Pentax smc da 12 24mm f 4 ed al if vs tamron 10 24mm f 3 5 4 5?

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From [Pentax smc DA 12-24mm f/4 ED AL [IF]: Pentax smc DA 12-24mm f/4 ED AL [IF]](/gear/lenses/pentax-smc-da-12-24mm-f-4-ed-al-if/): A zoom lens by Pentax for APS-C cameras, 12-24mm f/4. Specs - Maker: Pentax - Focal length: 12-24mm (zoom) - Maximum aperture: f/4 - Made for: APS-C sensors - Mounts: Pentax K - Stabilised: no - Autofocus: yes What it frames like - On APS-C (Pentax K): like 18-36mm on full frame; f/4 gives about the depth of field of f/6 there. - On the larger-sensor bodies of Pentax K: ...

From [Pentax smc DA 18-250mm f/3.5-6.3 ED AL [IF]: Pentax smc DA 18-250mm f/3.5-6.3 ED AL [IF]](/gear/lenses/pentax-smc-da-18-250mm-f-3-5-6-3-ed-al-if/): A zoom lens by Pentax for APS-C cameras, 18-250mm f/3.5-6.3.

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