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Hi Chris,
I have attached a picture I took with the 70-200 F2.8 Canon lens at 200mm FL. The aperture was stopped down to 45mm diameter by a piece of card with a hole in it stuck to a 77-72mm stepdown ring. I also used a custom light shield (tube of insulating foam) extending 15cm in front of the lens. The stars in the corners are not round and I have now made another mask 39mm diameter which I haven't tried yet. As you can see reasonable results are possible.
Neale.
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