40D View Finder

[bearSeesAll]

Hi, I bought the EOS 40D today and after played with it, I found something strange. When I looked through the view finder to a very bright object (such as sky), besides the 9 focus points, I see some very fine pattern (irregular black lines and dots) filling up the whole view. but the pattern doesn't affect final image. Can anyone educate me what is this pattern?

[justanut]

Try it without your lens... Determine if its something to do with your lens or camera...

[Fragnatic]

it is meant to be like that. its the focusing screen i believe.

[bearSeesAll]

Originally Posted by Fragnatic it is meant to be like that. its the focusing screen i believe.

Thx， but why is there patterns on the focus screen?

[calebk]

Originally Posted by bearSeesAll Thx， but why is there patterns on the focus screen?

Because that is the way it is textured. It is not noticeable unless you are shooting a very bright scene. Even then, I don't notice, and don't bother to notice it.

[bearSeesAll]

Originally Posted by calebk Because that is the way it is textured. It is not noticeable unless you are shooting a very bright scene. Even then, I don't notice, and don't bother to notice it.

it's not 'bothering' me as you might have imagined. I asked about it just out of curiosity. Maybe you can tell me why it is textured?

[calebk]

Originally Posted by bearSeesAll it's not 'bothering' me as you might have imagined. I asked about it just out of curiosity. Maybe you can tell me why it is textured?

Ok, if you tell me why wood is textured the way it is. It's just the way it's made!

[Ally]

Originally Posted by bearSeesAll it's not 'bothering' me as you might have imagined. I asked about it just out of curiosity. Maybe you can tell me why it is textured?

If I'm not wrong, the matt screen makes it easier to do manual focussing..
Some cams allow you to replace the focussing screen, from matt to clear or split-screen etc..

Just my say..

[grantyale]

The texture allows an image to form on the screen. Screens used to be ground glasses but the laser-cut fine texture on the contemporary screens allow more light to pass through with slower lenses (F/4 and below). The disadvantage is that faster lenses don't look proportionally brighter in the finder and the DOF isn't as shallow as it really is. Slap on an F/1.4 lens, set to Av mode, F/2.0, look through the finder and press the DOF preview button - you don't see much difference at all; stop it further down to F/2.8 and still the difference is small.

I haven't tried it but there is a screen for 40D designed for faster lenses, which might give a more accurate DOF in the finder.

[KHC]

it true on bright day,those matt texture is can be noticable.
it not reflected into the photo teken.

Sometime i doubt , why i can't capture the image quality in bright and good contrast which same as look through from the viewer finder with F4 lens?
may i skill not there yet????

[Kit]

Originally Posted by KHC it true on bright day,those matt texture is can be noticable. it not reflected into the photo teken. Sometime i doubt , why i can't capture the image quality in bright and good contrast which same as look through from the viewer finder with F4 lens? may i skill not there yet????

Photography is never about capturing exactly what you see...

[Rockyboy]

Originally Posted by Kit Photography is never about capturing exactly what you see...

That's true, and that's where creativity starts...

[calebk]

Originally Posted by KHC it true on bright day,those matt texture is can be noticable. it not reflected into the photo teken. Sometime i doubt , why i can't capture the image quality in bright and good contrast which same as look through from the viewer finder with F4 lens? may i skill not there yet????

Because what you are seeing through the viewfinder is subjected to your eye's dynamic range, which far exceeds the dynamic range of the sensor. It is next to impossible to capture a blue sky and a well exposed subject on the ground in most cases, with a single exposure, unless flash is used.