melanieillich

I hope this posts at the right place as first time posting on this site. Thanks for all your help! In trying the above things, I found that the diaphragm was not working. In trying the series of exposures that William Michael recommended, as well as per Matthew Curie. They didn' t have the same exposure at all. Also, when I put it on "A" mode, I noticed regardless of what f stop I chose, the shutter speed didn't change. I did remember to try the recommendation of using a different body and tried it on my d5000. Yep, same thing happened. Tamron said it was under warranty of course, and "replaced the aperture apparatus" and it should be in my hands today. Those were all great tests I now know to use in the future....I couldn't figure out what to turn off or leave automatic to isolate the problem. (And, I did actually have a firmware update for Nikon I had no idea about. So I appreciate that info even though it didn't fix this issue.)

I have had a Tamron SP 150-600mm f/5.-6.3 di VC for several months and have loved it. I have used it with my Nikond500 with great results for all kind of nature shots. I typically shoot in manual mode, with iso on Auto, adjusting the exposure compensation as needed. In the past few days, if I try and shoot with the aperture over f11, the image is overexposed. As I INCREASE the aperture, it just gets brighter and brighter. I have had to decrease the exposure compensation to the most extreme (-5.0) and still overexposed. The shots are of my same yard, birds, etc. that I have done for a few years so I typically know what shutter speed, etc. to set my camera on. I even tried resetting my nikon D500 to factory settings in case I messed with something in error. I did try my nikkor 70-300mm lens which I haven't used since getting the above lens and it does not do this but it is a much shorter lens. Any idea other than my lens needs repair what might be going on? Thanks for any help.