Are there any type of Canon lens with a Manual Aperture setting?

Are there any type of Canon lens that allow you to manually change the Aperture control for a canon?
i know they have it for most the Nikon DSLRs
And i know both cameras have an Aperture system, but Canons' have Automatics, and most Nikons' have Manual, and i've been wondering are there ANY Manual Aperture control settings for Canons' ?
Added (1). (Note: I'm new to DSLRs..)
>>> Are there any type of Canon lens with a Manual Aperture setting?

How would my Scientific Method look?

If I'm doing a Scientific method on a Canon brand DLSR vs.a Nikon DLSR what would be my purpose, hypothesis, research, experiment, independent variable, dependent variable, and control?
>>> How would my Scientific Method look?

I've had my Nikon d40 for five years now?

I would like to upgrade, is the Nikon d7000 a good pick?
>>> I've had my Nikon d40 for five years now?

Olympus, Nikon or Canon?

I want to change my compact digital camera.It's an Olympus. I've always had Olympus and they've always been good. However, I've never been happy with this one (had it about 18 months), so I want to change it. But I don't want to end up with another camera I don't like.

In get the "feeling" that Nikon are better than Olympus?
>>> Olympus, Nikon or Canon?

What should my next lens be?

I own a Nikon D7000 with a Nikorr 35mm 1.8G, Tokina 11-16mm and a Nikorr 70-300mm and I'm considering a new "go-to" lens. I don't really know which one to go with and I don't wanna spend much on it… was thinking about either a 55-200 VR, a 85 or a 105, either macro of for portaits.
>>> What should my next lens be?

Shooting couple portrait with Nikon 60mm micro?

I'm doing a couple portrait shoot, one is embracing another from behind, but the person behind is a bit blurred. I'm standing about 6 feet from them, using Nikon D90, "A" mode with iso 100.

How do I shoot them both clear?

Many thanks!
>>> Shooting couple portrait with Nikon 60mm micro?

What is the better lens: Nikkor 50mm f1.4 or f1.8?

The 1.4 is almost $250 more, but is it worth it? I want a really sharp portrait lens for a big trip I have coming up that will get me excellent results (great DOF, etc). Should I spring for the 1.4 or is it not worth it?
>>> What is the better lens: Nikkor 50mm f1.4 or f1.8?

First Nikon d5100 lens upgrade?

I have the kit 18-55mm lens, but I'm not satisfied with its low light performance or its limited zoom abilities.

For low light as well as great overall performance, I am considering the 35 mm prime lens. I've heard great things about it. Thoughts?

For a sharper and more versatile lens with zoom capabilities, I am thinking about trading in my 18-55mm (I know it isn't worth much) and opting for either the 16-85mm, the 18-105mm, the 18-135mm or the 18-200 mm. Which of these, in your experience, would be the most useful and versatile? Which of these is the sharpest?

Overall, I am looking for two great travel lenses that can accomplish a lot without having to lug a mountain of gear around with me.
Added (1). Edwin,

thanks for the response. Assuming that the 35mm helps me out with low light for now, which of those other lenses would be best for a nice zoom range, low lighting not being a factor?
>>> First Nikon d5100 lens upgrade?

Is my camera broken, why is my pictures black?

Okay I bought a nikon d5100 from amazon from reconditioned and it works perfectly but for some reason on the setting that is MASP when I take the photo it comess out black? Idkif there is a problem with my camera or the settings.

Can anyone explain to me? Thanks!
>>> Is my camera broken, why is my pictures black?

What is the equivalent Nikon model of the Canon EOS 600D and 650D?

Also which is better? Nikon or Canon. Cannot choose between the two. I am just beginning photography and I want the best DSLR.
>>> What is the equivalent Nikon model of the Canon EOS 600D and 650D?

Can I use eye glass cleaner to clean my camera lens?

I have a Nikon 70-200mm VR II IF… it was a pretty penny and I don't want to f-up the lens. Can I use my eye glass cleaner spray on the lens of my camera and wipe it with the microfiber cloth?
>>> Can I use eye glass cleaner to clean my camera lens?

Nikon d7000 and 18-200 mmVR fine tune?

I have a d7000 and my main lens is a 18-200mm VR from nikon… do i need to "AF fine tune" this lens and camera?

if so what settings are best?
>>> Nikon d7000 and 18-200 mmVR fine tune?

Recomendations for a new camera?

Ok, so im saving up for a new camera but i have no idea what kind to get. I was thinking a Nikon, but i dont know, comparatively speaking, what companies make the best cameras. Most of the pictures that i take are close-ups, dont know if that makes any diffrence. I know that cameras are expensive, but i would prefer one in the $200-350 price range, but nothing above $700. If there are any pro-photographers out there that have any input i'm all for it.
>>> Recomendations for a new camera?