Use of clear filters to protect RPP's

[Vladimir Eugene]

I know they use them for still lenses, but for use with prime cine lenses,

1. Is that something that is done

2. If it is done, and recommended what type and size filter would I get for the RPP's

any info on this would be appreciated.

thank you,

vlad

[David Mullen ASC]

A clear optical flat is used in front of a lens to protect it in scenes where something might hit the lens, like during a squib or explosion or when something is being thrown around... but otherwise, it is not typical to put a glass filter in front of a cine lens all the time just to protect it.

But if you did, you'd want to remove it whenever you already were using a glass filter anyway (like an ND, Pola, or diffusion, etc.) just to minimize double-reflection problems.

If you own the lens, you're free to do whatever you want to protect it though.

[Brent J. Craig]

If you are going to put a protective filter in front of high-end cine glass (which is not normally done, except in the situations David mentions), please do yourself a favor and use good quality multi-coated filters.

I recently replaced the protective filters on my stills lenses with multicoated UV filters and saw a very noticeable improvement in image quality.

If you're going to put cheap glass in front of good lenses, especially that window glass that some suppliers sell, you might as well just use crappy lenses to start with.

[Kar Wai Ng]

For the RPPs, you would need a 105mm screw-in filters. I would use B+W MRC filters; they are probably the best multicoated filters you can get, up there with Heliopan. They also happen to be quite easy to clean since they repel liquid, unlike the multicoated Hoyas which tend to smear. I have B+W MRC filters and polas for my still lenses.

B+W is essentially a division/brand of Schneider Optics, which of course in the cine world makes top-notch filters. I only wish cine filters were multi-coated...it seems odd to me that given how often we stack filters in motion picture use that we still use uncoated filters.

[Brent J. Craig]

I only wish cine filters were multi-coated...it seems odd to me that given how often we stack filters in motion picture use that we still use uncoated filters.

Exactly! I have wondered the same thing.

[KETCH ROSSi]

I know they use them for still lenses, but for use with prime cine lenses,

1. Is that something that is done

2. If it is done, and recommended what type and size filter would I get for the RPP's

any info on this would be appreciated.

thank you,

vlad

Hey Vlad, how have you been my friend :)

I consider the use of a clear protective filter a absolute necessity in more then one instance, and it has saved the glass more then once!

This is the one I always use for all my Glass http://www.schneideroptics.com/ecomm...D=768&IID=3992 and remember that I still offer a considerable discount to REDUSERS http://reduser.net/forum/showthread.php?t=6665

Definitely do go with a Multi Reflective Coating type, even if you didn't go with this particular one, and also do get the UV HAZE kind, as it offers a good results against Haze, nice to have a clearer image.

It is however true that there is not only no need to have this type of screw in filter in Cine lenses when used with other filters, but even in Still lenses this are removed when other filters are added, both to avoid unnecessary stacking and to stay away from the possibility of adding any flair, vignetting etc.

But I not only suggest to put the Clear filter on when shooting water splatters, or shooting in the rain, with only the outer of the lens and body of the camera protected by a rain cover, and or when filming up close any type of FX shot were they might be any splash of any kind of liquid, but I would leave it on all the time when not in use, and leave it on when in use, unless I was to add any additional filters, but even when shooting Run and Gun with no other filters, or in Photography applications, I would also leave it on, all the time, and again only removing IT only of replaced by an other filter.

This is off course my opinion and preference to preserve the Glass I own,not rent, and it has served me well with all my glass for over twenty years, even if majority was still glass, some of my Canon Super telephoto were 8k each, so definitely in need of protection :)



ciao

[Vladimir Eugene]

Thanks guys, I had someone ask me that recently and I realized I didn't know my options.

Your input was very helpful.

vlad

[Vladimir Eugene]

Hey Vlad, how have you been my friend :)

ciao

I'm doing well Ketch. I'll give you a call soon. I'd like to catch up.

vlad