Internal reflections Nikkor PC 10.5 cm?

Hello,

I was trying out some landscapes with a Nikkor 10.5 cm PC on bright partly overcast day, playing around with shutter speeds and aperture and found what looks like flare in some images. The glass looks good to the naked eye but the old flashlight shows some odd spots. See pictures. Is this internal flare? I thought perhaps it was due to oily blades, but the pesky spots remain regardless of f/2.5 or f/32 when using the flashlight; although more intense at f/32. Normally I use this lens for portraits in appropriate light and never noticed anything like this. Any thoughts? I know.. 'don't use it for landscapes.'


Lens: Nikkor 10.5 cm PC ltm with hood
Camera: Leica MP
Film: HP5.
1st Landscape image aperture f/22 or f32
Flashlight test image aperture f/2.5

Thanks!

At that small aperture- I could see that spot causing flare. The 10.5cm F2.5 is easy to take apart. Barrel unscrews from the mount. front element and rear element come out using a standard spanner. You can leave the middle triplet in place and clean from the front and back.

Thanks Brian, I was just watching a video about that. I hope it's cleanable and not some weird coating degradation issue from evaporating oil. Something to do over the long weekend.