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Author Topic: Just Why  (Read 2753 times)

Q8-MC

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Just Why
« on: May 01, 2013, 04:17:22 PM »
Hello there,

I have just on question. Why the Super Telephoto lens doesn't have UV filter?

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Just Why
« on: May 01, 2013, 04:17:22 PM »

Drizzt321

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Re: Just Why
« Reply #1 on: May 01, 2013, 04:22:15 PM »
??

No lens (at least today) comes with a UV filter, you need to buy them yourselves. As for the super telephoto lenses, they do, it's just a filter that's dropped in close to the lens mount rather than all the way on the front of the lens like smaller lenses. I shudder to think of the cost for a filter that size.
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neuroanatomist

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Re: Just Why
« Reply #2 on: May 01, 2013, 04:31:03 PM »
Just why do you think it needs one? 

dSLR sensors are insensitive to UV light. If you really want one (maybe you're shooting film?), there's a drop-in holder for gelatin filters that comes with the lens, and a different one sold separately for screw-in 52mm filters.

If you mean a front filter for protection, the old superteles had a protective meniscus lens (thin, non-refracting, relatively cheap to replace).  They removed it from the new MkII versions to save weight. The hoods for those lenses are very deep and offer substantial protection.

A screw-on filter of that size would be incredibly difficult to produce. Compare 82mm filter costs to 58mm filters - the difference in materials cost is minimal, you're paying for the precision to make the two surfaces perfectly flat (which is harder than making curves surfaces) and parallel - that need for precision goes up exponentially with diameter, and a 600/4 would need a >150mm front filter.
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bseitz234

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Re: Just Why
« Reply #3 on: May 01, 2013, 04:53:13 PM »
Just why do you think it needs one? 

dSLR sensors are insensitive to UV light. If you really want one (maybe you're shooting film?), there's a drop-in holder for gelatin filters that comes with the lens, and a different one sold separately for screw-in 52mm filters.

If you mean a front filter for protection, the old superteles had a protective meniscus lens (thin, non-refracting, relatively cheap to replace).  They removed it from the new MkII versions to save weight. The hoods for those lenses are very deep and offer substantial protection.

A screw-on filter of that size would be incredibly difficult to produce. Compare 82mm filter costs to 58mm filters - the difference in materials cost is minimal, you're paying for the precision to make the two surfaces perfectly flat (which is harder than making curves surfaces) and parallel - that need for precision goes up exponentially with diameter, and a 600/4 would need a >150mm front filter.

Come on, Neuro, you don't want to throw B+W a $750 bone after paying $13k for that 600? ;-)
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neuroanatomist

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Re: Just Why
« Reply #4 on: May 01, 2013, 06:00:29 PM »
Not without filter threads on the front of the lens...   :P
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DJL329

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Re: Just Why
« Reply #5 on: May 01, 2013, 07:50:03 PM »
Not without filter threads on the front of the lens...   :P

Oh, come on.  Just be a man and duck tape it!   ;D

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neuroanatomist

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Re: Just Why
« Reply #6 on: May 01, 2013, 08:09:26 PM »
Too much vignetting. I'd need to be able to lift those shadows by at least 5 stops - anyone know of a camera with enough DR for that??   ::)  ???  :-X
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Re: Just Why
« Reply #6 on: May 01, 2013, 08:09:26 PM »

vuilang

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Re: Just Why
« Reply #7 on: May 01, 2013, 09:13:26 PM »
Too much vignetting. I'd need to be able to lift those shadows by at least 5 stops - anyone know of a camera with enough DR for that??   ::)  ???  :-X

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eml58

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Re: Just Why
« Reply #8 on: May 01, 2013, 10:31:12 PM »
Too much vignetting. I'd need to be able to lift those shadows by at least 5 stops - anyone know of a camera with enough DR for that??   ::)  ???  :-X

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neuroanatomist

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Re: Just Why
« Reply #9 on: May 01, 2013, 10:35:15 PM »
... the threads about to go to hell in a hand basket

UV filter on a supertele?!?  I think this thread started there, actually.   :P
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yogi

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Re: Just Why
« Reply #10 on: May 01, 2013, 10:53:25 PM »
You might want to ask michael about that ;).  Or not ::).
Too much vignetting. I'd need to be able to lift those shadows by at least 5 stops - anyone know of a camera with enough DR for that??   ::)  ???  :-X

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Re: Just Why
« Reply #11 on: May 01, 2013, 10:58:18 PM »
Sorry, I did mention his name. Should I start popping corn? Are you baiting him? Will I get a warning also? To be continued.....

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Re: Just Why
« Reply #11 on: May 01, 2013, 10:58:18 PM »