cheap
Newbie
Hello all,
I recently purchased a 20/3.5 Pen F lens at a large auction site. Looking from the rear of the lens I was saddened to find a big spot. I have seen dust-spots before and also fungus. I don't know what is going on in this lens at all! The flaw is inside the lens, towards the rear elements I think.
The lens is on a light-box, viewed from rear. I photographed it with a Zuiko 50/3.5 Macro plus 25mm extension ring:
The flaw also seems reflective, here it is again viewed from the rear of the lens this time looking out a window:
You can see the window scene reflected in the flaw (close-up of above image):
Does anybody know what is going on here? I have no idea if the lens is salvageable or not...
Thankyou, Bruce.
I recently purchased a 20/3.5 Pen F lens at a large auction site. Looking from the rear of the lens I was saddened to find a big spot. I have seen dust-spots before and also fungus. I don't know what is going on in this lens at all! The flaw is inside the lens, towards the rear elements I think.
The lens is on a light-box, viewed from rear. I photographed it with a Zuiko 50/3.5 Macro plus 25mm extension ring:
The flaw also seems reflective, here it is again viewed from the rear of the lens this time looking out a window:
You can see the window scene reflected in the flaw (close-up of above image):
Does anybody know what is going on here? I have no idea if the lens is salvageable or not...
Thankyou, Bruce.
hans voralberg
Veteran
Looks weird, sort of like a chip?
cheap
Newbie
I hope not; the flaw is inside the lens so I don't know how it might get chipped there...
It looks like a chip, or fracture in the glass. I have one lens with a fracture (crack in glass) on an internal element.
If you can return it, do so unless it was cheap. If you keep it, shoot with it and find out the effect on the shots.
If you can return it, do so unless it was cheap. If you keep it, shoot with it and find out the effect on the shots.
squinza
Established
Seems quite large. It's not a bubble, isn't it?
cheap
Newbie
I thought it might be a bubble, but it seems kind of large--more like huge! One wonders how a bubble of that size would escape the notice of quality control. The JCII sticker is long gone if it ever got one!
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Steve M.
Veteran
I haven't seen anything like that before, but it does appear to be a chip possibly. The only thing to do is shoot it w/ a cheap roll of film and get a quick CD at Walgreens or somewhere and see. I'm sure it will have some effect on the photos but unless that particular area is of prime importance it may be negligible. One little pass w/ the clone tool if you do digital processing will probably fix it.
cheap
Newbie
Here's another view of the flaw. Maddeningly, it looks different as you stop down to different apertures (when photographing it):
cheap
Newbie
Despite my screen-name this lens was one of the more expensive I have ever bought secondhand (160 euro). Ouch.
We have just put in a film to be developed, but didn't really test the lens out for the flaw per se.
The flaw is at the 7 O'Clock position. As the Pen cameras default to vertical framing I expect that it will be in the frame somewhere.
sevo
Fokutorendaburando
Looks like a tiny particle that did not dissolve in the molten glass, and created a strain at which the glass chipped creating a tiny crater. Stuff like that happens - but it probably chipped the lens decades ago. If the seller did not describe it, it is time for a return/refund...
Sevo
Sevo
Roberto V.
Le surrèalisme, c'est moi
Maybe a drop of oil? I'd hope it was oil rather than a chip.