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Old Feb 25, 2011, 10:30 AM   #1
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Default T2i-Lenses and their best use

Okay, I got T2i and 3 lenses.
1. 18-55mm IS
2. 55-250mm IS
3. 50mm f1.8 II

It's a no brainer when to use the telephoto lens but the confusion is between 50mm and 18-55mm lenses.
50mm has wider aperture but after reading zillions of threads, everyone says it's only sharp at f4 or even better at f5.6. Anything from widest to below f4 will be soft.
18-55mm IS lens also is sharp at f5.6.
Now, if f1.8 is not usable, why keep it when 18-55mm does the same thing and is more versatile?
The nifty gives great DOF at f1.8 compared to the kit lens but if the image is soft, it's no use.
Please shed some light on best usage conditions for 50mm vs 18-55mm lenses. Would like to avoid situations where I use the prime only to discover, I should have used the kit lens.
Thank you so much.
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Old Feb 25, 2011, 10:49 AM   #2
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Most lenses are sharper when stopped down, especially the non pro lenses that are not designed to work best wide open.

The 18-55 works best (gets sharper results) stopped down around f/8 or more.
http://www.bobatkins.com/photography...ws/18-55b.html

Similar is needed on the 55-250 to eliminate the vignetting issue it has when used wide open.
http://photo.net/equipment/canon/efs_55-250IS/

The 50mm f/1.8 gives you sharp results at f/4, which is a couple of stops faster than the kit lenses achieve it at.
And it does let you shoot at f/1.8 if you really need it in dim light!
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Old Feb 25, 2011, 11:02 AM   #3
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Thanks for comment Peter.
So at $100 and very small size, 50mm sounds like a keeper for now even though it may be used very rarely. Besides, this lens' resale value is almost the same as new so will play with it and get some experience.
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Old Feb 25, 2011, 11:03 AM   #4
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Peter really summed things up well. Remember, everything is relative. Is the 50mm 1.8 as sharp as the 50mm 1.2? no. But there's a bit of a cost difference. Is the 55-250 as sharp as the 200mm 2.8? No.
You have to keep things in perspective. For $100, there isn't any SHARPER lenses out there at 50mm 1.8.

Think of the 50mm 1.8 as the "kit lens" for low light, shallow dof photography. Is it stellar? No. But no kit lens is. Is it a good bargain? Yes, it is. It allows you a relatively inexpensive entry into the fields of shallow-dof and low light/available light shooting. Just like a kit lens. After you use it for a while you can make better educated decisions about whether the focal length is right FOR YOUR STYLE of shooting or whether you prefer a longer or shorter focal length. And whether you want even wider apertures. All for a relatively low entry price.
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Old Feb 25, 2011, 11:14 AM   #5
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Great information John.
Since I got this camera, I have been reading books and online forums more than I did for my MBA.
And still a lot to understand and more than that, to apply that in real world when taking pictures.
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Old Feb 25, 2011, 12:21 PM   #6
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my nifty fifty is quite sharp from f/2.0-2.2, if you look at the charts on photozone.de you will see that 50/1.8 is as sharp at f/2.8 as 18-55IS at f/5.6. just stop doubting your choices and start shooting pics
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Old Feb 25, 2011, 1:06 PM   #7
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Will do 'algold'.
Thanks
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Old Feb 25, 2011, 5:18 PM   #8
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BTW, any tips on keeping the lenses/camera moisture free?
I have couple of those pouches that come with electronics to remove moisture (forgot what they are called -- silica gel) in the camera backpack.
Any other things that help?
Thanks.
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Old Feb 26, 2011, 3:04 AM   #9
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Er, Colorado is hardly rainforest.

Try not to dunk them in the bath. Apart from that don't worry, just use common sense, no silica gel required.
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Old Feb 26, 2011, 9:42 AM   #10
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Quote:
Originally Posted by peripatetic View Post
Er, Colorado is hardly rainforest.

Try not to dunk them in the bath. Apart from that don't worry, just use common sense, no silica gel required.
You are right.
It's very dry here. No humidity.
As long I don't move to Houston, I should be okay.
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