product photography – How to reduce reflections on flat lay mirrored sunglasses?

Besides setting up your lighting correctly, you can also use a polarizer filter to reduce unwanted reflections and to reveal the actual color of the glasses.

The polarizer filters that can be found nowadays are screw-on “circular polarizers”. They are easy to use: you simply turn the front ring to selectively throw away the right (amount of) reflections (the same way you would rotate a variable ND filter to reduce exposure, if you are familiar with that).

polarizer – Polarizing filter – degree of polarization vs polarizing sunglasses?

The bulk of polarizing filters these days for photographic purposes are so-called “circular polarising filters”, in brief CPL. They consist essentially of a proper linear polariser and a “quarterwave plate” that “scrambles” the polarised light in order to make it mostly unpolarised again. The reason is that parts of camera optics particularly in SLR and DSLR, like beam splitters, phase-based autofocus, separate exposure meters, analog TTL flash metering will fail to work reliably with polarised light.

The quarterwave plate is not perfect but good enough for those purposes. As a result, CPL filters have a “polarised” and an “unpolarised” side in a manner of speaking, with the polarised side turned to the scene and the unpolarised turned to the camera.

For any purposes intended to try blocking light, you thus need to place CPL filters with their front sides facing each other or with the front side turned to (say) a laptop screen.

If you instead use the backside, the polarised light will first get depolarised by the quarterwave plate and then half of it gets blocked by the polariser plate. Since “depolarisation” is not perfect except for a single wavelength of light, you’ll get various hues by rotating the filter then, but no blockage. Orienting it the other way should give you the expected blockage on certain angles.

Polarizing filter – degree of polarization vs spolarising sunglasses?

I thought a polarizing filter only lets thru light of one polarity.

Thus if I have 2 polarizing sunglassses and look thru both superimposed and rotate one it should completely block light at 90 degrees rotation. I’ve tried this and it works.

However, I have two of Massa lens polarizing filters and they only slightly reduce the light when thus superimposed and rotated. I complained to Massa and they claimed two superimposed filters rotated 90% should block the light.

Looking on youtube I saw that viewing the filter against a computer monitor, it will block the light completely when rotated if it is a good filter eg Hoya filter was shown to do exactly this.

Does this mean that the Massa filters are defective? If not, are many so called polarizing filters (other than Hoya), this bad at polarizing compared to polarizing sunglasses or can I get ones that polarize 100%?

I checked a similar topic but it does not look at the degress of polarizing affected:
How do I choose a polarizer?

f stop: how is the ND filter value of gray sunglasses and colored sunglasses calculated?

I had the idea of ​​using my sunglasses as an ND filter when F / 16 didn't help in a beach scene with my MC 2500, but then I noticed something strange. My Ray Ban green sunglasses ensure that they block 85% of visible light, but the landscape was not as dark as I expected.

So. If the claimed number of eighty-five percent is true. What is the ND number and F stop reduction of Ray Ban Cockpit sunglasses with G (reen) 15 lenses along with their polarizing variant? What makes it quite complex is how it intends to eliminate all blue light and it becomes even more jarring when I think of brown lenses from my O Marines that eliminate the green color that has twice the sensitivity in Bayer-patterned cameras.

So basically. How are the ND values ​​of colored and non-colored lenses calculated?

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How to choose your sunglasses?

First factor to consider: the shape of your face! Whether you have a round, square or oval head, you must choose the appropriate lenses.

What sunglasses for a round or oval face?
Your face is round? So do not accentuate your shape with round glasses Better break the roundness of your boil with a geometric pattern. In addition, the thin branches will lengthen your face, always in the optics to limit the round appearance of your facies!
Having an oval face is a lot like taking the jackpot in the lottery! Yes, almost all styles of binocles will fit perfectly. You can even push the vice and take you to the most eccentric and original models! How far will your pellet go?

Are you looking to choose your beard style according to your face? Take a look at our article: "What style of beard for a round, square or oval face?"

The elongated hoes are a bit like an intermediary at the crossroads of different profiles. Therefore, a wide range of sunglasses is possible, although the rounded style will remain the preferred one. Side branches, we will focus more on quite large parts: you will avoid focusing on the length of your

If you are lucky enough to have a square face, do the opposite of the tips for round heads! Clearly, forget the geometric shapes that only highlight the angular aspect of your features. Mount the level, choose instead a wide model, to reduce the size of your face! On the contrary, it is better to choose branches thin enough so as not to enlarge the head.

This is not necessarily the first thing you think about when choosing your Sunglasshutusa lenses. And yet, your cut is also important … to determine the size of your binocles!

Are you rather the mane until the knees or the cut of brush? Knowing it, the length of your hair is taken into account when choosing your sunglasses! If you have a shortcut, let yourself be tempted by a small model, with thin branches. History not to contrast! Do you have an overflowing hair in your head? It's the opposite ! A large amount of volume in the tifs will lead you to choose awesome binoculars. Finally, if you are between the two, you are the freedom of optics!

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My new titanium sunglasses!