在网上看到一段评论，关闭SR可以提高自动对焦精度。不知道各位大虾有什么高见。

大概意思是这样的：K-1在高ISO性能方面表现优异,但是在低光条件下,就像其他宾得单反相机一样，SR防抖功能更容易影响自动对焦性能，特别是相对其带来的防抖帮助。如果可以的话,请确定你的景深,并使用合适的光圈以便快速释放快门，同时不必依赖自动对焦反复进行确认。我使用过的所有宾得相机,或者借用过的相机,我的体会是防抖功能对自动对焦来说都是个烦恼。它只适用于远距离静止场景拍摄，并且有很大的可用景深范围。然后你可以利用防抖功能降低ISO值,这在风景摄影中是可取的。
但是当K-1可以达到25600ISO时,请忽略防抖功能,相机整体性能会更好,自动对焦也会工作得更好。

原文是这样的：The K-1 has excellent Hi ISO performance but in low light, like in other Pentax DSLRs, SR will cause more damage to the AF than the benefit. If you can, ascertain your DoF, and use apertures that allow quick framing and release without relying on AF to catch up and confirm again and again.
My experience with all Pentax cameras I had, or borrowed, is that SR is a nuisance for AF work. It only works well when shooting static scenes at a distance, with enormous available DoF. Then you use it to lower the ISO down, which is desirable in landscape photography.
But when the K-1 allows very good ISO 25,600, forget the SR and the Pentax camera is then generally much better and AF works better too.

作者进一步解释到：自动对焦和防抖是关联的，因为防抖功能会持续影响记录CMOS传感器。自动对焦告诉我们应该对焦在什么位置,在拍摄图像时的确切视场。说它们不相关,这是一个不科学的说法。我花了很长时间来解释原因。在其他时候和地方,人们可能会详细阅读,但是习惯于访问两个论坛(完全无能力、不宽容和倒退的PentaxForums.com影响他们的判断力)的当地人直接把它扔掉。但是我发现这里的人通常更乐意帮助和探索。
→请再次审视一下增加更多材料的说明,其中还涉及其他厂商的解决方案。
这个问题非常严重,它会影响景深计算。因此需要无限次调整景深,镜头的嗡嗡声等,这会影响浅景深下的自动对焦功能。如果快门按得快,用户得到模糊照片的可能性更高,这就是问题的严重性!
这不是我的想象 - 在新的主题中也有抱怨 - 他无法像使用尼康一样使用K1。还有一个不同的问题是K1在光线较差时连基本的自动对焦性能都欠佳。
仅仅在这个论坛上就有数以千计的主题包含相同的投诉,一次又一次地出现。我试图一步步解释为什么会发生这种情况,解决每个问题,以及宾得采取的解决方案 - 因为宾得工程师很清楚这个问题 - 会导致(1)可预见的功耗后果,(2)对焦速度和(3)镜头性能。
要最终解决自动对焦问题,宾得必须以某种方式摒弃反光镜。最后一点:理光研发和注册的可变透明镜专利 - 告诉我的理论是正确的!
他们正在开拓新领域来解决自动对焦问题。额外好处是EVF叠加,以提高从透明镜传来的暗淡图像,最后允许用户看到移动传感器看到的内容。
使用PLM镜头,这样的相机才能在没有损失的情况下使用。

AF and SR are dependant, because the SR contnuiously affects the imaging sensor which records the image. The AF tells what to focus on exactly, in the exact FoV when taking the image. That they are unrelated, is a very unscientific remark.
I embarked on a rather long description to explain why. In some other time and place people would read in detail, but locals accustomed to visit two forums (totally incompetent, intolerant and backwards PentaxForums.com influencing their better judgment) just trash it away. But I have learned people here are generally better eager to help and explore.
→ Please take a look once again, at a writeup with more material added in, which addresses solutions from other manufacturers too.
The problem is so serious it affects the DoF calculation. Therefore endless DoF adjustments are needed, whizzing of lenses, etc. and that kills the AF with thin DoF at hand. If working fast, it is more likely users will get out of focus shot than a focused shot, and that is how serious problem is!
And that is not my imagination — the OP complained in a new thread too — he cannot use the K1 in the way he used Nikon. There is a different problem too, and that is that K1 lacks even in regular AF performance in bad light.
There are thousands of threads around this forum alone with same complaints, coming over, and over again. And I have tried to explain, step by step, why that happens, addressed each issue, and how solutions that Pentax implements — because Pentax engineers are well aware of this — results in (A) predictable power consuming repercussions, (B) focusing speed and (3) lens performance.
And to finally solve AF problems, Pentax must ditch the mirror in some way. As the last note: the very patent Ricoh has developed and registered, of using a variably translucent mirror in a future camera design — tells that my theories are correct!
And that they are breaking new grounds to fix the AF issue. The additonal benefit being the EVF overlay, to boost over the dimmed image coming from the translucent mirror, finally allowing users to see what the shifting sensor sees.
With PLM lenses, such a camera can finally be used without penalties.

另外也有人提到了中心9点对焦也可以提高对焦精度。

讨论来源：dpreview.com/forums/thread/4199813

试试就知道

我不懂 这k1又不是无反 他的对焦模块是单独的 你就算把cmos拆了它也能对焦

我认为，防抖可能是影响对焦精度的一个因素，但这个因素和对焦是两者相权取其轻。防抖可以让你在低速快门1/15能拍出清晰的照片，在举着沉重的远射镜头在低于1/200时也能拍出清晰的照片。而放弃防抖在这种快门下手的抖动将更影响照片的清晰度。
而解决宾得对焦精度最好的办法不是从防抖这方面入手，而应该从镜头马达和快门时滞上来解决才是王道。k33就是最好的例子。
可惜宾得去做胶片机了……谈这个也没意义了……胶片机嘛对焦跟着感觉走吧
我是键盘党 编辑于 2023-08-30 22:23