help weird shapes with 10 stop long exposure

[Tekagudun]

hhttps://flic.kr/p/23gXvFV
ttps://flic.kr/p/21UMrBF
hhi all
took these today 10 stop nd long exposures, but there are weird prism like shapes , which show up more the longer the exposure
poloriser and filter clean ,is it sun reflecting ?
the shapes are symmetrical
any ideas
w nted to get a bit closer with these but maxed out at 85mm
all cc welcome

 

[Tekagudun]

DSC_2276 by ian jarvis, on Flickr

 

[Tekagudun]

DSC_2271 by ian jarvis, on Flickr

 

[davekiddle]

Did you have your viewfinder covered? Light coming in through the viewfinder can affect the image, particularly in bright conditions.

 

[davekiddle]

Or it could be a passing boat!

 

[Tekagudun]

did remember half way through the day
so maybe this was before the light bulb moment
im still trying to check things off as I progress, another thing to remember
cheers

 

[Tekagudun]

a boat did pass
keep going your on a roll

 

[Steve B]

Thats a reflection of the lens aperture, was the sun hitting the filters at all ? Thats what it looks like anyway. If they are screw on filters use a hood, or if in a holder, use your hand to shade them.

 

[AJQS]

Yep, reflection of the lens in the filter. Is it a screw in or square filter?

 

[ancient_mariner]

I think Steve has it.

 

[Tekagudun]

yea square type
sun was directly on it
cheers

 

[Tekagudun]

DSC_2285 by ian jarvis, on Flickr
think you can see it more on this one

 

[AJQS]

Then you need this: https://www.formatt-hitech.com/hardware/firecrestholder