1

What is this long thin mark on my lens, fungus or dust?

  • it looks like a scratch to me, but neither picture is clear enough. Have you already cleaned this? It looks like it's had a hard life. – Tetsujin Dec 27 '18 at 17:22
  • I haven’t cleaned it. I just bought it 2 weeks ago. I’ll take another photo of it and post it again but that’s the best I got for now, really hard to see with the naked eye. – Maby Manigbas Dec 27 '18 at 17:43
  • Try lighting it from the side at about a 60° angle to the camera. – Michael C Dec 27 '18 at 20:50
2

Unfortunately, the lighting and focus makes it difficult to tell. But just based on the upload photo, it looks like either a fine piece of lint or dust stuck to the inside of the rear element.

  • Thanks! My thoughts too. I was thinking it’s just a dust but I just want to make sure though. It’s actually hard to see, it took me a couple of minutes to notice it. – Maby Manigbas Dec 27 '18 at 16:36
0

As Tetsujin comments, the mark looks like a scratch, but the photos are not clear, so it could be a long piece of lint, as scottbb suggests. It is unlikely to be dust, which are usually small roundish particulates, or fungus, which usually have a branching structure.

If the mark is a piece of lint on the outside of the lens, you can try using a blower to remove it. If it is on the inside and it really bothers you, the inside of the rear element is easily accessible on many lenses. However, I recommend leaving it alone because the of the likelihood of making things worse while trying to remove it.

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