gerald_liu1

<p>A picture is more than a thousand words. Based on the excellent portrait photos in the following link:<br>

<a href="http://forum.mflenses.com/viewtopic.php?t=45469">http://forum.mflenses.com/viewtopic.php?t=45469</a><br>

I ordered the lens ( Pentax SMCP-A SMCP-A 50mm f/1.2 ) from a seller in Japan tonight (January 16, 2013) for US$755 on Ebay (<a href="http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=221177458306" target="new">Pentax SMCP-A SMCP-A 50mm f/1.2 50 mm F/1.2 MF Lens 　Mint！</a><br />Item# 221177458306<br>

The lens is presently not available at Amazon.com. Don't know when it will be available again. <br>

Gerald</p>

 

<p>Hi Scott,<br>

Thank you very much for your explanations.<br>

I believe 'Fly-by-wire focus system' is a kind of electronic proximity system in which the focus elements are opto-coupled by light sensors and receivers to the focus ring, so that the friction between the focus elements and the focus ring is zero, thereby producing a fast response in focusing the image. The focus system is the brain; the focus motor is the muscle. If either one goes, the whole system malfunctions. I could be wrong. (They could also be magnetically coupled. However, opto-coupling was a new technology back in 1970's).<br>

I have decided not to pursue Canon EF 200mm f1.8L lens anymore. Thanks to Photo.net, and with special thanks to you, Scott. You have helped me saved US$3500 today. Cheers,<br>

Gerald</p>

 

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Nikon D300 + Tokina AT-X AF 100-300mm f4, ISO 1200, focus tracking

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<p>Althought today is July 2, 2010, I would like to thank the comments and analysis provided by Mr. Scott Ferris in 2004 on the Subject (Canon EF 200mm f1.8L Comments). I have both a Canon EF 300mm f2.8, and a Canon EF 70-200mm f2.8 IS, and I am just about to consider buying a Canon EF 200mm f1.8L (a used but discontinued lens). Scott Ferris presented a valuable comments and analysis on the applications of the Canon EF 200mm f1.8L lens. I agreed with him. Thanks to Scott Ferris.</p>