the aperture won't go below 5.0!!! help!!!!!

Ok so i just got a rebel xt and i cant figure out how to lower the aperature below 5.0 (sometimes 3.5 is changes and i dont know why) in M mode or the Av mode. Please someone tell me how and perhaps some other useful tips in using M and Av modes!!! PLEASEEEE

its because that is the max apperture for the 55mm end of your kit lens. apperture range for the lens is 3.5-5.6.hope this helps

Get a 50mm f/1.8 for $70
It's a must for that price.

at the widest focal length, it can go down to 3.5, and at the max zoom it will only go to 5.6. you just have to get used to it or get a new lens. Don't worry, use flash!

i would also liek to suggest the book Understanding Exposure by Bryan Peterson. Excellent resource for beginners. (not that this place isn't)

When you see a lens that says something like

"f/3.5-5.6" for instance, it moves from the widest the lens can be with the biggest aperture at 3.5 and then once you reach its total zoomed in form, the biggest aperture is 5.6.

That' swhat you get with less expensive lens. To get a contstant big aperture, you need to spend a little.

Although that 50 1.8 is a steal for the wide aperture.

Skiip,

welcome to the forum

The reason for that is that aperture basically is defined as 'focal length of the lense divided by width of exit pupil' ... so if you increase one of the two (by zooming), the aperture also increases ... unless the manufacturer has built some additional (and expensive) feature into the lens so that the diameter of the exit pupil seems to change as well ... in constant aperture zoom lenses.

NB: Maybe some basic course (online/offline) in photography 101 or a good 'beginners book' might answer even more questions for you and give you other insights ...

Best regards,
Andy

What lens is necessary to obtain an aperture value below 3.5?

50 mm f1.8 for $100 and a lot of more expensive lenses.

Gerhard

SIGMA 24-70 F2.8 IS A GREAT LENS.. i JUST SOLD MINE BUT I THINK THEY CAN BE HAD FOR ABOUT 300.00 ON E-BAY.
-ZACKER-

OK ZACKER THANKS FOR THE ADVICE. I AGREE- THAT OR THE TAMRON 28-75

lol, yay for caps locks

Ronald S. Jr. wrote:
OK ZACKER THANKS FOR THE ADVICE. I AGREE- THAT OR THE TAMRON 28-75

youre welcome Ronald.

-zacker-

boo for caps locks .. i have to work in them all day and sometimes I forget they are on...lol so yes, yes you will see more posts in the future in all caps, now I am forever forgiven for my use of caps locks and from this day forward, anyone who comments on it has to, by law, buy me a new "L" lens of MY choice!
-zacker-

So Zacker why do YELL? LOL

Gerhard

twotimer wrote:
So Zacker why do YELL? LOL

Gerhard

I will be expecting the box from B&H with my new 28-300 f2.8 IS "L" in it any time now!!!
lol.
-zacker-