mikew

Cant help with that but the Sigma 100-400 works well on it

DSC_3529 by electric.mike, on Flickr

DSC_3378 by electric.mike, on Flickr

With a Sigma 150-600 a 2x is not a good idea, even if the camera would focus (which i doubt) you would be raising the iso too much to keep the shutter speed up, the advice which none of us like is to get closer to the subject, try shooting that lens wide open which may let you lower the iso so allow for a bit more cropping.

Has the camera had any sort of knock, its possible the phase detect unit is slightly out, if so this would not affect live view focusing as it uses contrast as far as  know.

Have you tried using a tripod and one lens, say the 70 200 at 200, without moving the camera set it at its max minus adjustment take an image then set it to its max plus adjustment and take the same image, see what difference you get

This could be it

https://www.amazon.c...k/dp/B01M27NHG1

Try this i pinched it from another forum

Menu: Settings (wrench): Monitor: EVF Options (only select-able when EVF is in use). Brightness settings on right.

Sounds like it could be a card problem if formatting doest cure it try a new card

Looks like  spam to link to an external editing site

lovely flower image

Hi, from what I read, the FX is a bigger sensor and receives more image detail equalling better image quality. I find the image quality a little dull, despite using varying settings and image save types and am presuming that its the sensor. I have post capture software that can improve that, but I'dlike to get the best image possible from source.

To be honest and not trying to be rude only helpful,FX is not a magic bullet,lets see some DX results so we can help before buying into FX.

Not suggesting flare, thinking more sensor damage from being pointed at the sun.

I have not used it but atmospheric degradation increases with the distance, other things come into play like surface your shooting over, temperature and others, the reason it looks good on the camera back is due to the small backlit image you are viewing, going to stick my neck here and say buying a different camera and doing the same thing will give the same results.

The reason you have seen others complain is because of the same thing,not the answer you want but i had a P900 and would limit my expectations as the distance increased, i viewed it as a tool to get large images of small subjects over a short to medium distance. 

Look at this about 1m30 sec in you can see the foreground being distorted due to the atmosphere, then imagine a still image of it.

https://www.youtube....h?v=LhQlwKX3LQA

I dont think you have a problem with the 750 the 3400 due to its place in the market is designed to give you an acceptable image with low or no input from you,the 750 is a pro tool which could need its settings tweaking by you to give the results you want.

DSC_3871 by electric.mike, on Flickr

DSC_3835 by electric.mike, on Flickr

DSC_3735 by electric.mike, on Flickr