image.

I can't see how a standard lens will provide a perceived zoom. I think it will just in essence crop the picture that would be provided by a standard lens. A lens will just do what it is designed to do and cannot zoom beyond its normal range ... or have I got it wrong?

In short - help!!!
I have a Canon 7D which has an APS-C camera sensor... (show quote)


I have struggled with this and my opinion is it does not make the lens more magnified it does narrow the field of view which as you stated gives a cropped image compared to a full frame, I don't feel it gives any better reach
Just my point of view

Reply
Feb 17, 2019 09:26:40   #
frankraney Loc: Clovis, Ca.
 
The hopper wrote:
I have a Canon 7D which has an APS-C camera sensor and gives a crop factor of 1.6. Some literature I read says that as a consequence, a standard lens will provide a perceived zoom. So for example, if I have a 100mm lens, the camera sensor will provide the equivalent to a 160mm lens (100x1.6 = 160 mm). Other literature just says that it just provides a reduced image from that which a full sensor would provide. In other words a reduced image.

I can't see how a standard lens will provide a perceived zoom. I think it will just in essence crop the picture that would be provided by a standard lens. A lens will just do what it is designed to do and cannot zoom beyond its normal range ... or have I got it wrong?

In short - help!!!
I have a Canon 7D which has an APS-C camera sensor... (show quote)


You are right in all statements.....I think what is confusing you, is crop factor is basically a comparison to a full frame camera, or 35mm.

If you have a crop sensor, with a 1.5 crop factor, it's like taking a photo with a full frame camera and cropping it later. So, if you have a 1.5 crop factor with a 100mm lens, it is like taking a pic with a full frame with a 150mm lens then cropping it....

You are right about the lens, it does nothing other than what it is designed to do.

Make sense?

Reply
Feb 17, 2019 09:29:34   #
Longshadow Loc: Audubon, PA, United States
 
LXK0930 wrote:
The replies indicated are generally correct. However, a cropped sensor does NOT provide a ZOOM effect... it provides a TELEPHOTO effect.

Most people call them the same, since you zoom with a telephoto.

Reply
 
 
Feb 17, 2019 09:41:52   #
DebAnn Loc: Toronto
 
Thanks to everyone who posted on this question. For me, it answered a question of my own - which body and lenses would be the most practical for my trip to Africa, my 6D Mk II or my 70D. I will be taking the 70D with a new Tamron 18-400 lens.

Reply
Feb 17, 2019 09:42:41   #
photogeneralist Loc: Lopez Island Washington State
 
The writer who implied that crop sensors zoom either :
1. Had a misunderstanding of crop sensors
2. Used an unfortunate series of words that poorly described whatever they were trying to get across

Just my opinion.

Reply
Feb 17, 2019 09:44:20   #
Longshadow Loc: Audubon, PA, United States
 
photogeneralist wrote:
The writer who implied that crop sensors zoom either :
1. Had a misunderstanding of crop sensors
2. Used an unfortunate series of words that poorly described whatever they were trying to get across

Just my opinion.


The effect is still zoom...
If it wasn't, why would a 50 look like an 80?
Not talking about the semantics of HOW it got there, just the end result.
There are multiple conceptions/definitions of zoom.

Zoom (motion): rotating the lens to increase the focal length (get closer).
Zoom (effect 1): using a different fixed lens to increase the focal length (get closer).
Zoom (effect 2): Using an APS-C sensor instead of a full frame (get closer).
The perception to the eye, forget the number of pixels.

Reply
Feb 17, 2019 09:48:09   #
olemikey Loc: 6 mile creek, Spacecoast Florida
 
The nice difference with APS-C or H sensor image compared to post processing crop is that you don't lose any pixels, since you use the whole sensor, but it is a smaller sensor, so you get that equivalent view of 1.4, 1.5 1.6 X, depending on which APS-C or APS-H camera, and even greater if a small superzoom bridge camera sensor since they are even smaller. If your APS-C or H is 24MP, you get all 24 MP, just on a smaller image than if FF.

Reply
Page <<first <prev 3 of 10 next> last>>
If you want to reply, then register here. Registration is free and your account is created instantly, so you can post right away.
Main Photography Discussion
UglyHedgehog.com - Forum
Copyright 2011-2024 Ugly Hedgehog, Inc.