Question about Canon EOS 400D / Rebel XTi Digital Camera

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I have a canon IS 17-85 lens which feels "locked" no problem with wide angle but you cannot move the zoom more than1/10" before feeling a stop. Prior to this lens worked fine. Regards Simon

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  • calvadnack Sep 17, 2009

    Makes no difference if the lens is on the camera or not it still won't open. Regards S

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Does the lens have the problem when removed from the camera?

Posted on Sep 08, 2009

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Focus out problem in canon 50d while using 24-70mm lens?


If by a "normal" lens, you mean a 35mm or 50mm fixed focal length - often called "prime" lens, that is to be expected. The additional and internal rotating optical elements all contribute to loss of clarity, color loss, and increased chromatic aberration that starts to become noticeable when compared to use of a prime lens. It's a trade off; less number of lenses to carry and lower cost when using wide angle zoom lenses as opposed to a prime lens for even just a few of the focal lengths offered by the wide angle zoom types.

You can minimize the unwanted effects by staying away from both the extreme wide angle and zoom focal lengths as well as the widest aperture settings. If you can stay 2 or 3 stops smaller from wide open, you can limit these destractions from your pictures. This is recommended advice for nearly every lens: Keep away from the extremes.

Good luck!

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I HAVE A CANON EOS REBEL T2 35MM FILM CAMERA AND AM PURCHASING A CANON TI1. CAN I USE THE SAME LENS ON BOTH CAMERAS?


Yes, you should be able to use them. Be aware, moving to digital there is a 1.6 crop factor. The means your 100 mm lens will have the field of view (FOV) of a 160 mm. No, it does not mean it is a 160 mm it is the fFOV is the same as a 160 mm. Also, at the other end is were you will most want to purchase a wide angle lens.
Example: your 28 mm film lens now has the FOV of 44.8, not wide angle. As you can see wide angle is where the move to digital crop sensor cameras lose out. To get back to wide angel you would need a 17 mm lens, that would give you 27.2 mm FOV.
To figure FOV take the lens multiply it by the crop factor. On a Canon it is 1.6, on a Nikon it is 1.5, the 4/3 sensor is 2.0.

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Zooming is done from the lens on a DSLR, assuming you have a zoom lens on the camera. For example, if your camera came with the 18-55mm lens, you should see the numbers 18, 24, 35 and 55 on the lens barrel with a white index line next to one of the numbers. Turn the barrel to move a different number next to the index line. 18mm is wide angle, 55mm is 'zoomed in'.

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1 Answer

Purchase Zoom Lenses


Canon currently makes super Telephoto lenses from 300mm to 800mm and a number of zoom Telephoto lenses from 28-300 to 100-400. You can also special order a 1200mm lens from Canon at a cost of $99k! (There are only about 20 such lenses made so far.)

You can also get a 1.4 or 2x teleconverter to further increase the power of a telephoto lens. However, the cameras are unable to auto-focus when the minimum f-stop exceeds f/8, which can happen when you use one (or both) of the teleconverters on these longer lenses, so you have to manually focus the lens.

You can also get telephoto lenses from other manufacturers such as Tamron and Sigma that are built to work with Canon cameras. However, the Canon lenses are generally regarded as the best quality.

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Optical zoom


Hey needacamera,
The range of an optical zoom lens refers to how wide angle to telephoto the lens covers. An example of a 6x optical zoom would be an 18mm-108mm lens, which covers wide angle to telephoto. An example of a 3x zoom lens would be an 18mm-54mm lens, which would provide a capability of capturing images from wide angle to normal views. To calculate the x factor of an optical zoom you would divide the largest number by the smallest number on your zoom. I hope this helps!

Sincerely,
Allan
Go Ahead. Use Us.

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2 Answers

Lens


Have you ever heard the expression "Good, Fast, Cheap ...pick any two" ? Well, it's that situation. The kit lens is cheap, and it has a good zoom range (including wide-angle) but it's not very high quality. The best lens for you is probably the 17-55 EF-S -but it is $1000. It is a great lens, and it's efficient and light sensitive, along with image stabilization. Without knowing your budget, I would also recommend the 28-135 EF IS, but it doesn't cover the wide angle range. That one is $400. There's also the 17-85mm, which also has Image Stabization. That one is about $500.

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1 Answer

H1 - is this normal ?


I haven't ever noticed anything like that with my camera. There is a slight amount of play on my lens though.

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