What is happening here ?

[Dholai]

Please look at the image shot with a Canon 11-24 and a Lee Big stopper (10 stop ND) at around 12 mm.
What are all these? Present at all apertures (4-22), worse with smaller.
Thanks

 

[zim]

Looks like a bunch of reflections through a window.

Assuming it's not taken through a window can a filter be mounted too far in front of the lens so it catches reflections?

 

[Jim Saunders]

Dust on your lens reflected off the filter?

Jim

 

[Halfrack]

Light leak behind the Lee kit. Shoot a photo of the setup - chances are if you covered the lens & filter assembly you'd see them go away. I take it there isn't a leak at 11mm or at 14mm? I wonder if it's leaking in via the DoF scale window. With a 10 stop, jack your iso up higher, and see if it shows up during a shorter exposure at f4.

 

[eml58]

Had it myself before realising what causes it.

Halftrack has the answer, it's a reflection of the front part of your Lens, caused by light leaking through behind your Lee Filter set up and reflecting off the back of the Lee Filter.

 

[Dholai]

Thanks everybody.
I think I understand what is happening from the input of all of you.
Next question- what is the solution? wrap a black cloth around the filter attachment to prevent light leak ? That would be very inconvenient

emI58- how did you solve it?

Thanks again

 

[Dholai]

I just wrapped a black cloth around the filter and holder and shot . The problem was gone! So , it was light leak and reflection of the front element from the ND filter.
Any practical solution ?

Thanks

 

[neuroanatomist]

Any practical solution ?

Cut off the top part of a black sock?

 

[Mikehit]

I thought the big stopper came with foam(?) gaskets that would make it light proof?

 

[sunnyVan]

This is why after experimenting with the Lee system, I decided to go with screw-on type instead. But I do miss the Lee grad ND filters.

I just wrapped a black cloth around the filter and holder and shot . The problem was gone! So , it was light leak and reflection of the front element from the ND filter.
Any practical solution ?

Thanks

 

[neuroanatomist]

This is why after experimenting with the Lee system, I decided to go with screw-on type instead.

How'd that work out for your 11-24L?

 

[sunnyVan]

Never mind 11-24L which I can never afford. My 82mm screw-on ND won't fit on the rokinon 14mm.

This is why after experimenting with the Lee system, I decided to go with screw-on type instead.

How'd that work out for your 11-24L?

 

[TeT]

Any practical solution ?

Cut off the top part of a black sock?

its either that or black painters tape...

Nice call on the black tube sock; sounds simple and effective ...

 

[Dholai]

Thanks everybody

Mikehit, it has a foam gasket but obviously it does not work.

Neuro, will try to do that- not very convenient though :'(

BTW, the Cokin P filter holder for 100 mm NDs that I use for my all other lenses except 17 T/S and the Otus 85/28 works fine. Never had any such issues.

Does Lee, by any chance, has a solution? Do they even know about this issue?

 

[Mikehit]

Does Lee, by any chance, has a solution? Do they even know about this issue?

Googling 'Lee filters light leak', threw up this on their website.

https://leefilters.uservoice.com/knowledgebase/articles/147876-faulty-big-or-little-stopper-red-lines-flare

 

[Mt Spokane Photography]

Covering the viewfinder either with your eye or the cover can be part of the issue, but you have found the main part of the problem.

If you are following all of the best practice suggestions from Lee, take a photo of your setup and send it to them along with the image you posted.

 

[siegsAR]

Light leak like this can reveal scratches on the filter(s) that you never thought were there.

 

[Dholai]

Thanks all. again.

I found the solution. I think placing the filter in the proximal slot solves the problem. I placed it in the distal one ( just beginning to use it) !

Then I saw the link Mikehit gave from the Lee website. They are exactly right.

BTW, I did cover my viewfinder ( knew that much ) ;D

Thanks everybody

 

[Hjalmarg1]

Thanks all. again.

I found the solution. I think placing the filter in the proximal slot solves the problem. I placed it in the distal one ( just beginning to use it) !

Then I saw the link Mikehit gave from the Lee website. They are exactly right.

BTW, I did cover my viewfinder ( knew that much ) ;D

Thanks everybody

Excellent discussion and learning +1