How to check new Lens?


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sodium99

New Member
Apr 7, 2005
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#1
Hello people. I'm a newbie here, got a couple of questions I need help from any CSer around...

Whats the meaning of front/back focusing problem in lens especially new ones?
How to look out for them when buying new lens?
If I only got a film slr and no dslr, how to test the lens to see if its a lemon?

Thanks for the help in advance!
 

Goldenstars08

Senior Member
Nov 21, 2004
1,513
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38
Singapore
#2
For front/back focusing problem, when you focus on the subject, pic taken, it seem that either the things behind your subject seen more in focus or the things infront your subject seen more in focus...

If you don't have a DSLR to test the lens, try asking the shop seller to lend you one to test the lens...Hop this help.
 

sodium99

New Member
Apr 7, 2005
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#3
Will the dof preview button helps in detecting the front/back focusing problem? or it will only be known after the picture is taken as Goldenstars08 said? Is the problem repairable or is the defective len exchangeble under the warrently terms?

Thanks.
 

espn

Deregistered
Dec 20, 2002
21,905
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Planet Nikon
#4
DOF button only releases the aperture to the setting set on the camera it will not help to check if it backfocuses.

Backfocusing is repairable calibration can be done on the body/len to ensure they do not backfocus.
 

jumbocrab

New Member
Jun 27, 2004
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#5
Before you pay the money, examine the lens carefully. First, the body exterior. Make sure there are no chips or scratches. Next, look at the reflection of the front and the rear elements to make sure there are no irregularities on the glass, especially the coatings. Third, flick the aperture lever lightly to make sure the aperture closes nicely and properly. Fourth, turn the zoom rings and focusing rings to make sure they are smooth and no weird sounds. Anyone any more suggestions?
 

Apr 10, 2004
240
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16
West
#6
Open up the aperture, hold up the lens towards a light source and look through the glass from the rear and make sure you don't see any feathery / hairy stuff growing on any of the lens elements.
 

wainism

Senior Member
Apr 15, 2004
1,830
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Beeshan
#7
if u getting 2nd hand lens. check that the serial no. of the lens matches the receipt
 

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