This is a review on a SD Tamron 2/3" B4 lens with a 9-126mm focal range mounted on a Panasonic GH2. The zoom capability of these lenses is incredible and money for money can not be beat. This lens starts at a F/1.6 and for a standard telephoto DSLR zoom lens something like that would cost in the thousands. This lens you can easily pickup in the price range of $50-$250. On average a B4 to MFT adaptor will cost in the $100-$300 range. For long range filming or when you need something with a great loos at and something that grabs light you can't beat these lenses. You can take closeup shots with them but the best usage for them is when you need zooms. With a power source attached to the lens the zooms are super smooth when using the rocker switch. There wis a great group on Facebook that is full of knowledge on these lenses. If you are at all interested in them I highly suggest joining this group. I normally shoot the review videos with the GH2 that you see in this video. The problem is I can shoot a review about a camera with the same camera. I had to use two different camera that normally wouldn't and technically shouldn't be paired and that is why the wide shots are nice clear and crisp and the close up shots have a weird color palette and look kinda off. For recording sound I used a Pyle Pro wireless lav mic. The mic itself works great and is clear but when you attach it to the wireless setup it gets distorted as you can hear. I had the wireless mic setup going directly into a Tascam recorder. Next video I will use the lav mic by itself going directly in to the Tascam recorder and completely forget using the wireless portion. Live and learn I guess. Equipment used to make the video: Camera: GoPro Hero3 Black Edition - wide shots Camera: Canon Powershot ELPH 300 HS - close up shots Microphone: Pyle Pro wireless lav mic Audio recorder: Tascam DR-05 Equipment shown in video: Camera: Panasonic GH2 Lens: 2/3" B4 Tamron 9-126mm f/1.6-22 Tripod: Fancier FT-717 As quoted from the files section of the B4 to MFT Facebook group "The introduction of the B4 interface was a milestone - it was the first time in history that a common lens mount and specifications were adopted for all 2/3" HD cameras. (this was the Broadcast Technology Association global standard BTA S-1005-A adopted in 1994, followed by the EBU Tech Spec in 2002). Before this standard, every camera manufacturer had their own mounts and specifications. I could not use a Panasonic lens on a Sony, or an Ikegami. Sometimes you ordered a new camera based not on its features, but on the glass you owned. In establishing the B4 standard, a specific 48mm flange back dimension was dictated - this is where the green image "in air" plane is that you see reference marked on the side of the camera - and what you "back focused" to. If you are only looking at one part of the light spectrum, that would be easy - and the end of the story. Chances are that you are not shooting black & white - where the green channel would be enough for luminance. Color adds a degree of complexity. There is a brilliant engineer I know from Sennheiser who likes to say that "Everything in life is a wave" (Thank you Volker!!!). He is right - when you are talking about capturing images, those beams of light travel through the lens at different wavelengths - therefore they focus at different planes. This is what is called "longitudinal chromatic aberration". There is a secondary issue - when they focus at different distances, their size (magnification) is different - this is referred to as lateral chromatic aberration. In the case of 2/3" HD cameras, the light is split by a prism to land on 3 sensors. The prism assemblies are designed to mitigate both types of aberrations by offsetting the sensors - Red is offset by 10 micrometers and Blue is offset by 4 micrometers from the Green image plane. This is a compromise - but take away those modifications and you end up with real problems ( aka inferior results). The B4 lenses are designed - as a worldwide standard - to pass the light waves into a camera with the above factored in. That means that without optical correction, any B4 adapter would pass a flawed image onto a single sensor. There is no work around once you capture it wrong." Anthony Burokas: The workaround is uses a chip where the photosites have enough spacing that the 10 micrometer difference is not discernible. The M43 chip, the full chip, with pixel binning, may approach that, maybe not achieve, but certainly mitigate it. This is why a B4 lens can be used wide open with the doubler engaged (FF M43), and not in ETC mode (doubler disengaged)." Please visit our Amazon Associates Store Front: http://astore.amazon.com/homtheplu-20 ******* Please Subscribe, Follow and LIKE at: ********* Facebook: https://www.facebook.com/PaulKepnerProductions Twitter: https://twitter.com/productionspk Instagram: http://instagram.com/paulkepnerproductions

• published: 08 May 2014
• views: 13743