I have not dealt with this myself, as I don’t have any Tamron lenses. I believe, however, that this is a potential symptom of an incompatibility between the [third party] lens and a newer [than the lens] body. These are usually addressed by either lens firmware updates or sending the lens back to Tamron for upgrading. I’ve heard that Tamron is quite forthcoming about any incompatibilities they know about, so you should try contacting them to see if that’s the case here. If they don’t believe it’s that issue, next step would be to try another copy of that lens to see if your particular one has some kind of fault (unlikely, I would think, if it works fine on other cameras). Unfortunately, I don’t believe you’ll have any luck at all with Nikon as they won’t fix their own bugs, let alone take any responsibility for incompatibility with 3rd party lenses. :(

I use Tamron 90mm 2.8 Macro lens and it works excellent in picture mode.

But in video mode I can’t user autofocus what ever I do and what ever settings I apply (!!)

It simple won’t focus any point. It starts to focus, move lens a little bit and that’s all, stops there…

Do you know anything about this?

Thanks.

The AF-C issue is a deliberate decision by Nikon across their entire current line-up – D3200 through D800. They’ve admitted this explicitly. Though I don’t know if it affects the D4, admittedly.

The AF-ON issue affects all D5200s, I believe. I’ve seen it mentioned periodically in various forums. It is specific to the D5200, presumably because of the rotating LCD. Nobody seems to have ever gotten an official response from Nikon on it, though.

I don’t know how broad the menu hang is. I’ve reproduced it on multiple D5200s, but I haven’t come across anyone else talking about it online. Though I’m not surprised – it’s a pretty obscure bug.

Have you noticed the competition always have the edge on Nikon for the same price range and they include tethering software free. Nikon make you pay for it. Perhaps it’s time for us to wake up and accept that Canon can actually make decent cameras and lenses which the pros are relying on everyday. I know once we buy into lens kits, we are loath to change brand, but Nikon need to sharpen up. They take it for granted that we will keep accepting less as long as we can hang their name around our necks.

I’m sure you know what u are talking about and have explored every possibility. I can’t believe their is such a lack of features on the Nikon D5200. They are not intuitive, nor good for pro shots that need quick adjustments. However, they are fine for snails.

By the way, if your lens is and AF, the auto focus will still work even when the camera hangs. It is independent and feeds info into the chip of the camera.