Lens issues with Nikon D40 camera

Problem solved the green spots were from the sun use your lens hood thats what its for

Aperture issue is related to SQ Base Unit and this part must be replaced. I found this vendor on ebay ;

http://www.ebay.co.uk/itm/NIKON-D40-D40x-D60-SQ-SEQUENCE-APERTURE-CONTROL-MOTOR-BASE-PLATE-UNIT-GENUINE-/330808880495?pt=Digital_Camera_Accessories&hash=item4d05beed6f#shId

Any Nikon digital SLR will work with this lens. However, there are two things to consider.

On cameras other than the D700 and the D3 family, the smaller sensor will make the lens appear as a 105-315mm. On the D40, D40x, D60, D3000, D3100, and D5000 cameras, you will lose the autofocus capability.

Hi ericm675, Yes they will. What you run into is were one uses a auto focus lens on a newer digital such as a D40. Some of the new digital cameras do not have the drive gear to turn the autofocus on the lens. Those newer cameras use electronics. Look on your camera lens mount at 7:00 you will see the drive pin. Look on your old autofocus lens you should see a slot where that pin fits. Hope this helps you.

Please check if the Autofocus-switch on your lens is set to M/A. Also check if the Autofocus on your camera is switched on. For detailed information about your cameras autofocus, please check this site: http://www.kenrockwell.com/nikon/d40/af-settings.htm

while using slr cameras u always see in the viewfinder bcuz slr is a single lence refleime u can see the picture after shoot by clicking on play back option this is a feature of an slr camera

You can but with limitations;
Save me explaining,please read this http://forums.steves-digicams.com/nikon-dslr/137618-sb-25-d40-non-ttl-auto-mode.html

You can download it here.
If you choose the printable download, you have to login and specify your camera serial number.
If you just want to read something, or want to download it to your computer, you can use the non-printable version.

Since the camera is an SLR, (single lens reflex), the CCD image sensor is behind the shutter until you take a picture. Sorry, but you cannot use the LCD to take pictures.

depends which lens you are using some Nikon lens does not work with D40