Complex of nebulae in the constellation Cygnus

By the way, this effect isn't visible in the previous shots. I've had this happen on single frames when the field of view passed through wires, but with your 53 frames at 2 minutes each, these effects should disappear when stacked. The only thing left would be spider webs on the lens (just kidding!).

By the way, this effect isn't visible in the previous shots. I've had this happen on single frames when the field of view passed through wires, but with your 53 frames at 2 minutes each, these effects should disappear when stacked. The only thing left would be spider webs on the lens (just kidding!).

Thank you! This effect is created by the Samyang 135mm lens at its widest aperture. If you stop it down a bit, the effect disappears, but it's a shame to lose the light-gathering capability, so this is the result, at the expense of bright stars.

In the previous shots, this effect is actually present where I shot with an open aperture.

Understood. So there is local stress at the edge of one of the lenses. Most likely, either something got between the lens and the cell, or a collimation/centering screw (if present) is applying a bit of excess pressure.

Understood. So there is localized stress at the edge of one of the lenses. Most likely, either something got between the lens and the cell, or a centering/adjustment screw (if present) is applying a bit of excess pressure.