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meanwhile
Joined: 29 May 2014
Posts: 225
Location: Australia
Expire: 2016-11-28
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 Posted: Thu May 28, 2015 3:20 am Post subject: UV Filter Question - Not the normal one!! :-) |
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meanwhile wrote:
Given that a lot of older legacy lenses don't have coatings that are as good as those out now, I was wondering if anyone has tried adding filters such as the Zeiss T* Coated UV filters to single coated or otherwise coating-compromised lenses, and does it make a difference (contrast/flare/etc)?
They are expensive, but so are the newer and better MC lenses in some lines.
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ZoneV
Joined: 09 Nov 2009
Posts: 1633
Location: Germany
Expire: 2011-12-02
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| Posted: Thu May 28, 2015 4:50 am Post subject: |
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ZoneV wrote:
I read this as a recomenndation, but it is nonsense for avoiding flare.
It sure can make sense to protect the lens from dust, humidity, small impacts. For heavy impacts I suppose the lens is more stable as the filter. The later can break and scratch the lens.
The filter ring itself can reduce some stray light / flare simple because it acts like a small hood.
On a lens with no coating much (~4% vor vertical incident, with larger incident angle more) light is reflected back to the object and surroundings. Even a very good coated filter will reflect some of this light back into the lens. Without the filter there is no such wrong reflection.
So for stray-light / flare reduction you better buy the filter, remove the glass, and use the filter-ring as a small hood 
Or buy a real hood and use it.
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calvin83
Joined: 12 Apr 2009
Posts: 7554
Location: Hong Kong
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| Posted: Thu May 28, 2015 4:57 am Post subject: |
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calvin83 wrote:
Like what Markus said, hood in the front or baffle on the back of the lens can reduce stray-light. Filter is more suited as a protector.
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DConvert
Joined: 12 Jun 2010
Posts: 902
Location: Essex UK
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| Posted: Thu May 28, 2015 9:09 am Post subject: |
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DConvert wrote:
UV filters make good sence for film which is sensitive to UV. Digital is not so they won't be any help for that.
Even the best multi coating on the filter won't change the reflections in the lens so no gain there either.
An extra surface further foreward is more likely to catch light from the side, increasing the chance of flare.
Last edited by DConvert on Thu May 28, 2015 9:53 am; edited 1 time in total |
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meanwhile
Joined: 29 May 2014
Posts: 225
Location: Australia
Expire: 2016-11-28
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| Posted: Thu May 28, 2015 9:41 am Post subject: |
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meanwhile wrote:
All good info, thank you. I was speaking more to specific coating such as the T* coating, rather than just generic UV filters as such. Maybe there's not really any difference between them, if not, excellent, I can buy another lens instead of a filter. 
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In my bag: Sony A7II - Olympus OM 21mm f/3.5 - Minolta M-Rokkor 40mm f/2.0 - Konica Hexanon 57mm f/1.2 AR - Olympus Zuiko OM 100mm f/2.8 - Pentax 135mm f/3.5 |
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DConvert
Joined: 12 Jun 2010
Posts: 902
Location: Essex UK
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| Posted: Thu May 28, 2015 10:02 am Post subject: |
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DConvert wrote:
| meanwhile wrote: |
| All good info, thank you. I was speaking more to specific coating such as the T* coating, rather than just generic UV filters as such. Maybe there's not really any difference between them, if not, excellent, I can buy another lens instead of a filter. |
If you need to have a filter, the better coating will reduce the problems the filter adds, and perhaps ease cleaning.
Given the price of top filters you could probably buy 5 old manual lenses instead without any difficulty!
I've got over 10 lenses in my collection that cost under £5 each |
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