htomas
TPF Noob!
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- Jul 22, 2009
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Dear photographers,
I consider myself as a rather newbie in the dslr photography, so I am sorry in advance for some meaningless questions coming from my side.
I would like to buy the fastest possible (in terms of light transmission) 82mm Hoya circular polarizer for my f2.8 sigma lens, such that I could keep this filter fixed during the most (if not all) shooting situations. But after some research I left quite perplexed with several things - and I hope that you guys might explain them to me.
1a) on the hoya website
HOYA FILTERS - The Difference is Clear
an 82mm S-HMC circular polarizing filter is advertized. As I understood from the hoya website, a SHMC means a 99.7% average light transmission, which would be a perfect (fastest) circ. pol. filter for me. But I have never (ever) found this filter on any of the internet shops (unlike SHMC UVs, which are plentiful).
1b) So I wrote to one of the hoya resellers to ask for this filter and they told me that the fastest available Hoya circ. polarizer is HD (heavy-duty), which, according to them, transmits 99,35% of light.
My first question is then - what is actually available on the market from the higher-end of hoya circ. pol. filters? And which of them is the fastest in terms of the average light transmission?
And my second question is really a newbie one (in case the previous one wasn't):
2) When I read a 99.35% of the light transmittance, I understand that almost all light - and certainly more than half of it - will go through the filter into the lens and camera sensor. I was then surprised, when I read on this website
Hoya HD Polarizers
[FONT=Helvetica, Arial, sans-serif]
that a HD polarizer stops more than a half of the coming light:
> Light loss (filter factor), HD Polarizer: 1-1/6 stops (2.2x).
Could you please explain me what do I understand wrong? How can a 99.35% light transmission end to a more than a 1-stop loss?
Thank you all for any comments, hints, or links, I am in a process of learning and be happy for every explanation!
Regards,
Tomas
[/FONT]
I consider myself as a rather newbie in the dslr photography, so I am sorry in advance for some meaningless questions coming from my side.
I would like to buy the fastest possible (in terms of light transmission) 82mm Hoya circular polarizer for my f2.8 sigma lens, such that I could keep this filter fixed during the most (if not all) shooting situations. But after some research I left quite perplexed with several things - and I hope that you guys might explain them to me.
1a) on the hoya website
HOYA FILTERS - The Difference is Clear
an 82mm S-HMC circular polarizing filter is advertized. As I understood from the hoya website, a SHMC means a 99.7% average light transmission, which would be a perfect (fastest) circ. pol. filter for me. But I have never (ever) found this filter on any of the internet shops (unlike SHMC UVs, which are plentiful).
1b) So I wrote to one of the hoya resellers to ask for this filter and they told me that the fastest available Hoya circ. polarizer is HD (heavy-duty), which, according to them, transmits 99,35% of light.
My first question is then - what is actually available on the market from the higher-end of hoya circ. pol. filters? And which of them is the fastest in terms of the average light transmission?
And my second question is really a newbie one (in case the previous one wasn't):
2) When I read a 99.35% of the light transmittance, I understand that almost all light - and certainly more than half of it - will go through the filter into the lens and camera sensor. I was then surprised, when I read on this website
Hoya HD Polarizers
[FONT=Helvetica, Arial, sans-serif]
that a HD polarizer stops more than a half of the coming light:
> Light loss (filter factor), HD Polarizer: 1-1/6 stops (2.2x).
Could you please explain me what do I understand wrong? How can a 99.35% light transmission end to a more than a 1-stop loss?
Thank you all for any comments, hints, or links, I am in a process of learning and be happy for every explanation!
Regards,
Tomas
[/FONT]
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