I need to DIY a super telephoto lens hood, I have an idea, anyone have better?

The Canon new FD 300mm f/2.8 and 500mm f/4.5 both take the EH-123 hood which has a 123mm inner diameter. Of course, it's very expensive now.

This is a black powder coated steel 6 inch to 5 inch duct reducer. The inner diameter of the small side is 123mm which is the same or 1mm more than the outer diameter of the rubber ring on the end of the lens.



Is it a good idea to try to use this? Price comparison is about $20 vs $200 for the real hood. Do you think I should attach it with a hose clamp or try to shim the inside? Recommendation of shim material? Thanks.

I've used an assortment of things as a makeshift hood .
Line the part that goes over the lens with some self adhesive felt / velour.
It takes up the difference and holds the hood on well .

If you can afford that lens then you can afford the lens hood. But really you probably don't need one. Normal and wide angle really need one. Moderate telephoto's maybe. Try it and see. If you really think you need one see neilt3 recommendation.

Too heavy; you can find a 3d printed hood option fairly easily.

Christiaan Phleger said:

Too heavy; you can find a 3d printed hood option fairly easily.

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Too heavy ?
I don't think you'll notice the extra weight of the hood when it's on that lens !

For extra light though , a piece of stuff paper/PVC rolled around the end of the lens secured with an elastic band would also do .