HELP! There is something wierd with my lens


Status
Not open for further replies.

2layers

New Member
Apr 20, 2005
68
0
0
#1
Hi guys I just bought a lens and the blades inside do not make a symetrical shape. Can someone tell me what is going on? It does not seem to effect the quality from what I can tell but I am still worried. Should I send it back to the manufacturer? It is a sigma
 

Del_CtrlnoAlt

Senior Member
Feb 15, 2003
16,268
0
0
Outside the Dry Box.
Visit site
#2
Hi guys I just bought a lens and the blades inside do not make a symetrical shape. Can someone tell me what is going on? It does not seem to effect the quality from what I can tell but I am still worried. Should I send it back to the manufacturer? It is a sigma

if you have not distorted, then 2 of the lens blade is defective. Under warranty, send it back.
 

slooow

New Member
Feb 12, 2006
1,000
0
0
#3
if you have not distorted, then 2 of the lens blade is defective. Under warranty, send it back.
maybe this is f/2.756 lens stop down to f/8.265?

hahaha okie lame joke... sorry

send back!!! if bought recently can try to exchange a new copy with shop, else send back to sigma:)
 

Feinwerkbau

Deregistered
May 11, 2004
834
0
0
#7
In my experience, not all apeture blades will stop down to exactly the same degree, causing what you see. This is more noticeable in apetures that feature lesser blades.

Sometimes, it's a fault and can be rectified.

Other times, it's just lower quality materials/poorer workmanship that may be inherent in a whole production lot. I've seen it in top name brand lenses as well, mostly cheaper primes and zooms that use less blades, but like you mentioned, it does not affect picture quality in any noticeable degree, unless it's due to sticking, which could get worse.
 

2layers

New Member
Apr 20, 2005
68
0
0
#9
Sending it back today. thanks guys
 

Status
Not open for further replies.
Top Bottom