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Old Apr 2, 2007, 6:44 PM   #1
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I have bought a Pro Tama 55mm 0.5x wide angle lens for my FZ-30.
I want buy some filters to add on top of this wide angle lens but I don't know what is the size of the top ring.

Anyone know what size is it? Or how do I measure it? Do I measure the outside rim or the inside of the rim to tell the size?
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Old Apr 2, 2007, 7:55 PM   #2
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The inside surface of the front end of the lens should be threaded so you can attach a filter. No threads, no filter unless you can find a slip on filter! By custom they usually show the filter diameter somewhere on the lens as a number along with an o with a slah through it, the diameter symbol.
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Old Apr 3, 2007, 9:23 AM   #3
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Be careful, Adding a filter to the front of a wide angle addon lens may produce vignetting. You need to check first. Plus if the front of the lens is not threaded, then it is not designed to take filters.
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Old Apr 3, 2007, 5:27 PM   #4
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Thanks!
The front of my lens is threaded, but what is vigetting?

amazingthailand wrote:
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Be careful, Adding a filter to the front of a wide angle addon lens may produce vignetting. You need to check first. Plus if the front of the lens is not threaded, then it is not designed to take filters.
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Old Apr 3, 2007, 7:24 PM   #5
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Vignetting occurs when an attachment to the lens, such as a lens hood or filter, intrudes into the light path to the lens causing black corners.
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Old Apr 4, 2007, 5:26 PM   #6
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Yes, what you will see on your image is darkened corners. How bad will depend on the amount of vignetting that occurs.

Special 'low profile' filters are available to minimize vignetting.

But before you go spending a lot of money on filters, low profile or otherwise, do some tests to determine if vignetting will occur, and if so, how bad it is.
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