Question on Zeiss 1.8/24 ZA on star effect

Started Apr 22, 2012 | Discussions thread
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samdman OP Junior Member • Posts: 49
Re: Question on Zeiss 1.8/24 ZA on star effect

Thanks for your thoughts John. I might try the filter next time.

John Bean (UK) wrote:

samdman wrote:

The Biogon 35 have 10 straight blades while the E 24 ZA have only 7 blades curved ones. So I guess, this should be the issue, probably?

Yes. An aperture with an even number of blades will produce that number of points on the diffraction "star" whereas an even number of blades will produce twice as many but much shorter points at the same aperture.

Additionally the roundness of the aperture will reduce the effect (a circular aperture will produce no star at all) so the lens 7 curved blades will have far less obvious stars than the straight 10-bladed one.

Bottom line is - buy a star filter if you want to see starbursts at wider apertures

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John Bean [BST (GMT+1)]

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