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Showing all 2 reviews by pipo3840

Review of: Tamron Di LD Macro 70-200mm F2.8 by pipo3840 on Sat September 19, 2020 | Rating: 10 View more reviews 
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Views: 330040
Reviews: 87
A crisp clear lens with really excellent optical quality. However the autofocus is a bit lost with this lens, and the screw drive is sloooooow. Excellent results in astrophotography https://www.pentaxforums.com/gallery/images/125121/large/1_Stack_436frames_6976s.jpg

Review of: Carl Zeiss Jena Sonnar 300mm F4 by pipo3840 on Sat September 12, 2020 | Rating: 0 View more reviews 
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Views: 35337
Reviews: 4
Hi Folks, Just a precision about the versions. The "Zebra" optical version has nothig to compare with the MC version. The MC version is closer to the Meyer-Optik Orestegonn 300mm than the original zebra design. This was done essentially for cost reasons because the original zebra was very difficult and expensive to manufacture. As a consequence the chromatic performance of the later MC versions is much lower thant the older ones (zebra type). You can find some comparisons here : https://zeissikonveb.de/start/objektive/objektivtests.html The chromatism is reduced on MC types when it is stopped down.https://zeissikonveb.de/____impro/1/onewebmedia/Marco/Basteleien%20und%20Reparaturen/Linsenlagen.jpg



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