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  • macro-F1和micro-F1得分分别适用于什么场景? - 知乎
    但每种情况下选用macro-F1、micro-F1,会有一些特例情况产生,下面就针对以上场景,一个个举例给大家看看,到底macro-F1、micro-F1在什么情况下选用会更合适。 第1种情况:各个类别下样本数量不一样多但相差不大 那在这情况下,就是用macro-f1与micro-f1都行。
  • 纳米材料方向,如何排序AM、AFM、ACS Nano、Nano Letters、Small等期刊? - 知乎
    AM,AFM,ACS Nano,Nano Letters,Small,Nano Research如何排序?如还有其他期刊欢迎补充补充:还有Nat…
  • 如何开启EXCEL中的宏工具? - 知乎
    工作中的表格一般不会存在潜在危险,所以大家不用担心。 什么是宏 ? 在Excel当中,宏可以理解为一个复用工具,它可以记录你的操作步骤,并复现你的操作,从而达到自动化的过程。
  • Tamron Adaptall-2 SP (52B 52BB) 90mm F2. 5 - Pentax Forums
    What I rarely see in Macro lens reviews is the mention of the Raynox DCR-250, which makes almost any lens into a macro lens and achieves even higher magnification with macro lenses With the Raynox (without the tube) you can get about 1 5:1 magnification and 2 5:1 with the tube So if you have this lens the Raynox DCR-250 is a very good addition
  • Sigma APO Macro Super goldline 70-300mm F4-5. 6 - Pentax Forums
    Like the APO Macro with the gold ring my copy of the Super only does macro at 300 but it does have Auto Focus Much to my surprise my copy of the APO Macro with magical golden ring doesn't have auto focus, it is manual focus only; says so right on the lens barrel: Sigma Manual Focus Now I probably shouldn't have been surprised since the lens
  • S-M-C Super Macro-Takumar 50mm F4 - Pentax Forums
    This macro lens existed in both Macro-, Super- and Super-Multi-Coated variants The Macro-Takumar was differently constructed compared to the other, later variants and went out to 1x magnification rather than the 0 5x of the later lenses The optics are the same for all three variants Key Variants: Macro-Takumar 50mm f 4 (1964–1966)
  • M42 macro options - PentaxForums. com
    The "macro" close focus abilities of most zoom lenses (there are exceptions like the vivitar 90-180mm which was designed more specifically for close focus) are normally not to be compared with the results from a genuine macro lens
  • Sigma Lenses for Pentax: Zoom Lenses - Pentax Lens . . . - Pentax Forums
    Reviews of lenses by Sigma, Tamron, Tokina, Zeiss, Zenitar, and others designed for Pentax cameras Comprehensive Pentax lens database with specifications and us




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