Couple of lens questions

Mister_Pister · 17 May 2006 at 20:51

Not owning an SLR yet I dont profess to have a huge deal of knowledge about lenses. I see people saying they have like a sigma 40-100 f5.6 or something. Is 5.6 the only apeture it can do? Or just like its optimum one?

Also me no comprende focal lengths

at a guess im asuming the shorter the length e.g 20mm gives you a wider view then something at say 300mm?

Mister_Pister · 17 May 2006 at 21:10

useful link thanks

I do understand aperture already luckily was just wondering what it meant when stated on lenses

Mister_Pister · 18 May 2006 at 16:01

but on these lenses can u generally stop down the aperture to about 22 or whatever or is there a maximum value on that too?

Mister_Pister · 18 May 2006 at 18:52

ah ok. I was just thinking for landscapes and so on to preserve more detail and increase DOF

Mister_Pister · 18 May 2006 at 20:21

well I have been looking for something to push my rubbish F8 on my sony H1 to its maximum ill give that technique a try while im on holiday

Mister_Pister · 18 May 2006 at 23:50

blimey so much to pay attention to..