1. First, found this video at Mr. Blurrycameraphone's blog and the machine gun performance of the D3s is really amazing!
(Note: As the Chinese YouKu.com blocks direct linking from the Google Blogger, so you can see this embedded video only when you view with a RSS feed reader. If you read direct from my Blog, copy and open this URL in a new tab/window, or still click on, then click once at the link at the URL bar and then hit CR/return, then you should be able to see it: http://player.youku.com/player.php/sid/XMTQwMDU4MDgw/v.swf)
Wow! Full Frame in Nine Frames Per Second! Yes, 9 FPS in FF!!
WHEN will PENTAX have a gun machine like this? (with that high performance and level!) Indeed, the K-7 is nothing even close, the actual frame rate is just about half, even if you are to turn off the AF!
Related Articles:-
K-7 Machine Gun Demo, Timing Measurbations and Size Comparisons
Measurebated: K-7 is NOT a Machine Gun! :-(
2. JenR has made a shootout between the Pentax DFA 100 and Tamron 90 Di Macro lenses:-
http://www.jr-worldwi.de/photo/index.html?macro2_shootout.html
Well, despite that both lenses were set at "1:1" position and mount on the same Pentax DSLR body, the magnification can be seen to be somehow different. The Pentax has larger (possibly more accurate) magnification.
Other than that, you can compare the sharpness and the somehow different contrast/colour rendition (occasionally) of the two lenses. Whilst I like the actual larger magnification and smaller and compact lens size of the Pentax, I do like more the contrast and sharpness of the Tamron. As for colour rendition and taste, both lenses produce "cold" images, which I don't like! :-( (I believe the F or FA 100 Macro are warmer and tasted better! :-o)