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DOF with a Canon 50mm f1.8 on a 350D


dalowsons 10 89 Australia
6 Dec 2005 3:04PM
Advice needed please ... ! I am seriously considering buying the Canon 50mm f1.8 II lens, but I would be using it mainly for portraits, and my question is this:

1. Compared to the Canon 350D kit lens (18-55mm) will the quality be significantly, if any better ?

2. More importantly, I am aiming to improve the background blur on my outdoor portrait shots - would the 50mm lens make a worthwhile difference to the DOF compared to the 18-55mm ?

Thanks for any help you can give !

Al

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sillyconguru 10 4.4k
6 Dec 2005 3:12PM
1. The 50mm is miles sharper than the 18-55mm.

2. As the 50mm has a maximum aperture of f1.8, it can give much less DOF than the 18-55mm ever could.

The two lenses are like chalk and cheese.
dalowsons 10 89 Australia
6 Dec 2005 3:19PM
Thank you, that has helped clarify what I suspected !

Al
fez 10 262
6 Dec 2005 9:32PM
how sharp is it when you want a good closeup and a relatively wide dof?
mipettin 10 884 2 Scotland
7 Dec 2005 1:17AM
Fez the 50mm f/1.8 is so sharp for close ups at f/4 that you may not want to use USM. If you stop down to f/8 - i.e. want your subjects ears to be sharp as well as the tip of their nose it is razor sharp. When use at wider apertures then DOF becomes very thin when you are close to your subject. There are free utilities on the web to calculate DOF - think one is called DOFMaster. Some previous posters have complained about focus - but when shooting nearly wide open for close ups - DOF can be a matter of several cm and the fault is with the person holding the camera not the equipment. Hope this helps, Martin
malum 10 622 1 United Kingdom
9 Dec 2005 6:17AM
It's as sharp as you like wide open

For shallow DOF outside I'd go for something with a long focal length. The 70-200 F4L gives a very nice dof at the long end.
strawman 10 22.0k 16 United Kingdom
9 Dec 2005 7:10AM
Actualy, its contrast is not so good wide open, but by f2.8 its as good as you would want. It is better than the kit lens.
exclusive 10 579 United Kingdom
10 Dec 2005 8:09AM
2.8 is a minium to use with this lens, at f1.8 and f2 it isn't very sharp at all, but is a very good lens and on holidays do9esn't come off my 35m SLR

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