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<table cellpadding="3" cellspacing="0" width="100%" class="forumline"> <thead> <caption><table border="0" cellspacing="0" cellpadding="0" width="100%" class="forumheader"> <tr> <td align="left" valign="bottom" width="25"><img src="http://picsrv.fora.pl/AcidTechTiger/images/hdr_left.gif" width="25" height="27" alt="" /></td> <td align="center" class="forumheader-mid">Topic review</td> <td align="right" valign="bottom" width="25"><img src="http://picsrv.fora.pl/AcidTechTiger/images/hdr_right.gif" width="25" height="27" alt="" /></td> </tr></table></caption> </thead> <tbody> <tr> <th class="thCornerL" width="22%" height="26">Author</th> <th class="thCornerR">Message</th> </tr> <tr> <td width="22%" align="left" valign="top" class="row1"><span class="name"><a name=""></a><b>Googlelovqj</b></span></td> <td class="row1" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="http://picsrv.fora.pl/AcidTechTiger/images/post_old.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Posted: Tue 18:13, 24 May 2011<span class="gen"> </span> Post subject: christian louboutin shoes On the accuracy of manua</span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody">,<a href="http://www.edhardymexicos.com" target="_blank">ed hardy mexico</a> <br />On the accuracy of manual focus SLR camera <br /> <br /> <br />Precision manual focus camera,<a href="http://www.ralphlauren-uk.net" target="_blank">polo ralph lauren</a>, the split-image prism, a (fifth paragraphs): light through the lens of one image is formed at both ends of the hole. In a sense, it is equivalent to a split-image rangefinder prism. The baseline diameter of the lens light holes. If 50mmF14 lens, the baseline 35ram wide. How to determine split-image prism wedge angle n (Fig. I). Kids in a n angle large. Only large aperture, high accuracy, the narrow scope of application of weeks n are small. Also applies to smaller diameter, low precision (ie, a short baseline length), and wide application. So far, the world Sheng SLR camera grip angle only up to a large IO. . Minimum of about 6. , Now widely used is 85. . The optical formula 8; (n A 1) n shows (see Figure II): 10. . Light deflection angle a of a 5 ', n = 8', the light deflection angle 8 ≈ 4. . = 6. . Light deflection angle a ≈ 3 according to the formula t: / 2f so. Split-image imaging in diameter is the nominal L: Figure II F = f / 8 = 3. . F = F9.5a = 4 ',<a href="http://www.christianlouboutinshoesr.com" target="_blank">christian louboutin shoes</a>, Fh = F78 = 5. , F = F5.7 even if the wedge angle of the split-image focusing too. Use the equivalent of only two beams F5.6, you can use F2 or FI. 4 split-image prism of light, but never adopted by any manufacturer thrown off! So above the following defects. to Mr. Kong, such as by the greater understanding of the lens aperture, the higher the use of split-image focusing precision (because of the longer time baseline.) In fact, the split-image wedge of wedge angle of light Once,<a href="http://www.maccosmeticsdiscountsale.com" target="_blank">mac cosmetics discount</a>, the focusing accuracy has nothing to do with the lens aperture. Only with the lens focal length. As long as the lens aperture is greater than the critical value of crack like black, then the lens focal length. The longer the baseline. (2) according to the original meaning, many will mistakenly believe that large aperture Photographic lenses can improve the focusing accuracy. Fact that the focus SLR camera lens and the accuracy of the standard wide-angle lens, the lower level as the viewfinder of the split-image or double image re-sets the precision of focusing only when the nose is longer than 100ram from the play only after the advantages of more accurate focusing. (3) micro-prism focusing using the same principle,<a href="http://www.fredperry-outlet.com" target="_blank">fred perry outlet</a>, and well designed home in the viewfinder focusing screen, in order to expand the use of too much focusing screen and 2, J. Adaptability. General election to use too much of the split-image prism wedge angle, he could choose a smaller emblem rejection solid angle of this edge. As long as the lens aperture can make a big threshold for micro-edges black, micro-prism focusing precision with the pore size is irrelevant. {4) On the magnification viewfinder: SLR camera's viewfinder magnification is 50ram in the name of the header label and calculate the actual images seen in viewfinder eyepiece magnification and the focal length is not only relevant, but also with the lens focal length Xin. The size of canned f / f eyepiece, so the text said: Uncle described above only the header (or, more precisely: only 60 ~ 55mtTl focal length lens) was established. SLR cap machine with an effective baseline length of ≈ focusing lens viewfinder magnification x baseline length, due to both the lens focal length is proportional to the single-box camera has a solid Min Ji Yue focal length and proportional to the square mirror, calculations show that SLR cameras have a variety of education as follows form the baseline length. . . . . '. . . . '''. . . '. . . 1. . . '. ~ ~ J the effective baseline length of the lens focal length (fixfil1) Il20mm ultra wide-angle l ≈ 124ram ultra wide-angle wide-angle ≈ 1.1 ~ 1.2lI35mm j ≈ 2.5 ~ 4150mm header f ≈ 5 ~ 8Jl1O0mm in the coke head ≈ 2o the focus of a 301I135mn】 head I ≈ 35 ~ 55I200m112 telephoto telephoto first ≈ 80 ~ 120lI400mm head l ≈ 320 ~ 480L ----. . . . . . . . . . . 1. . . ---- A result of a SLR camera under the ultra-wide angle 24ram, the rejection of focusing screen focusing accuracy than the accuracy of visual focus. Paragraphs 3, fold. 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