70-200mm F4 non IS aperture

cruncher75

cruncher75

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Tony
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May sound silly to some but how come the highest the aperture goes on this lens is 200 used with a 550D on manuel mode in sure my sigma 70-200 went higher
 
Okay You have either mispelt something there or you have completely misunderstood the basics of photography. The aperture is the blades inside the lens that open and close to let in more or less light to the cameras sensor and go from f4 - f32 in the case of your lens. So do you mean shutter speed perhaps when you say 200 I.e. 1/200th of a second.?
 
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Are you mixing things up? Max aperture is f22 accordig to the specs. the focal length won't change beyond 200mm unless you use it on a different camera body with a different sized chip (i.e. 1.6x crop as opposed to 1.3x crop) which would make the effective zoom length longer.
 
Yea sorry my bad ment shutter speed put aperture because that's what I was read about at the same time as typing this all seems fine just when I put the lens on the body for the first time shutter speed would not go above 200
 
What mode have you tried the camera in?
Put in Auto or P, or A and select lowest aperture number, go outside and point at the sky, is it still not going over 1/200?
 
Photodiva said:
Are you mixing things up? Max aperture is f22 accordig to the specs. the focal length won't change beyond 200mm unless you use it on a different camera body with a different sized chip (i.e. 1.6x crop as opposed to 1.3x crop) which would make the effective zoom length longer.
Click to expand...

The maximum aperture is f/4, the minimum (smallest) would be f/22.......
 
Photodiva said:
Are you mixing things up? Max aperture is f22 accordig to the specs. the focal length won't change beyond 200mm unless you use it on a different camera body with a different sized chip (i.e. 1.6x crop as opposed to 1.3x crop) which would make the effective zoom length longer.
Click to expand...

Not relevant to the original post but just for clarity, the minimum aperture is f32.

Glad you got the problem solved cruncher. :-). Good call ^Joe and Ecoleman
 
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Photodiva said:
the focal length won't change beyond 200mm unless you use it on a different camera body with a different sized chip (i.e. 1.6x crop as opposed to 1.3x crop) which would make the effective zoom length longer.
Click to expand...

The focal length won't change whatever camera it is used on.
The lens projects an image to the sensor, the smaller sensors aren't big enough to catch the full image so they effectivly crop the image. (The crop factor.)
The framing of the image on a crop sensor will be be the same as a lens of (the crop factor * the focal length) when used on a full frame camera. The actual focal length and other characteristics remain the same.

The limited shutter speed will be because of the flash sync speed. The shutter has 2 blades, the first moves to open, the second follows to close. Abover a certain speed, 1/200 or 1/250 for most dslrs, the blades are following too closely for the shutter to be fully open (the faster the speed, the closer the blades follow each other.)
If the flash fires the flash will get through the gap between the blades but get blocked over whichever part of the sensor the blades are still covering resulting in a dark band across part of the photo.
High Sync speed mode on some flashes pulse the light so light passes through at each stage of the shutter motion.
 
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