10 votes

What happens if anti-reflective coating is fully ruined or removed from lens' most outer surface?

Up until the late 1940s and into the 1950s, camera lenses didn't have coatings. The result was much higher incidence of lens flare and reduced contrast in the presence of bright light sources. ...
osullic's user avatar
  • 12k
7 votes
Accepted

Can a lens's MgF2 anti-reflective coating be damaged by salt water?

Short version : stop the madness. Keep your lens out of salt water. Period. Salt water is corrosive and fairly close to the worst thing you can get on a lens. Submerging any lens is an appallingly ...
StephenG - Help Ukraine's user avatar
6 votes

Do nano coatings actually make a difference?

This isn't just one company creating their own buzz, and corresponding buzzword, for marketing purposes. This has been an important advance in optics in general over the last 15-20 years. The ...
scottbb's user avatar
  • 32.5k
5 votes

two identical lenses with different coatings

The coatings do not have a color and do not wear out with exposure to sunlight... it's also highly unlikely to be a manufacturing tolerance/variable issue IMO (although that is possible). It's quite ...
Steven Kersting's user avatar
5 votes

Do nano coatings actually make a difference?

The first question would be: "...a difference compared to what?" Most camera lenses have been multicoated for decades now. Before that (from around the '50s to the '70s) they were single coated. ...
Jerry Coffin's user avatar
  • 19.3k
4 votes

What happens if anti-reflective coating is fully ruined or removed from lens' most outer surface?

Anti-reflective coatings are used to reduce reflections on glass-air and glass-glass surfaces. These reflections, if not suppressed, can lead to light loss, secondary images (lens flares) or glare, ...
Graumagier's user avatar
4 votes

What happens if anti-reflective coating is fully ruined or removed from lens' most outer surface?

About lens coating: Optician Harold Dennis Taylor observed that older lenses on the shelf passed more light than new ones of identical design. He investigated and discovered that the older lenses ...
Alan Marcus's user avatar
  • 38.9k
3 votes

Do "water repellent" coatings such as the Hoya HD3 or EVO filters prevent condensation/dew?

Since you placed an astrophotography tag on your question, I'll assume you are experiencing fogging while shooting the night skies. You'll get fogging/beading even with hydrophobic coatings as ...
qrk's user avatar
  • 2,851
3 votes

Why is anti-reflective coating on front surface of lens or filter? How can it works?

A front surface coating does a few useful things. First, contrary your understanding, it does increase transmission. An uncoated glass surface reflects about 4% of the light that passes through it (...
Zeiss Ikon's user avatar
  • 7,141
3 votes
Accepted

What is the best way to clean internal lens elements?

The coating was probably already damaged by the fungus, not the alcohol. Though you should consider using a lower concentration (70-90%) like a normal person. PetaPixel: How to Remove Fungus from a ...
xiota's user avatar
  • 27k
3 votes

Why does Canon have Two Kinds of Nanotech Lens Coatings?

It seems Canon has developed different coating technologies for different applications instead of trying to force a "one size fits all" solution on all of their premium lenses. As far as I ...
Michael C's user avatar
  • 175k
3 votes
Accepted

Which lens coatings reduce internal reflection?

Lens coatings vary on a lens model by lens model basis. There are quite a few different models of the Pentax Super Takumar 50mm f/1.4. Some had 8 lens elements, some had 7 lens elements. Some had 6 ...
Michael C's user avatar
  • 175k
3 votes

Does it make sense for an ND filter to be less reflective on the front than the back?

I think you may be confusing the function of two different coatings. A Protectant Coating can be single or multi-layer. MRC simply means that there are multiple layers of protectant. In Fact, B+W's F-...
PhotoScientist's user avatar
2 votes

Will a vintage lens with worn lens coating create poor images?

The purpose of lens coating is to increase the light transmission of a lens. About 3% to 5% light is lost on a lens element due to reflection off the glass (polished surface). To mitigate a super thin ...
Alan Marcus's user avatar
  • 38.9k
2 votes

What happens if anti-reflective coating is fully ruined or removed from lens' most outer surface?

As others have said the outer coating will be a hard coating and quite robust - it would take some abrasion or strong chemicals to remove it. With modern coatings it may be harder than the lens glass ...
John's user avatar
  • 564
2 votes

How much have tele-prime lenses improved over the years?

A more general question, are older telephoto lenses a lot worse than their new counterparts or are the improvements not completely on image quality but more on usability (AF, VR, etc)? It depends ...
Michael C's user avatar
  • 175k
2 votes

What is the best way to clean internal lens elements?

Some hints from someone who dabbled in it: -Invest in some actually dust and lint free paper towels for drying things. It's good for your sanity. -Contact lens lifters are very helpful in handling ...
rackandboneman's user avatar
2 votes
Accepted

What coating do old non-HMC Hoya filters have?

"Multi-coated" doesn't primarily reference a filter that has a coating on more than one side. It means each coated surface has multiple coating layers on the same surface. Each of these multiple ...
Michael C's user avatar
  • 175k
2 votes

Does it make sense for an ND filter to be less reflective on the front than the back?

As you know, the motivation to coat a lens / filter is to increase light transmission. Uncoated glass suffers a loss of about 3 to 5% percent due to reflection from their polished surface. In a multi-...
Alan Marcus's user avatar
  • 38.9k
2 votes
Accepted

Do "water repellent" coatings such as the Hoya HD3 or EVO filters prevent condensation/dew?

Condensation is only an issue if the glass is much colder than the surrounding air, until your reach dew-point. Dew point is humidity-related & seasonally-variable, but you could roughly call it 4°...
Tetsujin's user avatar
  • 23.2k
1 vote

Why is anti-reflective coating on front surface of lens or filter? How can it works?

The British Physicist (Nobel Prize) John William Strutt, 3rd Baron Rayleigh, in 1886 discovered that old lenses on the shelf passed more light than new ones of the same design. Carrying on, the ...
Alan Marcus's user avatar
  • 38.9k
1 vote
Accepted

How to remove these marks or stains on the coating caused by fungus?

There's no way to remove something that isn't there. The fungus has etched away part of the coating or even the glass itself. It's gone.
Michael C's user avatar
  • 175k
1 vote

Protect action camera lens from water drops

Probably what you are looking for is: Hydrophobic coating. There are some denominated superhydrophobic. Where water droplets literally bounce like rubberball. One problem is that I have not found any ...
Rafael's user avatar
  • 24.5k
1 vote

Protect action camera lens from water drops

If the lens is uncoated, the thinnest, and least obscuring, coating would be windshield rain repellent, e.g., Rain-X or GlasShield. That said, any coating will reduce sharpness somewhat, though it ...
DrMoishe Pippik's user avatar
1 vote

two identical lenses with different coatings

The English optician Harold Taylor and Physicist John Strutt independently observed that aged lenses transmitted 4 to 6% more light than new ones. Taylor went on to experiment and artificially aged ...
Alan Marcus's user avatar
  • 38.9k
1 vote

two identical lenses with different coatings

I would like to know what they have changed and why. I guess it is possible that Nikon modified the coating of the lens model between production runs, but I think it would be highly unlikely. My ...
Michael C's user avatar
  • 175k

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