In the first article of Zhang Aunt, please enlighten. The experience of buying this lens is actually a coincidence. Before I went to college in 2012, I bought a Nikon D5100, accompanied by 18-105 zoom and 50 f1.8D with celebrity essence (the essence of human optics), took a lot of favorite photos and never upgraded (because it was poor). Most of the product diagrams in this article are carefully shot. During the second only regret is that 18-105 is too bulky, and the human precision and D5100 are not focusing motor, all manual focus is also quite sin. Now people are beginning to be lazy, and they don’t love to go out with SLRs. Instead, they are getting more mobile phones. They are always dissatisfied with their quality and perspective. Some time ago to pack things up at home, pull out the parents bought a Panasonic Lumix GF5 micro single in 2011, wondering to give it a small fixed focus, used to carry. At that time, he took a fancy to Matsushita's own 20mm f1.7 II (known as the 20th God cake second generation), and the second-hand average price was around 1,500. Almost a second-hand seller was negotiated on the Internet. As a result, it was too late to send a courier. During the first two days of shopping, they are ready to go to the store and try to feel it first. As a result, 20 cakes are out of stock, and the boss recommends this piece of Ouba 17mm f1.8 to me. After the trial, I was fond of the workmanship, and the focus was very fast. However, it was about 1000 pieces. After hesitation, the boss couldn't hold it under the rhetoric of "Equivalent 34mm is more practical and also thicker than 1 mm." The buddy who was out of 20 was really unreliable... For me, going to a physical store is actually more impulsive than online shopping. At that time, she searched for Aunt Zhang and found that there was no article devoted to this shot. There was only a single mention of the friend. I hope my article will help future friends who are interested in it. Cards with Jingdong flagship store, other channels will be cheaper. In fact, it was opened in the store, so it was fake out of the box. The packaging is simple, but the main character does not care about the packaging. The metal texture is great for me who just used a plastic lens. It seems that the reason I didn't become a party is that I have no money... The bayonet is also metallic. Origin is Vietnam. It looks like this on the GF5. Because the GF5 itself is small, the lens looks a little bit longer, but it can also be mastered. Using a ruler to measure it roughly, about 7 cm from the front of the lens to the screen of the body, the lens itself is about 3.5 cm long. It's not possible to put it in a trouser pocket. Coat pockets can be packed and a little bulging, but it's OK. This time will begin to tangled 20 cake will not be a little better ... ... no matter what, buy to buy, thin 1 cm is not so good to go! Compare the size. On the left is Nikon 18-105, and on the right is Panasonic's 14-42 head (this GF5 is simply drunk, extremely top-heavy). On the right is Canon's small DC. With the AA5 Power Shot A640, I was in high school in 2009. I was interested in photography because of this portable device. The volume of GF5 is really like. Then compare the phone and D5100 + fine. The entry SLR body plus one of the smallest Nikon lenses is actually very portable, but people are too lazy... Pushing the focus ring backwards will reveal the distance ruler and depth of field scale, while entering manual focus, with the overall appearance, the taste of old lenses. The rotating feel is smooth and the focusing stroke is about ninety degrees. The essence of the most used people in the past belongs to the 50mm head. The 35mm equivalent focal length on the APS-C body is about 75mm. It can count telephoto, and it is good at fresh and small portraits of sugar water. When you go to college, you take a shallow depth of field. The effect of holding people is still very good. However, due to the narrow angle of view, it can only take details or close-ups for a long time. This is also the reason why I aim at the focal length of the equivalent header. Before buying, I am concerned that the equivalent 40mm is slightly wider than the equivalent 40mm viewing angle of 20 cakes. I will not be able to control it. But there is no essential difference when I think about it. After buying it several times, the most obvious feeling is that the focus is too fast. Although this is partly due to the fact that the micro-singing itself is much faster than the entry SLR, the GF5's own sleeve 14-42 is slightly slower than the Oba 17 1.8. Before researching 20 cakes on the Internet, I heard that 20 cakes 1 generation 2 generations have poor focusing speed, but mainly OBA body users have complained badly. Matsushita's body is said to be slightly better, but I don't know how to do it. I think it should be better than 17 1.8 slower. (If you say wrong please correct me) Put a couple of shots (detoxification) on these two days and use Lightroom later. Nanjing’s recently opened Metro Line 4 is nicknamed “A Zi†because of the purple theme color of trains and related designs. Both of these shots were taken at the maximum aperture and I was personally acceptable. Due to the focal length and the size of the sensor, the background blurring ability is naturally weak and is expected. Dried tangerine peel and red beans on the balcony. The closest focusing distance of the lens is 25 cm, you can shoot still life, do not know if you can barely be considered macro ability. Father's word desk. The ink and enamel thing on the edge of the paper was cut out by himself in a paper box. This simple look was slightly sad. Because I do not practice calligraphy, I do not know whether this thing is a regular item or whether it has been sold. The public bicycles operated by the municipal government and public transport groups are still not as convenient as those of ofo, mobike, etc. They must be returned at designated locations. In general, I've been satisfied with the quality of the camera's lens, and the outside of the camera is much softer than the rigid two-linearity used by people in the past. Distortion purple edge of what did not own test, looked dpreview and other sites evaluation, quality is still good, normal use did not find any problems. Coupled with a compact body, quick focus and exquisite workmanship and feel, I think this money is worth more. Contrast with 20 cakes is that the thickness is 1 cm thick, and the sharpness is said to be also weaker than 20 cakes (after all, the god cake), and the price is expensive 1000. However, the focusing of 20 cakes is still awkward. It is recommended that if the budget of Obag body users is not particularly limited, they should still enter 17 1.8. Regarding the issue of blurring ability, the overall M43 system is limited by the size of the sensor, and it is better not to consider the M43 if it requires high depth of field. I am trying my best to get rid of my dependence on the shallow depth of field. Although I am away from the middle telephoto and the shallow depth of field, I feel like I'm using a mobile phone from time to time. As for a slightly broader perspective, this is where I personally need to work. In theory, close to the human eye and large depth of field will peel off the unfamiliar visual effects, people have to focus more on the content itself, explain more of the environment at the same time, a greater amount of information, it is appropriate to use hands-on of. Of course, it is easier to speak on paper than to make progress, and I hope I can make the best use of it.
What is Rogers 4003?
RO4003 material can be removed with a traditional nylon brush. Roger 4003 printed board does not require special treatment before copper electroplating without electricity. The board must be processed using a traditional epoxy/glass process. Usually, it is not necessary to remove the drill hole, because the high TG resin system (280°C + [536°F]) is not prone to discoloration during the drilling process. If the PCB stain is caused by aggressive drilling operations, the resin can be removed using a standard CF4/O2 plasma cycle or a dual alkaline permanganate process. Roger 4003 Printed Board,Wireless Charging Pcba,Wireless Charging Pcb Coil,Rogers 4003 Rf Pcb HAODA ELECTRONIC CO.,LIMITED , https://www.pcbhdi.com
Olympus (OLYMPUS) M.ZUIKO DIGITAL 17mm F1.8 wide-angle fixed lens silver 2799 yuan Jingdong direct link (pseudo) unboxing and body contrast 
The cooking requirements of RO4000 material are equivalent to epoxy/glass. Generally, equipment that does not cook epoxy/glass plates does not need to cook RO4003PCB. For installing epoxy/baked glass as part of the conventional process, we recommend cooking at 300°F, 250°F (121°C-149°C) for 1 to 2 hours. RO4003 does not contain flame retardants. It is understood that a board encapsulated in an infrared (IR) unit or running at a very low transmission speed can reach temperatures in excess of 700°F (371°C). The Roger 4003 printed board can start to burn at these high temperatures. Systems that still use infrared reflow devices or other equipment that can reach these high temperatures should take necessary precautions to ensure that there is no risk.
Life of life:
The high frequency mixing pressure plate can be stored indefinitely at room temperature (55-85°F, 13-30°C) and humidity. At room temperature, dielectric materials are inert under high humidity. However, when exposed to high humidity, metal coatings such as copper can be oxidized. The standard pre-cleaning of the PCB can easily remove the corrosion of the correct storage material.
RO4003 material can be processed using tools and hard metal conditions normally used for epoxy/glass. The copper foil must be removed from the guide channel to prevent smearing.