Lens reflections ?

[paullacatus]

Sometimes on my A75 I got in the picture some round patterns . Looks like a reflection on lens surface but I don't understand the exact conditions when they appear. I got this efect in one of two consecutive pictures taken from tripod in the same light conditions and does not apear in the other. Has somebody observed such efects ?

Paul

[12345Michael54321]

It sounds like flare, but why not post a picture? It'd be a lot easier to give an opinion if we could see what you're describing.

As for it appearing in one photo, but not in an otherwise identical one taken a moment later... well, the sun does move a little in only a minute, clouds move, a reflective surface like the surface of a lake can be flat one minute and have ripples of waves the next, you yourself may have been in slightly different position - perhaps shading the lens from the flare-inducing light source, etc.

Again, post the photos. Without seeing them, it's almost impossible to be sure just what's happening.

[paullacatus]

Ok ! This is a crop from an image http://www.paul.lacatus.go.ro/poze/flare.jpg

[fredpb]

I can't see the picture. The picture won't come up on my browser, probably me or my firewall.

But if you are having problems with flare, and it is the kind that is preventable you can do this:

You need the external lens adapter, like Canon sells or some websites sell. Lensmate is coming out with one soon for the A75.

Once you have that, you can use a lens hood, which will help quite a bit, especially for outside shots.

You can also start to use filters. I think the A75 adapter available from Canon and current sources uses 52mm filters. Lensmate is making an aluminum small one with about a 37mm filter size.

Use "multicoated" filters. They can reduce glare and increase contrast over regular "glass" filters. There are also "supermulticoated" filters. They cost a bit more though. Multicoated filters are also more difficult to clean, but once you get the hang of that they ar nicer.

For a digital camera I would use "UV" filters only, not a 1a or skylight. You could also use polarizers.

If you got the adapter you will also need a lens cap to fit it.

Using the adapter and filter would also protect your lens (the glass part) and also the protruding lens mechanism. It would stick out a bit. But since Canon has the bayonet mount on the adapter it is easily removable.

I don't use the adapter much on my A40. I keep it on all the time on my S1 IS, and am waiting on Lensmate site to make the aluminum one available for my A75.

I will probably get the 37mm for the A75, and use it for outside shots with the UV filter and lens hood.

[paullacatus]

You cann't see the picture because the provider where I have posted the picture does not allow extrenal referal . I'll try to solve the problem

[paullacatus]

I'll try again to post one image where can be seen a round zone brighter than the rest

http://images3.fotopic.net/?iid=yfvihz&outx=600&noresize=1&nostamp=1

[paullacatus]

Wrong again! Very sorry ! please use http://paul-lacatus.fotopic.net img_0104.jpg

[paullacatus]

or better:

http://paul-lacatus.fotopic.net/p8235431.html

[paullacatus]

or better:

http://paul-lacatus.fotopic.net/p8235431.html