12-31-2017 04:09 PM
I am in creative auto and when I try to select the "background blur" option it only will let me select the 3 closest to sharper. Anyone know why the 2 closest to blur won't work?
I'm using the Canon T7i with the EFS 18-55mm lense. This is my first camera so I'm doing a lot of learning.
12-31-2017 05:48 PM
Page 86 of your manual.
Depending on the lens maximum aperture not all setttings will be possible
01-01-2018 11:53 AM
The amount of background blur is based on three things...
1. Close subject distance... but distant background.
2. Low focal ratio ... lenses that can provide f/2.8.... or f/2 ... or f/1.4, etc. The lower the focal ratio, the stronger the background blur.
3. Long focal length lenses. Wide angle lenses naturally produce a very broad “depth of field”. Depth of field is the range of distances at which things will appear to be acceptably focused. The opposite... long focal lengths, naturally produce a narrower depth of field.
If you combine long focal lengths with low focal ratios and then shoot your subject at a close distance to the camera with a very distant background... you’ll get extreme background blur.
Canon makes a few 50mm lenses... the EF 50mm f/1.8 STM is a bargain at about $125. If you were to use that lens with a close subject and distant background, you would get a pretty decent background blur.
If you used even longer lenses... such as the 85mm f/1.8... or the 135mm f/2... you’d get much stronger blur.
The Canon EF 70-200mm f/2.8L IS USM II is a very popular lens for portraits because the 200mm focal length with f/2.8 focal ratio creates quite a beautiful background blur. I often back mine off to about f/4 and it still has quite a pleasant background blur.
01-01-2018 06:20 PM
Because you are new to DSLR cameras, it is hard to know where to begin. Canon has a Digital Learning Center.
The above link is to the first in a series of videos that teach you about the three legs of the "exposure triangle": shutter speed, aperture, and ISO. Canon also offers tutorials and onlne courses.
I would also suggest that you do web searches for " exposure triangle " and " depth of field ".
01-03-2018 05:47 PM
Depending on the lens you have in use not all of the settings will be available. It comes down to a lenses maximum aperture. This is why the two are not selectable as you would need a lens with a larger relative aperture to get the full effect of this function.
The aperture number is expressed as the f/number on your lens. A larger f/number, such as f/2.8 or f/1.8 will allow more pronounced out of focus areas due to depth of field.