I recently bragged about the completion of the Polarex 114 renovation: https://www.cloudyni...n-photo-report/ Since then, I have had the opportunity to direct the instrument only to the stars and Mars, I am still waiting for an opportunity to look at the Moon, which in my opinion is one of the most important tests for this type of refractor.
However, during my rehearsals on the stars, I observed a strange phenomenon. Phantom reflection appears near bright stars. It is much fainter in brightness, appears pinpoint at low magnifications, but turns out to be somewhat out of focus (resembles a faint globular cluster or planetary nebula) at higher magnifications. The greater the magnification, the greater the star's distance from the reflection. The reflection does not move with respect to the star due to the movement of the head or OTA, but changes the angular position in the field of view when the lens cell is rotated, and therefore clearly comes from the lens.
Has anyone encountered such a phenomenon? As I wrote in the previous thread, the lens went to a service technician who undertook to clean the heavy fungus infection on the optics. On this occasion, the spacers were removed and reinstalled. The lens has been assembled correctly in accordance with the old spacers marks and the lens is pointing at the sky with the Crown (the element with the narrower side edge).
The only thing I'm not sure about is the thickness of the spacers, which may have suffered a bit during the entire operation. At this point, I have to tighten the collimation screws unevenly to avoid a slight coma visible on the diffraction rings with even pressure on the screws, which I think may indicate a minimal misalignment of the lenses or uneven thickness of the spacers. After adjusting the screws pressure, the uneven brightness of the diffraction rings and the rings themselves almost disappear, while a distinct Airy disk remains visible.
The image during terrestrial observations seems to be perfect in terms of precision and sharpness.