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Sigma AF 400mm F5.6

Thorkild Ellerbaek , Feb 17, 2011; 05:57 a.m.

I am considering this Sigma lens. I am not sure if it is an APO lens. Is there eny difference between the non APO and the APO?

Responses

Don Cooper , Feb 17, 2011; 06:16 a.m.

In brief, the APO macro is a very good lens, the other iterations of the Sigma 400mm are not.

Hector Javkin , Feb 17, 2011; 09:03 a.m.

All versions for Nikon use the body's screw drive for autofocus. I found the lens (APO version) very slow to focus on a D90, and thus difficult to use for birds. May be suitable for other subjects or with a body that has a stronger focusing motor. Focus is slightly off in attached image.


Sigma 400mm APO on Nikon D90

Rodeo Joe , Feb 17, 2011; 06:04 p.m.

Sigma produced this lens in both APO and "ordinary" versions. The Apo version was a light grey colour and the normal lens had a black finish, but the real giveaway is the word "Apo" printed on the barrel of the Apo version.

As stated above the Sigma Apo 400mm f/5.6 is a good lens if you can find one in mint condition. Check that the infinity focus is where it should be and that the lens hasn't gone misty inside since those are common faults with this lens.

Don Cooper , Feb 17, 2011; 06:16 p.m.

There are 3 APO versions, the regular APO, the APO tele macro, and the rare APO HSM. There also is a non APO version. The non APO and the regular APO do not have a good reputation, the APO tele macro and the APO HSM are the same optically and quite good lenses.

Juan Parmenides , Feb 18, 2011; 08:25 a.m.

I have the sigma 120-400 OS HSM last version and very happy with it. AF is a lot faster than my old Nikkor 80-400 (I sold) and it is sharper too.

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