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01-30-2009, 06:50 AM   #1
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How do you check if you got a lemon lens?

hello,

is any test out there to check if the lens i got is a lemon?

thanks in advance.

01-30-2009, 07:35 AM   #2
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For optics, a quick test would be to post a few images (full size) for people to comment?

Just...some I can think of...

For built, check all movable part running smoothly, image focus, focus gearing noises, glass condition.

Open apecture wide and hold the lens point toward a dim light (warning:not the sun or strong light), look thru it, check for internal dust/ fungus, its ability to transits light source (the light source don't look abnormal/ scattered). Bad quality lens have bad polished which will reduce light gathering power and so does non-coated lens.

Shine a light on the front element, check the layers of different colour reflecting off it to check its coating not damage.



What do you think is wrong with it?
01-30-2009, 08:51 AM   #3
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QuoteOriginally posted by Idanz0r Quote
hello,

is any test out there to check if the lens i got is a lemon?

thanks in advance.
1. smell it, if it smells like a lemon, its a lemon

2. leave it out on the sun for a week, if it starts to rot, its a lemon

3. is it yellow and shaped like a lemon? its probably a lemon

4. on a more serious note, to test lenses you take pictures with them, and then look at the pictures, and evaluate them
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