Ive been looking at reviews trying to figure out what I want to start saving towards...
I dont understand what the difference is between all the lens. My questions might be silly/obvious but I just want to know if I understand this all
These two for instance:
sigma 170-500 4.0/5.6
sigma 17-70 dc macro
What do the numbers mean? Are the first two numbers the focal length? And the second something to do with aperture? When it only has one number at the front is that maximum or minimum? Or something else?
Do certain bodys have certain aperture settings allowable or is that specific to lens?
Im sort of looking at the Canon XTI as a step up from my Powershot but Im hesitant to get that and end up wanting something more.. (Its still many months off but Im wanting to start looking and saving now) If I go with the XTI what lens would you guys recommend?
totally lost on these. Any help is appreciated.