Please rate the following two Sigma lenses, thank you!

30 is a DC lens designed for APS-C format, if you have a full-frame plan or film body in the future, then don't 30 is a very good lens, think about it, the aperture of the filter before the light has reached the general ultra-wide angle, 77 of the telephoto head, and several special lenses have been added to the simple structure of the header, the quality is absolutely nothing, and the appearance is also very dragging. Speaking of out of focus, it's purely because their attainments are not high, and the depth of field is relatively shallow, and the depth of field can't be recognized at the level of those people on the Internet, so it's said to be out of focus. I've also tried (though no) lenses from various factories, both long and short, and I've never seen any out-of-focus.

Moreover, whether you can run out of focus or not is also related to the focusing system of the fuselage, which is not simply determined by the lens. I also use the D300, as long as you use **15 cross-focus points, and accurately control the focus point at your desired position, as long as the camera shows focus, there will be absolutely no out-of-focus. As for the defocusing, if you use the remaining one word on both sides of the focus point, the accuracy is much worse; Low-end models such as the D80 also have low focusing accuracy, which is also the reason for the out-of-focus.

Both of these Sigma lenses are worth it, but I personally recommend the 50, which is much better quality than the 30. Than the original lenses? One is that the original factory does not have 30 mm, and it is generally replaced by 35 f2; The original 50 does not use any special lenses, and the quality (under some special conditions, such as backlight, etc.) is necessarily not as good as Sigma.

Your price point is already quite high for prime focus, so don't think about the deputy chief

The original 35 was killed, and novices are not used to it, and manual ...... is often required to operateBut the color doesn't say!

The original 50 is more perfect, and cheap, in the early 2000s, available, very comfortable out of focus! D300+50 is definitely standard!

You can add an original 24 Anyone who has used Nikon knows how powerful this guy is! **Around 2300.

The total is about 4300, which is really worth considering, only 300 more! It really doesn't work.24 like a second-hand one

Nikon lenses are controlled by the fuselage motor, and the lens fit of the original factory is obviously better than that of the counterpart.

While the Sigma 50 is really sharp, I think most people are reluctant to spend more than a thousand more on a side planter......

Sigma's out-of-focus is not as good as the original, and a wide aperture is too much of an out-of-focus!

Sigma's lenses have always been a bit discrete in quality, which LZ should have heard of.

At present, the ** moisture of 514 is large, and it is estimated that the final price will fall in the early 3000s, and some people even say that it will end up in 3000 (I think it is unreliable), so it is not recommended to buy it now.

In addition, 514 pays more attention to corner imaging, so its aperture reaches 77, but it also causes some negative effects because the aperture is too large.

The 314 has a slightly lower rating than the 514, and if you look at it from the perspective of indoor portrait shooting alone, then the 314 is more suitable for small space sheds.

If you consider the big picture......LZ or don't consider these two heads for the time being, the original factory 352, this head still needs to be paid attention to for a while. I'm also paying attention to the 514, using 2 sigma EX heads, and I think the details are poor, but it doesn't affect the overall situation.

The original 35F2 is just the header The original AF50 is not considered??

However, at that time, the three major camera manufacturers Nikon, Canon, and Pentax each had a fairly large series of high-quality lenses for their own cameras, plus the above two well-known professional stocks for the production of lenses. Mr. Michihiro Yamaki, the outstanding founder of Sigma Corporation, an excellent optical technologist, and a corporate management president who is proficient in production and sales (due to his achievements, contributions, and fame in the optical lens manufacturing industry, he later served as the chairman of the Japan Photographic Equipment Association "JPEA"). This alone shows that Sigma plays a pivotal role in the development and development of photographic lenses, and knows how to survive in the face of adversity.

At the beginning of its establishment, the company has taken high-tech as its goal, learned from the strengths of others but not followed in the footsteps of others for its purpose, and won the credibility in the market with value-for-money products.

Sigma (sigma) shares **** is built in 1961 to produce 135 cameras to sell the replacement of lenses of professional manufacturers, which is already a little famous and professional production of lens manufacturers Tenglong, Tokina shares **** 11 years later, when Japan's camera manufacturing industry is in the post-war boom, catch up with West Germany stage, so 135 cameras need a large number of exchange lenses.