I'm worried about some "greasy marks" I found on my Canon 50mm STM Lens.

mannualv

TPF Noob!
Joined
Dec 10, 2015
Messages
2
Reaction score
0
Can others edit my Photos
Photos OK to edit
Today while I was cleaning my Canon 50mm 1.8 STM lens, I noticed by using the DOF preview button that when it was on f22, there were some visible streaks or oily marks on the aperture blades. I don't know if this is normal, or if this is the way this lens was designed, or if I did something wrong or took improper care of my lens for these marks to appear. Any help would be appreciated, and if someone had this lens, could you also take it to f22, to see if this appears? Thanks.

d11da01999f64c4f8ebf6be66a866426


e6a40715e9f8424cb50126b80820797a
 

beagle100

Been spending a lot of time on here!
Joined
Mar 31, 2015
Messages
2,072
Reaction score
546
Can others edit my Photos
Photos OK to edit
Today while I was cleaning my Canon 50mm 1.8 STM lens, I noticed by using the DOF preview button that when it was on f22, there were some visible streaks or oily marks on the aperture blades. I don't know if this is normal, or if this is the way this lens was designed, or if I did something wrong or took improper care of my lens for these marks to appear. Any help would be appreciated, and if someone had this lens, could you also take it to f22, to see if this appears? Thanks.

I don't think those are "oily marks" but if I get a chance I'll look more closely at my 50mm STM lens at f22
 

tirediron

Watch the Birdy!
Staff member
Supporting Member
Joined
Jul 8, 2005
Messages
45,747
Reaction score
14,802
Location
Victoria, BC
Website
www.johnsphotography.ca
Can others edit my Photos
Photos OK to edit
I can't see anything that looks like oily aperture blades to me, however the images are very small. Regardless, it's extremely unlikely that even if it is the case, you had anything to do with it.
 
OP
M

mannualv

TPF Noob!
Joined
Dec 10, 2015
Messages
2
Reaction score
0
Can others edit my Photos
Photos OK to edit
Today while I was cleaning my Canon 50mm 1.8 STM lens, I noticed by using the DOF preview button that when it was on f22, there were some visible streaks or oily marks on the aperture blades. I don't know if this is normal, or if this is the way this lens was designed, or if I did something wrong or took improper care of my lens for these marks to appear. Any help would be appreciated, and if someone had this lens, could you also take it to f22, to see if this appears? Thanks.

I don't think those are "oily marks" but if I get a chance I'll look more closely at my 50mm STM lens at f22

Thanks. I'll appreciate if you can share if you see this marks on your lens as well. I'm worried :(
 

Most reactions

Top