Cà phê được chứng nhận hữu cơ tái tạo đầu tiên đánh vào thị trường Hoa Kỳ Cà phê được chứng nhận hữu cơ tái tạo đầu tiên đánh vào thị trường Hoa Kỳ Một chương trình chứng nhận môi trường và xã hội của bên thứ ba tập trung vào trang trại được gọi là Chứng nhận hữu cơ tái tạo (ROC) đã chuyển sang ngành công nghiệp cà phê. Một thuật ngữ thường được gán cho Viện Rodale vào những năm 1980, nông nghiệp tái tạo có thể được định nghĩa rộng rãi là các hoạt động nông nghiệp hỗ trợ kết quả môi trường bền vững và thúc đẩy khả năng phục hồi khí hậu, hỗ trợ toàn bộ hệ sinh thái thay vì chỉ đơn giản là cắt sản lượng. Liên minh hữu cơ tái tạo (ROA), một tập đoàn gồm nông dân, doanh nhân, nhà khoa học và phúc lợi động vật và những người ủng hộ lao động công ...
MuhammadNaseer
Thought it didn't work but I was wrong.
I have never owned one of these before so when I got it I looked through both sides, turned it all the way around, and didn't notice any difference. I concluded that I received a defective filter. One poster here suggested to look through it into a mirror. One way it should look clear and the other, dark. It did!. Another person on YouTube suggested the same thing, but instead looking at a computer monitor. Again, clear one way, dark the other. Finally I took it outside and tried it on automobile reflections. Without the filter there was a wide splotch of glare on the hood of the car and with the filter, the splotch was reduced to a tight circle about the size of the sun, so it does work. After all, it was a direct reflection of the sun. As for bluer sky's, I tried that and it made them bluer (I think?). It also made pronounced differences on the grass color which was easier to see. Anyway, I understand that how much difference this makes is determined by the angle of the light so I have some more testing to do. Anyway, at first, I was ready to send this back because I didn't know what to expect or how to test it. This is one case when ignorance is not bliss. I have to assume that a better filter will be better, but for the price difference, this seems to be a good filter with which to get your feet wet and perhaps will be all that many of us need. On the issue of whether the filter degrades the image... I have only taken a few pictures, but I cannot see any degradation what-so-ever. If fact, I see an improvement in shadows making everything seems a little more defined.
CatherineAlshalabi
I like the variable contrast it allows.
I have not had this particular filter before, I usually get one to keep 'stuff' off my camera lens, but after using this one, and turned the filter while viewing through the camera at a cloudy sky, the colors changed, from an almost clear, to a better darker blue, giving me more contrast and removing some bright areas. Not a huge difference, but enough to make a difference that will produce a better picture. I like it. It's the most expensive filter I have ever bought, but since I had a gift card, I didn't worry about it too much. Now I know what it can do, I would buy another. My previous filters on my other camera were just plain polarizing, maybe a 10-15 dollar purchase. I also trust Tiffen, and all my other filters are Tiffen.
JeremyWaugh
... purchased two of the polarizers because they are so wonderful. The way my colors are saturated and how ...
I have purchased two of the polarizers because they are so wonderful. The way my colors are saturated and how I can get rid of unwanted reflections just blows me away. That is more of a review of *all* polarizers though, so what makes the Tiffen good? DURABILITY I have dropped a lens with one of the polarizers attached onto concrete. The polarizer has a tiny scratch now, but my lens was unharmed and is still usable. FEEL The amount of give this polarizer has when adjusting the polarization angle is perfect. It's not so tight your fingers would get tired but stiff enough that you can leave it on for days without the angle changing. CONSTRUCTION This filter feels solid and screws in perfectly. Be careful not to screw it on too tight however, or it will be very hard to remove without a filter wrench. See my unedited attached photos (50mm/1.8) to see how polarization increases saturation.
ElisabetaIoanaCovrig
Great filter, worth the price.
I am an intermediate photographer in college taking photography classes, so I do not have a ton of money on me. I got these Tiffen polarizers, and I am very impressed with the quality of the filters. These were two images I took before and after the filter. I used the same settings on each photo: f/10, 1/80, ISO 400 taken on my Canon EOS Rebel T3i
YawarKhan
My TIffen polarizer was a great filter, keeping out the nasty glare and protecting ...
My TIffen polarizer was a great filter, keeping out the nasty glare and protecting my lens. And then the kid dropped the camera out of the bag....BANG, right on the lens cap. As I pulled the cap off, I could see the filter was smashed, but did it protect the lens?? YES. Very happy customer here. The filter did its job both while filming, and to protect the lens of the camera during a fall. Very happy, and I've already ordered a replacement.
LisaKeyser
Great Filter!
This filter is great quality! Once screwed on, the filter rotates freely on itself for adjustment of polarization. It is pretty durable, too, since I've already dropped it a few times and it survived. The pictures provided start with the filter at the "lowest" setting, then around the middle, and then the maximum polarization. It does a great job with glass and reflections!
CrystalLove
Need a Circular Polarizer? Tiffen gots your back!!
I've used this with my 35mm f/1.4 E-Mount . By far, this polarizer has not came off my lens when i took it out for travelling to Hawaii. It gave my shots more contrast, darkens the highlights to the point where I can use the image and of course, see through reflections. As a polarizer, it does what most polarizers do, I definitely would recommend this filter! Highlights: - Tiffen helps with maintaining the sharpness - Blocks reflections - Ups the contrasts in your shots and reduces highlights
RoxaneGoodfellow
New to DSLR
Received a t3i as a gift and wanted to get some filters to play around with it and this is one I had heard about. A lot of websites on filters are for going pro camera folks, while I wanted some info on just amateur and regular photos, as I'm not a pro, never will be. I'll leave that to the actual experts. I wanted this filter to improve family photos and vacation photos, so I'll leave a small blurb about what I found out the filter does. Anyone, feel free to correct me! I bought the Tiffen as I had read the Tiffen and Cokin filters were the best, and because of other reviews. It is a glass filter that screws in to a 58mm lens end. Others have info on how you can find out if this one will fit yours. I'm sure you can buy it in whatever the right size is for you. The polarized filter is for blocking reflected light from glass and bodies of water (lakes, ponds, streams, puddles). It can also help to darken the sky in pictures, while not affecting other parts of the picture too much. It does not darken the entire scene, just aspects of it by blocking reflected light. You can control how well it does this by rotating the filter, which is good because if you block out too much light a small puddle can look like a piece of glass on the land, and lose the effect.
PaulHopp
Well-priced circular polarizer that gives great results
A well-priced circular polarizer that gives great results on my Sony cameras and Tamron lenses. Well worth the money. Posted a few random snaps here to illustrate the rich blue skies up on my mountain. Camera: Sony a55; lens: Tamron SP 10-24mm 3.5-4.5, ISO 100, 1/60th at f8. There's very slight vignetting at the widest setting, but I also have a very thin UV filter on the lens, so that's part of the problem. (I don't want to take it off unless the shot absolutely calls for it.) Looking forward to taking this on our big Newfoundland and Labrador trip and getting some fantastic shots by the sea.
JetaJeta
Fits Vantrue X1 dash cam
I bought this for a Vantrue X1 dash camera with a 30 mm lens opening that this filter can be screwed into. There is usually considerable glare or reflections in the windshield that gets recorded on the cam's SD card. These reflections deteriorate the picture somewhat. The polarizing filter is constructed in a way where the glass can be turned (rotated) in it's housing until the reflections observed in the cam viewfinder are diminished as much as possible. The advantage of installing a filter on any camera including a dash cam is it also protects the lens from dust and maybe a stray finger print. The filter can be wiped with out worry of possibly damaging the cam lens. Besides diminishing reflections in the video, a polarizing filter will define the clouds better and make the sky more blue rendering better contrast in the picture.