I've bought a glass 140mm dome port and on a close inspection I found a small imperfection in the glass - a straight line. It is not a scratch or a dirt on the surface of the glass (tried wiping it off on both sides) and is visible only on a darker background (for example with the port cover installed) and only under certain angles. If I look through the port, it is not visible, glass seems perfectly clear. I also tried taking photos with it and it doesn't seem to show on the photos. So I'm wondering if this kind of imperfection is normal and nothing to worry about, or should I replace the dome with a new one?
I've marked it with the red arrows on the attached photo.
If you can't see it in the photos I would not worry about it, seems like an imperfection in the coating of the dome? You are referring to the slightly darker line?
If it is new you might like to discuss with the dealer where you purchased it?
Yeah, I had the same though as Chris. If it's new and from a dealer, have a chat with them about it. If not, and it doesn't show, I wouldn't worry so much.
Could be a bit of a pain if/when you come to sell it on but pretty much the same should apply if it doesn't show in images.
What you say makes sense to me. I guess that's why it doesn't show when I look through the dome and is visible only when I look at it from the front and only under a certain angle. Dome is brand new and bought from an authorized dealer, so I guess there should be an option to replace it. I'm still waiting for their reply. Thanks for your answers!
Update on this: today I found out that this thin, darker stripe apparently can affect the picture quality. If I shoot with the sun in the scene, it appears that the light enters differently through this slit, reflects inside the dome and shows as a lighter ray of light in the opposite side of the dome. See the attached photo.
I've already sent the dome back to the dealer and hopefully it will be replaced with a new one.
3 hours ago, Andrej Oblak said:
I've already sent the dome back to the dealer and hopefully it will be replaced with a new one.
Good move now you have found it does impact on the image.
