Pentax smc da 200mm f 2 8 ed if sdm vs pentax smc da 300mm f 4 ed if sdm?

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From [Pentax smc DA* 200mm f/2.8 ED [IF] SDM: Pentax smc DA* 200mm f/2.8 ED [IF] SDM](/gear/lenses/pentax-smc-da-200mm-f-2-8-ed-if-sdm/): A prime lens by Pentax for APS-C cameras, 200mm f/2.8. Specs - Maker: Pentax - Focal length: 200mm (prime) - Maximum aperture: f/2.8 - Made for: APS-C sensors - Mounts: Pentax K - Stabilised: no - Autofocus: yes What it frames like - On APS-C (Pentax K): like 300mm on full frame; f/2.8 gives about the depth of field of f/4.2 there. - On the larger-sensor bodies of Pentax K: ...

From [Pentax smc DA* 300mm f/4 ED [IF] SDM: Pentax smc DA* 300mm f/4 ED [IF] SDM](/gear/lenses/pentax-smc-da-300mm-f-4-ed-if-sdm/): A prime lens by Pentax for APS-C cameras, 300mm f/4. A weather-sealed telephoto prime for wildlife. Specs - Maker: Pentax - Focal length: 300mm (prime) - 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 450mm on full frame; f/4 gives about the depth of field of f/6 there. - On ...

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