CraigFair Loc: Santa Maria, CA.

The EOS 7D Mark II DSLR Camera from Canon is characterized by its APS-C-sized 20.2MP CMOS sensor.
The Tamron 150-600mm Lens is designed for Full Frame cameras.
I use it on my Nikon D600 FX with superb results even in the lowest of light situations.
The other night I Auto Focused on Venus, a single point of light in near dark.
The Autofocus snapped right to it with no hunting at all.
The only time I have hunting problems is if I'm trying to focus on something like tree branches or soft clouds with no defined edges.
Craig

oldtool2 Loc: South Jersey

You haven't followed all of the history of this lens. It was released for Canon mount first and had problems with the APS-C cameras. Tamron was aware of the problem and pulled the cameras from the shelves to supposedly fix this problem. They released the lens without fixing the ones they had pulled. They then released a Nikon mount.

Tamron announced they had corrected the problem with the canons but you had to send the lens back to get a firmware update on the lens itself. You can not go by the serial numbers, because many of the later released lenses still had problems. The only way you can be sure is to send it back to Tamron yourself.

Since we are discussing Canon cameras and the Canon mount lens, not Nikon, your comment has nothing to do with this thread.

Jim D

CraigFair Loc: Santa Maria, CA.

Thank you VERY MUCH Jim, I'll crawl back in my hole and ask you directly for permission to post at UHH.
Craig

Bill Emmett Loc: Bow, New Hampshire

I also shoot the Canon EOS 7D Mark II, with the Tamron SP 150-600mm VC lens. I thought I had the very same problem when I first matched the lens to my Mark II. I did some testing, and used my backyard as my test bed, with the canal, and plenty of sea gulls. I found the lens did hunt sometimes in A1 Servo, when the sky was gray, against a white or gray gull. Against the blue sky, the lens did fine. I attribute the hunting to be a lack of contrast. I called Tamron about the situation and they would like to re-calibrate the lens for the Mark II. The camera came out following the original firmware for the lens. Canon also changed some of their parameters for the 7D Mark II, prior to release of the camera. I do remember reading (I think either on Canon Watch, or SLR Lounge) that Canon ditched the 7D Mark II's original sensor, for the same sensor as the 70D with enhancements.
This would explain some of the focus problems in the Tamron lens.

B

fishone0 Loc: Kingman AZ

Have a Tamron 28 to 300mm and it would not work on my old Nikon D300 but it works fine on all my other Nikons. should have sent it in but didn't but I am OK I use it on my Nikon D800 Heard about the trouble Tamron lenses can have.

oldtool2 Loc: South Jersey

Craig,

I would appreciate that but it's really not necessary. LOL!!

Please don't get nasty or upset. I just don't want to see this become a Canon Nikon discussion. I see that way too often and for no reason. It does nothing at all to help the original poster get answers to their questions. I copied the OP's question and posted it below. He is clearly asking about the Canon 7D Mark two camera and the lens for that camera.

"Hello fellow hedgehogs! Was thrilled when I got my 7D mark ii which is a phenominal camera and works well with most of my lenses however.....when using my Tamron 150-600 anything at a distance whether it is a bird or a tree it is having locking on issues. The lens or if if it is the camera just wants to keep hunting so maybe you get a clean shot (when you do it is great!) but most times it just keep hunting even though the camera says it is focused. it was the camera as I was not having this issue with the 7d. I returned the camera and it is having the same issue. Anything rather close their is no problem. Anyone else having this issue. I'm think I saw an update 2 today or yesterday. Any ideas? If this is inherent I may just sell the lens and just use a 1.4 or 2x extender on one of my L lenses. All advice appreciated! Thanks in advance! Just for clarification I returnednthe first mark ii and did get another one which is having the same issue so my guess is that it is the lens. Thanks again!"

Tamron originally released this lens for Canon cameras. It's my understanding the reason they did this was because Canon supplied information to them to make the lens focus properly. Tamron messed up, and many of the canon APS-C cameras had problems with this lens. It took forever for Tamron to release the Nikon mount but when they did it appears that there were no problems with Nikon cameras.

Tamron did a number of firmware updates to try and correct these problems with the Canon cameras. Unfortunately there are still lenses being sold that are not working properly with all the Canon cameras. It is my understanding that the latest firmware update did correct that problem but you have to send the lens back to Tamron to get it done. In the meantime Canon came up with the new 7D which had changes that may or may not be corrected with the new firmware update. The only way to find out is again, send the lens back to Tamron.

I wasn't trying to be nasty with you or anyone else. Just trying to keep this discussion about Canon cameras and the Tamron 150 – 600 mm lens.

Jim D