amfoto1 wrote:
Trying to figure out how the hardness of glass vs plastic applies to this discussion.... whether you are arguing for or against using a filter for "protection".
A high impact plastic lens hood or lens cap can take a pretty hard hit and survive, absorbing shock and preventing damage to the lens itself (evidence... most of my lens hoods and caps).
Sure, the glass of a filter is harder than any plastic. But does that provide more protection... or less? Tap one lightly with a hammer and see what happens. Now tap a high impact plastic lens hood or lens cap the same way with the same hammer. Which survived better?
Next, rub your thumb over the filter you just shattered with a hammer tap. Feel kinda sharp? Imagine what that sharp, hard edge will do to the coatings on the front of your lens, if driven into it.
Trying to figure out how the hardness of glass vs ... (
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WAIT!.....WHAT?Well, YOU are changing the discussion from what the Troll had suggested ...
I am not saying that there may not be as-great-or-greater benefit from using a lens hood
at times ...
Perhaps I have to reiterate what the Troll who claims to be a "scientist" said that "
even the CHEAPEST plastic lens is harder than the best protective filter."
Beginning an analysis with an inaccurate premise seems UN-scientific ...
So, while you may not feel that invalidating the Troll's premise is a valid point for me/someone to make, I feel that it was.
FWIW. It seems that people who are
anti-filter often like to introduce an apples-and-oranges comparison ... that is, catastrophic vs. non-catastrophic ...
To counter your close-to-
non-sequitar "hammer" example, let me ask you if you have ever known an adult St. Bernard?
If you have never encountered an adult St. Bernard then let me advise you that MY observation is that an adult St. Bernard will generally move through space as if it were still a puppy ...
While having an adult St. Bernard brush past you is certainly not as hard an
impact as being hip checked while playing hockey, if you aren't expecting it then you may be momentarily thrown off balance.
Similarly (?), is it not possible to bump the front of a lens whose length is extended by a hood on an occassion when a hoodless lens might not receive a lateral impact?
Of course it is.
I believe the issue of using a "clear" filter (beyond color filters with panchromatic B&W film) is
to protect the lens from scratches and/or unnecessary wiping of the lens's outer surface -- that is, NON-catastrophic contact.
Now, I have
not done a "Snell" impact test on a lens filter (
and, the filter's diameter will certainly have an effect on the "results"), but I reckon that if you want to compare a catastrophic event which can shatter a lens filter (
say a 49mm-or-52mm filter) enough so that there are shards then you will have also shattered most plastic lens hoods to the point where SOMETHING would have then possibly made contact with the front element and/or minimally damaged the lens's threaded collar.
For the record, have you tried your hypothetical "hammer" test?
I would guess not.
So, why don't you actually try YOUR "hammer" TEST on both a glass filter & a lens hood AND THEN report back rather than shooting-from-the-hip what you think might occur?!?
amfoto1 wrote:
Please prove your statement. (Hint: you can't.)
Having shot for going on 40 years now, with and without filters, and as a collector with a few hundred cameras and filters, and as a repairer who has worked on more than a few cameras and lenses... even I can't prove it one way or another. But I have 100 year old lenses that are as good as they day they were new, never had a filter on them that I'm aware of. And I've seen a few lenses that were essentially unrepairable due to damage FROM broken filters (unrepairable = too costly to be practical and/or necessary parts unavailable).
At the same time, I've seen numerous image examples showing how filters can have negative effects on IQ. Maybe I'll buy some cheap filters and do some test shots some day, to have comparison.
Do whatever makes you happy and will encourage you to get out and shoot with your gear. Just be aware of the risks to images and even to your lenses. If you choose to use "protection", I would recommend steering well clear of $10, $15 and $25 filters (those are best used as air hockey pucks or for skeet shooting targets). Cheap filters can trash your images badly...increasing flare, reducing contrast and color saturation, adding "ghosts", even blurring detail and adding chromatic aberrations. So spend the money to get quality multi-coated B+W, Hoya, Marumi, Schneider, Heliopan, etc. Those will have minimal negative impact on your images most of the time.
Me, I choose not to use a protection filter much of the time, though I have good ones handy and I'll install one when it makes sense to do so (i.e., in a sand storm, at the beach, or if photographing a paint ball contest, wet-nosed puppy or sticky fingered 2 year old).
Please prove your statement. (Hint: you can't.) br... (
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WOW!
..... WELL, LUCKY YOU?!?I cannot speak for
John_F, but ...
I have certainly seen lenses which would have been protected from being badly scarred (
i.e., scratched) ...
And, filter rings which have been bent severely enough that a plastic collar would probably have been cracked ... but, FYI, the glass inside the filter ring was undamaged.
And, I have certainly seen lenses whose coating has been degraded by repeated cleanings.
BTW (
I'm adding on because YOU added on to your original reply). I do not know how Canon's current Zoom lenses compare with Nikon's current Zoom lenses, but I can tell you from first hand experience that Nikkor lenses were generally sharper than their Canon FL/FD counterparts ...
.........................THAT is just my personal experience, and your's may be different
.........................AND the remark is NOT meant to start a Nikon-Canon/
-whatever argument ...
.........................There are many great lenses from many lens manufacturers.
Regardless, as
I previously indicated, one would think that if YOU-or-anyone-else were trying to achieve superior Image Quality and if YOU were truly concerned about the possible negative effects of having ANY filter in front of your lens, then you would NOT be using ANY of your Zoom lenses (regardless of how sharp you think they may be) & YOU would rarely-if-ever use the camera's auto-focusing capabilities RATHER THAN worry so much about an extra piece of glass in front of the camera's lens whose possible negative effect is considered to be negligible by almost everyone else.