topic Re: Weird Lines in EF & RF Lenses

Weird Lines

tatlyne — Thu, 11 Apr 2019 14:52:50 GMT

Hi, I'm new to DSLRs and just finding my way around the camera. I'm also practising taking photos with my new telephoto lens (canon: EF 75-30mm) I get a lot of Chromatic aberration and have the correction for it enabled in camera. I'm thinking it's mostly me taking crappy pictures, lol, plus I have an old sd card from an old canon point and shoot (which I'm replacing today). In any case, I'm hoping for help on identifying what these odd brown lines in this photo are (I outlined in yelow) and why they occurred? It almost looks like a type of shadow from the tree branches? How can I correct for this? Thank you so much for any help you can provide.

Re: Weird Lines

ebiggs1 — Thu, 11 Apr 2019 15:04:32 GMT

Hairs on the sensor. Clean the sensor.

Re: Weird Lines

tatlyne — Thu, 11 Apr 2019 15:28:20 GMT

Really? This is the only pic that the lines are in?

Re: Weird Lines

tatlyne — Thu, 11 Apr 2019 15:45:00 GMT

Here is a picture of the front of my dishwasher. Other than the glare spots, are you seeing anything that looks like hair or other debris on the sensor?

Re: Weird Lines

ebiggs1 — Thu, 11 Apr 2019 15:52:41 GMT

It was just a guess and the most easy to correct.

Re: Weird Lines

BurnUnit — Thu, 11 Apr 2019 19:47:11 GMT

That's just bizarre. Viewed at 100% these marks are surprisingly well focused and semi-transparent to varying degrees and never completely opaque. They extend even further into the frame beyond where they're marked in the sample photo. Does your Rebel SL2 have a touch screen LCD?

Re: Weird Lines

Stephen — Thu, 11 Apr 2019 17:12:41 GMT

Do you have a UV or polarizing filter on your lens? Could these be reflections bouncing back into the lens from additional glass attached to the lens? Just a guess?

Re: Weird Lines

MikeSowsun — Thu, 11 Apr 2019 19:31:08 GMT

Both photos look to have been cropped or resized. Can you upload the originals?

Exif data says the "brown lines" photo was taken at f/7.1 which wouldn't tend to show dust or hair on the sensor.

Exif data says the "dishwasher" photo was taken at f/22 but shows no dust, hairs or other debris on the sensor.

I suspect the brown lines are just out of focus branches from the foreground trees. There really is no other explanation.

Re: Weird Lines

tatlyne — Thu, 11 Apr 2019 20:14:08 GMT

Yes, it does.

Re: Weird Lines

tatlyne — Thu, 11 Apr 2019 20:15:48 GMT

Thank-you for your guess It prompted me to search on it and hense the idea to take a picture of something white to inspect for dust/dirt/hair ...

Re: Weird Lines

tatlyne — Thu, 11 Apr 2019 20:21:06 GMT

Nope, nothing like that but to me, it did appear to be some sort of weird shadow from the tree branches? As mentioned, I'm new to DSLRs and just learning all the features so my photos are really bad but I must say that I wouldn't expect them to be so bad as they seem to be (fairly severe chromatic aberration on most pictures but some have not ... these odd brown lines ... ) using this telephoto lens. So I find myself wondering if it is me or the lens! lol

Re: Weird Lines

tatlyne — Thu, 11 Apr 2019 20:23:15 GMT

That sounds plausible. I had to resize the photo to post it here because at original size it was larger than the maximun allowed to be uploaded here.

Re: Weird Lines

TCampbell — Thu, 11 Apr 2019 21:11:34 GMT

Those are tree branches. But they're close enough that they aren't in sharp focus ... so you see them as strange lines that aren't well-defined.

When you shoot, you want to watch the composition not just of your intended subject, but also keep in mind what will show up in the foreground and the background. It's fairly common to need to change where you position the camera ... or if you have someone with you, ask them to hold the branches out of the way while you get the shot.

With a point & shoot type camera or a camera phone, the physics of the optics (extemely short focal length lenses) means that the depth-of-field is usually very broad ... this causes the foreground & background to be fairly well-defined in most images. Wtih large sensor / large-lens cameras, you get a shallower depth of field (which can be used to artistic advantage with the right lenses) and it's less clear why you see this stuff.

Re: Weird Lines

Waddizzle — Thu, 11 Apr 2019 23:11:13 GMT

@TCampbell wrote:
Those are tree branches. But they're close enough that they aren't in sharp focus ... so you see them as strange lines that aren't well-defined.

They look like tree branches to me, too. Whatever they are, they are between the camera and the focused DoF, Depth of Field. In other words, what you are seeing is normal. It is the exact opposite of seeing distant background objects OOF, out of focus.

In this case, objects that are relatively closer to the camera that the focused subject are OOF, just as objects that are relatively further away from the focused subject appear OOF.

This photo is an example of what I mean. Foreground branches are OOF.. It is just not quite as extreme as your example photo.

Re: Weird Lines

ebiggs1 — Fri, 12 Apr 2019 14:24:39 GMT

If they are branches why are the ones obviously closer to the camera in better focus? One appears to be in front of the canoe and one behind it.