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Brand new 17-35mm f/2.8 Nikkor.
Zoom ring rotates smoothly and easily 17-24mm but is really stiff from 24-35mm. Idiosyncrasy of this lens or mechanical problem?
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You would have to disassemble the lens barrel to get to the zoom sliders, and lubrication is not likely the problem anyway. The zoom mechanism uses nylon bushings sliding in a groove, and zoom problems are usually due to wearing/cracking of those bushings.
If it's still in warranty, send it in. Otherwise, the cost of repair probably exceeds the value of the lens. Sorry.
The filter cup, which you removed the name ring from, needs to be removed as well. It has a small set screw near the focus ring that retains it. Remove the set screw and the filter cup can be removed.
The green mark is the index for the aperture setting at 24mm, the yellow mark is the index at 50mm. These really only matter if you are setting the exposure manually and using an external meter. The green mark is the primary mark -- as you turn the ring you will notice that it lines up with a number at every clickstop, while the yellow one is a bit off.
The pull down lever you ask about is the aperture lock. Autofocus film cameras and all digital cameras expect the lens to be set at smallest aperture (highest number). They will give an FEE error if it is not set correctly. When you turn the aperture ring to smallest aperture you will be able to slide the white dot into position next to the orange mark, and that will lock the aperture ring so that it is not accidentally tgurned while using or changing the lens.
2) I do not understand your assertion that it automatically zoomed in. Zooming is a manual function. The automatic functions of your lens pertain only to focusing on of the subject so that your picture is sharp and ensuring that the correct amount of light is admitted so that you have a correct exposure.
3) Are you sure you were turning the zoom ring and not the f-stop ring? The zoom ring is labeled 200 on one end of the scale and 55 on the other. It is also the widest ring on the lens barrel. When you rotate it, the physical length of the lens will lengthen as you rotate it clockwise (viewed from behind the camera) and shorten as you rotate it counter-clockwise.
4) For reference, at 200mm the angle of view on your lens should be 10 degrees and at 55mm about 40 degrees.
My lens started catching as I zoomed in and out and would not go wider than
~24mm. The problem is one or more of the screws holding the zoom
mechanism comes loose and jams. Follow this link for the fix; took me
~20 min to repair (I went very slowly)! Much easier than taking it apart from the rear.
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