Cheesecake said:once in a while? :bsmilie:
nice one there. :bsmilie:
isn't he supposed to have quit CS long ago?
sure sure! :bsmilie:LittleWolf said:I see his posts every now and then, and I would feel very sorry if this community could not accept him just because he wrote some not quite correct things in the past. Despite former mistakes, he no doubt can contribute something.
Frankly, there's much more hilarious nonsense to be read on ClubSnap including from "old birds" and "gurus". I'm sure that if I searched long enough, I would also find something that you wished you never wrote.
Why pick specifically on this one person? Because he appears to have no peer support? That would be very sad indeed.
roygoh said:Really amusing to read the "scientific" explanations given here of how polarizer works and the difference between linear and circular polarizers.
reachme2003 said:you have made it worse, imho. the sheer volume of words absolutely turned me off.
sammy888 said:Hey Roy. thanks for the lengthy but highly informative bit on how a polariser filter works but my attempt was not to get technical, too indepth and overwhelm the newbies or readers. I just wanted to get the basic understanding across in as simple a way as possible and then let the reader's imagination spur them on to try it out for themselve. Some self discovery will help them learn and remember how to effectively use the filter on the long run. I just wanted to also demystified this filter and clear some of the misunderstood claims people here and outside of clubsnap have had with this filter. Yes I agree with your technical explanation but to the lay person...it is too much to take in. At the end of the day they want to be confidence enough to go buy one to try..most likely a cheap one to start with to see what is the big deal about it. The techincal stuff if they ever want to know will only come in handy if they get serious into know more about how the polarising effect takes place.
So now..they know they need to do more then plug and play, they know you need to rotate the outer rim to adjust the effect, they know it has something to do with the fact that it distort or control how various kind of light passes through the lens to the film or CMOS/CCD and that they should get a circular polariser as it is geared more to meet the modern day Auto FOCUS camera and exposure metering system and they also know that the filter is not always the best choice to get deep blue sky..etc. With some of those basic concept, they only need to go out and with some confidence to go buy maybe a reasonable one and go try it out. No theory, technical facts from you and me will give these newbies the best lesson then something they will now go out to try for themselve. Yes there are more stuff I have left out but that is just it...leave it to them to find it out lah. That was how I learn to use and appreciate this filter for example. Too much details just spoil the fun of discovery in my opinion. hehe..
But I did enjoy your info and link...since I am abit of a techno weenie.
LittleWolf said:Sometimes I suspect that the acceptable size limit to the cellphone generation is given by the maximum length of an SMS.
Zerstorer said:Haha, this statement takes the cake!
However, sad to say it is actually most representative of the nature of the forum. Lengthy technical replies most often go unappreciated. This is because those who are technically inclined and with the attention span to follow would usually have grasped the concepts well enough to understand the functions without one having to resort to explanations at the fundamental level.
Those who are unable to understand basic theoretical explanations, will certainly be overwhelmed by the sheer amount of background knowledge that is thrown at them when such a detailed one is attempted.
Sort of a "catch 22" situation here.
From what I observed, a long explanation is more likely to have the enquirer come back later asking you the same thing that you've already stated somewhere in your reply.;p
RoyGoh said:3. Light reflected off textured surfaces are not polarised. Light directly reflected off shining surfaces at particular angle (around 45 degrees) are polarized. In other words, direct reflections off glass and shining surfaces usually consist of polarized light when viewed at around 45 degrees to the surface, which can be effectively reduces by using a polarizer. Removing the direct reflection components of light from a surface brings out the true colour of the material that form the surface. If you shoot perpendicularly through a glass window you cannot remove your own reflection with a polarizer.
4. Sunlight dispersed by the atmosphere is also polarized where the rays are almost tangential to the top surface of the atmosphere. Make the thumb's up sign and point your thumb at the sun. Open and close your fingers while keeping your thumb pointed at the sun. The area of the sky where your fingers sweep across has the most polarized light. That part of the sky can be effectively darkened by a polarizer, resulting in very deep blue skies in pictures
LordAeRo said:Hi guys,
First of all thanks for the long but informative information (especially by Roy and Sammy) on how polarisers work. It helped alot for a newbie like me!
Question: So in a way CIR-POL is differentiated from a linear-POL by the fact that, in simplistic talk, it doesn't mess up the metering. So a CIR-POL is so called "designed" for an AF body? What if a manual focus body uses a CIR-POL? Will there be any difference when it uses a linear polariser instead?
Pardon me if this has been discussed before.
Thanks in advance.
sammy888 said:heheh funny you should mention that. I happen to have both and my Hoya linear one is about 20 yrs old now while my B+W circular polariser is about 10yrs. I have tested it on my antiqued Nikon FG which is the only non AF body I have still and the Circular polariser works fine like my linear version.
http://images.lordaero.multiply.com...Z.Z7my5dG6UkbqLXJiOSbVPo30lfg.YUNHjlgAUVuZQ,Y
Feel free to rebutt if my concepts are wrong, it seemed logical from my point of view.
LordAeRo said:try again, I think it's fixed.
LordAeRo said:Hi guys,
First of all thanks for the long but informative information (especially by Roy and Sammy) on how polarisers work. It helped alot for a newbie like me!
Question: So in a way CIR-POL is differentiated from a linear-POL by the fact that, in simplistic talk, it doesn't mess up the metering. So a CIR-POL is so called "designed" for an AF body? What if a manual focus body uses a CIR-POL? Will there be any difference from using a linear polariser instead?
LordAeRo said:Oh and another question: Roy, with regards to the quoted text above, how does one know when light, before it reaches the polariser, is polarised or not? What constitutes to the difference between a textured and a shining surface for the fact that light becomes polarised after reflecting off a textured surface and not one that shines? Does this mean a textured surface has some kind of property that polarises light?
Pardon me if this has been discussed before.
Thanks in advance.