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Some eyepieces will NOT come to focus because the scope does not have enough back-focus, in the focuser. The only thing you can do is try another eyepiece or another eyepiece brand.
Hi, nice lens. I bet you don't own one. I am not even going to ask you what your question as as my guess is you would not have chosen so esoteric a category and then not asked the question, so therefore you have a different agenda. Good luck (well average luck).
hi, idont have your camera brand and model#
but i will say thats could be the electronics contact swith where you insert your lens ,
but not shure these contact are for detecting the lens
just look aside the hole if you have it on
yours if yes try to clean it gently...
Set either the camera or lens (or both) to manual focus. Most Nikon cameras have the focus selector switch on the front, under the lens release button.
Look through the viewfinder and turn the focus ring until the image (or at least the subject) appears sharp. A green light will light up when the camera thinks the subject under the currently selected focus sensor is sharp.
Unfortunately, this lens is not supported by the D40 due to Nikon's unfortunate decision to leave out the autofocus motor from this camera. This is why I tell folks not to waste their money on the D40 - access to the many, many, many lenses that Nikon has made over the years, many of which are available used for a substantial savings, is lost on this camera. The only Nikon lenses that work are AF-S lenses, and some third party lenses that have their own internal motors. I got a list of Sigma lenses that are compatible with the D40 for you:
The list of compatible Sigma lenses for the Nikon D40 as of the current date is as follows:
10-20mm F4-5.6 EX DC
12-24mm F4.5-5.6
17-35mm F2.8-4 DG
50-500mm F4-6.3 DG
APO 50-150mm F2.8 EX DC HSM
70-200mm F2.8 DG MACRO
80-400mm F4.5-5.6
100-300mm F4 DG
120-300mm F2.8 DG
300-800mm F5.6 DG
14mm F2.8 EX
30mm F1.4 EX DC HSM
150mm F2.8 EX DG
180mm F3.5 EX DG
300mm EX DG
500mm EX DG
800mm f5.6 EX DG
from here: http://www.imaging-resource.com/NEWS/1177682545.html Sorry for the bad news. The cheaper thing at this point may be to sell the D40 and get a D80. I personally have a D70S, but that is no longer made.
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