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I'm looking for a replacement hood for my 18-50 f/2.8 EX DC HSM Macro, but I'm not having much success. I've instead found some hoods for the 17-50 OS (stabilized) version, which also has a 72 mm front element and compatible focal lengths.

As this hood snaps to the outer rim of the front element (with a similar mechanism), I'm wondering if it would be compatible with my lens. Does anybody know the degree of standardization?

UPDATE: I've been replied by a Sigma distributor, saying that the appropriate replacement is LH780-04. This does not say anything about the compatibility of LH-825-03 though.

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Testing with two pairs of Sigma lenses shows that no hood fits on any other lens. You have to find a hood with the adequate mount. The lenses tested were:

  • ⌀72mm: different generations of the 17-70mm
  • ⌀77mm: 10-20mm vs 120-400mm
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  • \$\begingroup\$ The other aspect is related to the mount, which I'm not sure has the same bayonet \$\endgroup\$
    – clabacchio
    Sep 6, 2018 at 12:01
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    \$\begingroup\$ Will tell you later, I have two generations of the Sigma 17-70 (8 years apart) I'll see if their hoods are interchangeable and confirm. I also have Sigma's 120-400mm and 10-20mm which I believe are both 77mm to check how far the lens hoods are compatible :) \$\endgroup\$
    – xenoid
    Sep 6, 2018 at 13:20
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    \$\begingroup\$ Checked, and no hood fits any another lens. \$\endgroup\$
    – xenoid
    Sep 6, 2018 at 18:16
  • \$\begingroup\$ Just one last question, since you have so many Sigma lenses (and hoods): I still have the original hood but it doesn't snap so firmly anymore. Also, it doesn't snap at all when reversed (i.e. for storage), is it normal? I can't recall if it ever did, as I bought it second hand \$\endgroup\$
    – clabacchio
    Sep 7, 2018 at 9:05
  • \$\begingroup\$ This is plastic, some part of the bayonet can be broken/worn out (mostly on the hood side). \$\endgroup\$
    – xenoid
    Sep 7, 2018 at 9:15

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