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Sander Vesik

External


Since: Oct 03, 2005
Posts: 3



(Msg. 46) Posted: Tue Oct 04, 2005 12:58 am
Post subject: Re: UV protectors on lenses [Login to view extended thread Info.]
Archived from groups: rec>photo>digital>slr-systems, others (more info?)

In rec.photo.equipment.35mm David Littlewood <david DeleteThis @nospam.demon.co.uk> wrote:
> In article <1128352344.823863 DeleteThis @haldjas.folklore.ee>, Sander Vesik
> <sander DeleteThis @haldjas.folklore.ee> writes
> >In rec.photo.equipment.35mm David Littlewood <david DeleteThis @nospam.demon.co.uk> wrote:
> >> There is a world of difference between a single moderate scratch and an
> >> overall coating of fine dust, or indeed an overall mesh of very fine
> >> scratches. The latter, often caused by incompetent cleaning, may be
> >> invisible to the naked eye, but reduce contrast significantly.
> >
> >Some 3rd party consumer lenses are AFAICT uncleanable - the coating on
> >the outside of teh front element is too soft, nd will degrade no matter
> >what you do (except not cleaing it in any way at all => always on filter
> >
> Interesting - do you have any documented data on this, or is it a
> personal observation? The range of coating materials available is not
> large, and one would expect the top coating layer to be similar in most
> cases - and of a hardness similar to the glass used. However, I do
> accept that differences in the quality of the actual coating method may
> be relevant.

No I don't - just that I have seen lens damage (at the very least) the top
layer of multicoating on the first element fairly easily while properly
cleaning it.


>
> David

--
Sander

+++ Out of cheese error +++

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Colin D

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Since: Jul 31, 2005
Posts: 12



(Msg. 47) Posted: Tue Oct 04, 2005 11:08 am
Post subject: Re: UV protectors on lenses [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

David Littlewood wrote:
>
> In article <11k2u70jns0f444.TakeThisOut@corp.supernews.com>, Jeremy Nixon
> <jeremy.TakeThisOut@exit109.com> writes
> >David Littlewood <david.TakeThisOut@nospam.demon.co.uk> wrote:
> >
> >> A technique regularly used in slide duplication - and occasionally used
> >> in normal film photography - achieves the goal you describe. This is to
> >> give a brief pre-exposure (of a fraction of the main exposure) to even
> >> white light, which lower contrast considerably.
> >>
> >> It would be quite feasible to do this in a digital camera using a small
> >> internally-directed flash.
> >
> >I don't think it would have the same effect on digital. The point behind
> >doing it with film is to lift the "base" of the exposure above the toe of
> >the film's response curve. The sensor, having a linear response, would
> >not benefit in the same way.
> >
> You are of course right about the effect on film. However, I'm not so
> sure about the part where you say the sensor has a linear response. It's
> probably true (I'm not in a position to argue) but is it the right
> question? Surely the point is that the overall system sensor ->
> amplifier -> A to D -> whatever, is restrained logarithmically.
>
> For example, if the main exposure is 1 shadow and 100 highlight, this is
> a ratio of 100:1. If an additional exposure of 10 is given overall, this
> becomes 11 shadow, 110 highlight, i.e. a ratio of 10:1
>
The downside to this technique is that it achieves the contrast
reduction almost entirely by flattening the shadow tone separation. In
your example, the shadow tones between, say, 1 and 5, have a 5:1
separation, but with the pre-flash exposure they become 11 to 16, or
1.45:1, while the highlight end is virtually unaffected.

Colin D.

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Jeremy

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Since: Sep 06, 2005
Posts: 10



(Msg. 48) Posted: Tue Oct 04, 2005 11:45 am
Post subject: Re: UV protectors on lenses [Login to view extended thread Info.]
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"Sander Vesik" <sander DeleteThis @haldjas.folklore.ee> wrote in message
news:1128387499.867140@haldjas.folklore.ee...
>> >
>> >Some 3rd party consumer lenses are AFAICT uncleanable - the coating on
>> >the outside of teh front element is too soft, nd will degrade no matter
>> >what you do (except not cleaing it in any way at all => always on filter
>> >


Check eBay listings--they are routinely described as "cleaning marks." And
nearly always followed by the suggestion that they will "probably have no
effect on the images."

There is no correct answer to the question of "to filter or not to filter."
Those of us that value keeping our front elements pristine will filter,
those that place image quality paramount will not. It just depends where
one sets his priorities.

I just hate it when the filter-free guys spread that rumor that filters were
invented and sold just as a means of increasing the profit from the sales of
lenses. Those of us that buy and use filters understand the cost and have
chosen to pay it as a form of insurance, not because we have been
manipulated by a bunch of camera dealers.
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Paul J Gans

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Since: Aug 14, 2005
Posts: 5



(Msg. 49) Posted: Wed Oct 05, 2005 2:41 am
Post subject: Re: UV protectors on lenses [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

In rec.photo.digital.slr-systems David Littlewood <david DeleteThis @nospam.demon.co.uk> wrote:
>In article <1128337548.864499.3970 DeleteThis @f14g2000cwb.googlegroups.com>, Hussam
><hktaha DeleteThis @gmail.com> writes
>>I agree that they aren't so necessary. It's classic product
>>cross-selling.. like buying the salsa with doritos. I was always super
>>extra ultra careful not to have a single spec of dust on my lenses
>>thinking it made much of a difference. Then I started using a
>>scratched Nikon lens (we're talking visible scratches here!) and
>>results were always perfect with no noticeable effect! No one would
>>ever know that the images were taken with a scratched lens.
>>
>>So worrying about a bit of dust or even a small scratch or two is just
>>being paranoid and over protective.
>>
>>We are not buying better image quality when we put UV lenses, we are
>>merely buying piece of mind... that's all.
>>
>>Sam
>>
>There is a world of difference between a single moderate scratch and an
>overall coating of fine dust, or indeed an overall mesh of very fine
>scratches. The latter, often caused by incompetent cleaning, may be
>invisible to the naked eye, but reduce contrast significantly.

>In answer to the original question, I have always taken the view that a
>top-quality lens hood has more to offer than a protective filter in most
>circumstances. It actually enhances quality by reducing flare, rather
>than degrading it (however slightly); it provides better protection
>against surface impacts, and is cheaper than the necessary top quality
>filters if you need one for every lens. They mostly keep your fingers
>off the lens glass quite well.

>The exception is in circumstances where corrosive spray (such as sea
>spray) is likely. Then I would use a filter, but at least I only need
>one per lens filter ring size (pretty well all 77 or 72mm).

>I always use the Canon bayonet fit hoods which are made of very tough
>plastic and are designed specifically for each lens. I have on several
>occasions had the hood bounce off a surface which could have otherwise
>damaged the lens. A filter would offer poor protection in such cases.

>They do though take up more room in the bag!

But are they multicoated and made by a top-flight
manufacturer?

Sorry. Couldn't resist.

------ Paul J. Gans
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Bob Hickey

External


Since: Oct 05, 2005
Posts: 1



(Msg. 50) Posted: Wed Oct 05, 2005 12:16 pm
Post subject: Re: UV protectors on lenses [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

"Jeremy" <jeremy RemoveThis @nospam.com> wrote in message
news:EXt0f.3988$Wb3.3604@trndny04...
> "Sander Vesik" <sander RemoveThis @haldjas.folklore.ee> wrote in message
> news:1128387499.867140@haldjas.folklore.ee...
> >> >
> >> >Some 3rd party consumer lenses are AFAICT uncleanable - the coating on
> >> >the outside of teh front element is too soft, nd will degrade no
matter
> >> >what you do (except not cleaing it in any way at all => always on
filter
> >> >
>
>
> Check eBay listings--they are routinely described as "cleaning marks."
And
> nearly always followed by the suggestion that they will "probably have no
> effect on the images."
>
> There is no correct answer to the question of "to filter or not to
filter."
> Those of us that value keeping our front elements pristine will filter,
> those that place image quality paramount will not. It just depends where
> one sets his priorities.
>
> I just hate it when the filter-free guys spread that rumor that filters
were
> invented and sold just as a means of increasing the profit from the sales
of
> lenses. Those of us that buy and use filters understand the cost and have
> chosen to pay it as a form of insurance, not because we have been
> manipulated by a bunch of camera dealers.
>
> I havn't done a whole lot of filter research, but I shoot a lot at
the beach in the winter. And I can't believe that fine sand blowing around
isn't going to damage everything. It ruins windshields, takes paint off
everything, and I know it destroys filters. It's a lot easier to wash a
filter under the sink and throw it away when it's done than waste a lens
every week. Bob Hickey.
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Gianni Rondinini

External


Since: Sep 19, 2003
Posts: 1



(Msg. 51) Posted: Mon Oct 10, 2005 12:12 pm
Post subject: Re: UV protectors on lenses [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

On 2 Oct 2005 10:58:46 -0700, "Bala Variyam" <bala.variyam.DeleteThis@gmail.com>
wrote:

>Hi,
>
>I have got a UV protector on all my lenses to protect the lens surface
>from scratches/dust/etc. Is it a best practice to remove the UV

i use b+w uv-haze filters on all my lenses and there is *no*
difference in photos with or without the filter.

with el-cheapo filter sometimes you see some quality loss.

regards,
--
Gianni Rondinini (30, tanti, RA)
VBR - Vero Birro Romagnolo
Hai capito, scelf?
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Randall Ainsworth

External


Since: Jul 30, 2005
Posts: 36



(Msg. 52) Posted: Fri Oct 14, 2005 5:57 am
Post subject: Re: UV protectors on lenses [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

In article <1128322129.424777.DeleteThis@haldjas.folklore.ee>, Sander Vesik
<sander.DeleteThis@haldjas.folklore.ee> wrote:

> Ever seen a defect resulting from reflections from the UV (or any other)
> filter?

The only thing that should be in front of the lens is the subject.
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Bob Salomon

External


Since: Aug 09, 2005
Posts: 20



(Msg. 53) Posted: Fri Oct 14, 2005 11:37 am
Post subject: Re: UV protectors on lenses [Login to view extended thread Info.]
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In article <141020050557588213%rag@nospam.techline.com>,
Randall Ainsworth <rag.DeleteThis@nospam.techline.com> wrote:

> In article <1128322129.424777.DeleteThis@haldjas.folklore.ee>, Sander Vesik
> <sander.DeleteThis@haldjas.folklore.ee> wrote:
>
> > Ever seen a defect resulting from reflections from the UV (or any other)
> > filter?
>
> The only thing that should be in front of the lens is the subject.

Especially when it is windy or you are by sand, snow, rain, smoke,
peanut butter and jelly sandwiches, beer parties, pillow fights,
camping, etc.

--
To reply no_ HPMarketing Corp.
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Cynicor

External


Since: Aug 26, 2005
Posts: 1



(Msg. 54) Posted: Fri Oct 14, 2005 12:10 pm
Post subject: Re: UV protectors on lenses [Login to view extended thread Info.]
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Bob Salomon wrote:
> In article <141020050557588213%rag@nospam.techline.com>,
> Randall Ainsworth <rag RemoveThis @nospam.techline.com> wrote:
>
>
>>In article <1128322129.424777 RemoveThis @haldjas.folklore.ee>, Sander Vesik
>><sander RemoveThis @haldjas.folklore.ee> wrote:
>>
>>
>>>Ever seen a defect resulting from reflections from the UV (or any other)
>>>filter?
>>
>>The only thing that should be in front of the lens is the subject.
>
>
> Especially when it is windy or you are by sand, snow, rain, smoke,
> peanut butter and jelly sandwiches, beer parties, pillow fights,
> camping, etc.

I was lucky to have the UV filter and lens hood attached when I was
photographing ice hockey last weekend. Disaster averted.
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Randall Ainsworth

External


Since: Jul 30, 2005
Posts: 36



(Msg. 55) Posted: Fri Oct 14, 2005 6:35 pm
Post subject: Re: UV protectors on lenses [Login to view extended thread Info.]
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In article <bob_salomon-C22DE1.11375814102005.DeleteThis@news.isp.giganews.com>,
Bob Salomon <bob_salomon.DeleteThis@mindspring.com> wrote:

> Especially when it is windy or you are by sand, snow, rain, smoke,
> peanut butter and jelly sandwiches, beer parties, pillow fights,
> camping, etc.

This summer I took pictures at the beach, on the side of Mount Rainier,
in museums, in foggy conditions, at the base of large and small
waterfalls - still didn't need some piece of glass in front of the lens
to muck up the image.
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newspam

External


Since: Nov 14, 2004
Posts: 4



(Msg. 56) Posted: Sat Oct 15, 2005 8:54 am
Post subject: Re: UV protectors on lenses [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

I've always used a good-quality UV lens on my SLR, along with a lens hood
suitable for the size/angle of lens (to avoid vignetting)

Cleaning then becomes a piece of cake since its easier to clean a the filter
than the front lens element.

The only time I might remove it is when taking a sunset where the sun is in
the frame - and then it depends on what see in the viewfinder (i.e.
reflections etc)

"Randall Ainsworth" <rag.RemoveThis@nospam.techline.com> wrote in message
news:141020050557588213%rag@nospam.techline.com...
> In article <1128322129.424777.RemoveThis@haldjas.folklore.ee>, Sander Vesik
> <sander.RemoveThis@haldjas.folklore.ee> wrote:
>
>> Ever seen a defect resulting from reflections from the UV (or any other)
>> filter?
>
> The only thing that should be in front of the lens is the subject.
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Roger

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Since: Oct 09, 2005
Posts: 3



(Msg. 57) Posted: Sat Oct 15, 2005 2:56 pm
Post subject: Re: UV protectors on lenses [Login to view extended thread Info.]
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On Fri, 14 Oct 2005 18:35:12 -0700, Randall Ainsworth
<rag.DeleteThis@nospam.techline.com> wrote:

>In article <bob_salomon-C22DE1.11375814102005.DeleteThis@news.isp.giganews.com>,
>Bob Salomon <bob_salomon.DeleteThis@mindspring.com> wrote:
>
>> Especially when it is windy or you are by sand, snow, rain, smoke,
>> peanut butter and jelly sandwiches, beer parties, pillow fights,
>> camping, etc.
>
>This summer I took pictures at the beach, on the side of Mount Rainier,
>in museums, in foggy conditions, at the base of large and small
>waterfalls - still didn't need some piece of glass in front of the lens
>to muck up the image.

I never purchase a lens without purchasing a good UV filter as well.
When I say good, they aren't cheap and do not degrade the image.
Usually if any distance or sky is involved they improve it. They make
a tremendous difference on landscapes. Even my large telephotos have
them.

Over the years I've had UV filters save two expensive lenses. In one
case the camera was dropped and in the other the lens was hit by
something as I was carrying it. In both cases the filters were
destroyed. One was driven right down into the filter ring on the lens,
but did not ruin the ring.

Still, I find they improve the type of shooting I do, some of which is
aerial photography. There they make the difference of night and day.
Polaroid filters also work well up there, "most of the time".

Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com

Roger
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Jeremy

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Since: Sep 06, 2005
Posts: 10



(Msg. 58) Posted: Sat Oct 15, 2005 4:00 pm
Post subject: Re: UV protectors on lenses [Login to view extended thread Info.]
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"Randall Ainsworth" <rag.RemoveThis@nospam.techline.com> wrote in message

>
> This summer I took pictures at the beach, on the side of Mount Rainier,
> in museums, in foggy conditions, at the base of large and small
> waterfalls - still didn't need some piece of glass in front of the lens
> to muck up the image.

You are entitled to your opinion, but many of us prefer the added protection
afforded by filters. I've never noticed my filters mucking up my images.
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Randall Ainsworth

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Since: Jul 30, 2005
Posts: 36



(Msg. 59) Posted: Sat Oct 15, 2005 4:00 pm
Post subject: Re: UV protectors on lenses [Login to view extended thread Info.]
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In article <DI94f.1238$W32.1114@trnddc06>, Jeremy <jeremy RemoveThis @nospam.com>
wrote:

> You are entitled to your opinion, but many of us prefer the added protection
> afforded by filters. I've never noticed my filters mucking up my images.

One man's ceiling is another man's floor.
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Bill

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Since: Sep 16, 2005
Posts: 19



(Msg. 60) Posted: Sat Oct 15, 2005 10:31 pm
Post subject: Re: UV protectors on lenses [Login to view extended thread Info.]
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