Is this a lens hood?

[psybear]

Apologies if in wrong forum.

I recently acquired a used Nikon 16-35 VR.

First outing at the weekend and I had the Nikon lens hood on at all times. Not surprisingly, this caused a little vignetting in wide open shots - like this one:

However I later took several consecutive shots in Portrait mode of a beach, planning on doing a PS panorama, but the resultant pictures all have huge shadowing, top left and bottom right, like this:

Unfortunately I didn't check the pics at the time (30 minute hike to beach, gale force wind coming off the ocean, in a hurry to get back!). I did have the camera stuffed down inside my jacket on the walk to the beach and it's possible that the hood was loose - in fact it fell off the camera when I got back to the car. But I haven't been able to replicate the effect back home and once the hood is loosened to the extent that it is no longer sitting straight, it falls off immediately? Another pic taken immediately after the sequence but in landscape mode showed none of this effect, but it was taken at 32mm.

Any ideas as to cause of this?

 

[swanseamale47]

It certainly looks like the hood, first off check it's on the right way around with the long part of the "petal" at the top/bottom with the camera in landscape mode (some will fit on the wrong way around ) if thats right check it's the correct hood for you lens..

It's quite possible the double filters are moving it forward enough, try it without them, or at least remove the UV when you use the pola..

 

[psybear]

Thanks Wayne.

Actually have managed to replicate the effect and it was the lens hood. It's quite a stiff fitting compared to that on my 24-70, and if not fully tightened, this is the result. One lost panorama, but lesson learned!

 

[seriousrikk]

The correct hood for a lens should not cause any vignetting at any focal length - was the effect in the top shot caused by it not being on quite right?

 

[psybear]

The correct hood for a lens should not cause any vignetting at any focal length - was the effect in the top shot caused by it not being on quite right?

Really? I assumed it was normal for a wide angle. I get the effect in the top photo with every picture taken wide open. That's with the hood definitely correctly fitted!

 

[Little John]

Do you have a filter on the lens? the reason they make slim filters is for ultra wide lenses to prevent vignetting

The other photo is your hood isnt fitted corectly.

 

[psybear]

Do you have a filter on the lens? the reason they make slim filters is for ultra wide lenses to prevent vignetting

The other photo is your hood isnt fitted corectly.

It might well be a filter issue. I have a Hoya Pro UV filter on all my lenses to protect them and stuck a Hoya cir-pol on top that day (laziness on my part). I'll try a few tests tomorrow with and without the filters and hood.

 

[Jayst84]

It might well be a filter issue. I have a Hoya Pro UV filter on all my lenses to protect them and stuck a Hoya cir-pol on top that day (laziness on my part). I'll try a few tests tomorrow with and without the filters and hood.

Most likely the filters on the first. And looks like the hood is falling off on the second.

Being a second hand lens, are you sure it's the correct hood? There should be a code printed on it somewhere so that you can check it's designed for the lens.

Failing that, it could be bent out of shape if it's been packed into bags and generally knocked about over time.

 

[Little John]

It might well be a filter issue. I have a Hoya Pro UV filter on all my lenses to protect them and stuck a Hoya cir-pol on top that day (laziness on my part). I'll try a few tests tomorrow with and without the filters and hood.

Problem solved, double stacking filters on a uw lens. but even a standard thickness filter will cause it so get a slim one for this lens.

 

[MJ Stebbings]

It might well be a filter issue. I have a Hoya Pro UV filter on all my lenses to protect them and stuck a Hoya cir-pol on top that day (laziness on my part). I'll try a few tests tomorrow with and without the filters and hood.

Interested to know how you got on.
To me, at first I thought it might be stuck apperture blades, but then what do I know

 

[psybear]

First off, thanks for all the helpful advice and suggestions. I haven't used TP for this sort of thing before, and it's greatly appreciated.

The hood is definitely the right one - it's a Nikon HB-23 and it hadn't even been used previously, the lens, packaging etc was all pristine. I'm confident now that, with me stuffing the camera down inside my jacket to protect during the elements whilst I hiked to the beach, this loosened it sufficiently to cause the dramatic effect in the first pic above. I can easily replicate it now - like so:

So I tightened up the hood and re-shot, with both filters in place, and got the same noticeable vignetting:

Hood off next, both filters in place, I can't see a difference, so it isn't the hood's fault:

Cir-Pol filter then removed and a noticeabel reduction in the vignette, though it's still visible:

UV filter off now, so just the bare lens, no hood, no filters, and there is still some vignette:

So I stuck just the Cir Pol back one and took two more, and rotating the filter affected how much vignette occurred:

I will have to post the final image in the next post, only allowed six per thread. :|

 

[psybear]

And here is the final one:

Couple of points - firstly, apologies for quality of pics - I just want some light sky to show the vignette, and I deliberately under-exposed them all by one stop.

Secondly, some Googling reveals that vignetting is normal with this lens when wide open - as it was in al these pictures - and I can live with it.

Definitely learnt a lesson re stacking filters though - and another one about stuffing cameras inside jackets!

 

[MJ Stebbings]

well, its a relief that its not the aperture blades