Whats that in the middle of my pic that looks like target. :/

Does anyone know what that is that showed up in the middle of my pic in this shot? Maybe something wrong with my new lens? 

Nikon D750  and  Nikon 20mm 1.8  TechPro Super Slim UMC UV Filter  used 

This looks like internal reflections, caused by a small aperture and your UV filter. Try shooting without the protective filter at night for this lens. 

This looks like internal reflections, caused by a small aperture and your UV filter. Try shooting without the protective filter at night for this lens. 

Thanks Merco I will try shooting without the UV filter and your the second to tell me this. I forgot to tell my buddy about the ring in the middle of the shot but he told me though when I told him I had a UV filter on the lens was "you don't use a UV filter when shooting at night".

Let us know when you find out? Light does not typically bend in concentric circles like pictured even if it is filtered. Strange! It's like the Jurassic park T-Rex took a step and the deep bass made concentric rings on your picture.  

I have seen patterns like this in some other wide angles when night shooting with a small aperture and a filter. It seems to have something to do with light bouncing off the sensor, out through the aperture with some refraction at each glass-air boundary and then reflected from the rear of the filter. It never happened with film because the film is non-reflective and it doesn't happen in daytime as the dark outside the filter is needed to make it work as a weak mirror.

How bizarre. It looks like sound more than it does light. You didn't hear a sonic boom right at the moment the shutter fired did you?

I have seen patterns like this in some other wide angles when night shooting with a small aperture and a filter. It seems to have something to do with light bouncing off the sensor, out through the aperture with some refraction at each glass-air boundary and then reflected from the rear of the filter. It never happened with film because the film is non-reflective and it doesn't happen in daytime as the dark outside the filter is needed to make it work as a weak mirror.

I'm going out to shoot tonight so hopefully the lights will be out and will remove the UV filter.

This looks like internal reflections, caused by a small aperture and your UV filter. Try shooting without the protective filter at night for this lens. 

I took a shot with the the UV filter and the centre mark was there tonight and then I took the UV filter off and the centre mark was gone. So the issue was shooting at night with the UV filter. Thanks for your help Merco. 

I took a shot with the the UV filter and the centre mark was there tonight and then I took the UV filter off and the centre mark was gone. So the issue was shooting at night with the UV filter. Thanks for your help Merco. 

I'm glad to hear that it's the filter and not the lens because the 20mm f/1.8 is on my radar.

--Ron

I'm glad to hear that it's the filter and not the lens because the 20mm f/1.8 is on my radar.

 

--Ron

Its a beauty of a lens Ron and the low light performance superb. 

Its a beauty of a lens Ron and the low light performance superb. 

Yeah, that's what I've heard. And, except for an apparent vignetting problem which is easily correctable in post, image quality is also said to be superb.

Saving my pennies...

--Ron

All the new FX f/1.8 lenses seem to be future classics. I don't have any of them —yet, but they are high up on my list too.

You didn't hear a sonic boom right at the moment the shutter fired did you?

All the new FX f/1.8 lenses seem to be future classics. I don't have any of them —yet, but they are high up on my list too.

I've got a couple of them... the 85mm and the 35mm. They are both outstanding lenses. I particularly love the 85mm. Both sharpness and bokah are amaziing. I only wish they had opted to use rounded aperture blades but if they had a lot of pro users might have opted for that lens over the much more expensive f/1.4 version.

The 35 is also tack sharp with creamy bokah. Terrific lenses. When/if I get the 20mm I'll probably rest for awhile.... even though 28mm is probably my favorite focal length and they just happen to have a new FX f/1.8 version of that.

BTW... I see that Sigma has a new ART lens in the 20mm range that's even faster f/1.4 vs. f/1.8. for about the same price or perhaps a bit cheaper.  

--Ron