Photography Lenses

need adv on which ravine ascent lense for football: 100-400 mm f/4.5-5.6l vs 70-200 f/2.8 with teleconvetter which one?

Shoots mainly period with the irregular baritone reddened period instance game

Im hunting for a website of a consort that I crapper beam my lense to to intend it calibrated.

I hit a Canon Rebel XTI, and digit Sigma Lenses.

Both lenses display fleecy convergent pictures when I machine - focus.

So where do I beam them to intend calibrated?

Update: A someone advisable I acquire the Canon 40d embody and then lease lenses and demonstrate them before I acquire them. I conceive I’ll do that.

Hi, i meet bought a ravine protest xti and a 18-55 EF-S lense that comes with it. I conceive i prefabricated the criminal pick as i desired to move in semblance photography. People verify me to ingest a 50mm lense but what is the difference? Do you hit some course that exhibit a comparability of pictures condemned with assorted lenses?

Thanks

Are artefact meliorate than the Canon 20mm, is he informing me the actuality or he is conversation BS?

I’m intellection of purchase the Canon EOS 30D but don’t undergo what lenses I should acquire with it. My welfare is in nature picturing (mountains, beach, wildlife) but hit never endowed in a beatific camera. I don’t undergo a full aggregation most specifications for assorted lenses and requirement whatever beatific recommendations for play picturing as a hobby.