UV ghostless filter

Just picked up a 49m UV filter for my 50m smc M 1.4 lens, on opening it the words ghost less appear on the rim.

The filter appears to display curvature on the glass, it is in excellent condition does it cause any issues with the lens

The ghostless filters are, I believe, of the M42 Takumar era and were curved to do exactly that, be ghostless. To be effective the curve should be the same (?ish) as the front element. I doubt the M50/1.4 is the same, but it is probably close enough as to make little difference. Try taking a series of shots with and without and see what happens?

Merry Christmas, Kris.

Why oh why do people waste their money on supposed UV filters?

Most glass absorbs all but the longest wavelength UV light (UV-A). What are our lenses made from? Yes, glass.

Ever wondered why you don't get sunburnt while driving your car? UV light is what causes sunburn, and UV light doesn't pass through the glass. Your reactolite lenses in your glasses don't 'react' either, for the same reason.

The glass, adhesive resins, and coatings of camera lenses, even old ones, are very effective at preventing most UV light from reaching the film, and DSLR sensors are less sensitive to UV anyway.

Why bother, there must be something more useful to spend money on.

The UV filter was originally intended to cut through haze. Haze is caused by the scattering of blue light by water droplets in the atmosphere. This reduces distance clarity before any light gets to the lens.

The UV filter removes the affected light and allows us to see better into the distance.

Filters are only really useful now for these sort of applications, where the effect we want to remove happens before the light reaches the lens. A polariser is another example.