With that new clamp, does it only have 3 points of contact to the plate when tightened down? If so, would you trust this with a long lens clamped in and slung over your shoulder?
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Here is another. I just had a run of six clear nights...something I've never seen before...and got a ton of data on several targets. Most were galaxies, the one nebula was Rosette. This is an 11 hour integration (164x240s subs).
5D III + 600mm f/4 + 1.4x (840mm 1.55"/px) on Atlas mount
Two versions, one "narrow band" like and one "natural color":
This is my longest integration to date, at 11 hours. I did this from my back yard with an IDAS LPS-P2 light pollution filter. That's replacing my Astronomik CLS filter, and it's actually quite amazing. Not entirely dark site quality data, but quite good data nevertheless.
With memory cards supporting UHS Speed Class 3 (= minimum 30MB/s) selling for under U.S.$100, and the smaller form factor, I don't see any reason to keep supporting CF any more.
Considering that my old 7D hit write speeds of >45 MB/s, I don't see a card which would take 50% longer to clear the buffer as a viable option. Also, highest SD card speeds are only achieved after a low-level format, so if you don't perform that time-consuming in-camera task frequently, your speeds get even slower.
Wait, there is a MASSIVE difference in image quality between the 5DII and 5DIII?! Since when??
Yes the 5DIII has improvements across all features (mostly the focusing system), but I don't know if image quality is really one that is massively changed. Used right, the 5DII has fantastic image quality.
The difference is absolutely HUUUUUUGE, it's crazy. I used to shoot weddings (just friends and relatives at first) on a 60D which had great image quality, I made a bit of money so bought a 7D for the bigger view in the eyepiece... unfortunately the image quality wasn't as good so I just used it as a back up to the 60D in the end. I then made enough to buy the 5Diii and a few quality lenses but it messed with my head using the same lenses on both a full frame and a crop so I bought a 5Dii as my back up... I went in blind and just used it as I would the 5Diii (a mistake on my part) and the images were an absolute wreck compared to the 5Diii. I guess it could be just like preferring Kodak film to Fuji though. VC to EC... those old choices we had to make back in the day...
I sold the 5Dii straight away and re-bought the 60D & I never want to look at a 7D again...
The moon (and the Earth under you) are moving remember. You can't take a long exposure unless you have some way to track the moon.Objection! While at night it is dark here on earth, on the visible moon it is day. I have successfully photographed the moon with a 600 L II, a Canon 2x III and a Kenko 1.4 x (in this combination you don't need any extension tube). I used the 6D @ ISO 1600 and f 13 and 1/320 s. At this magnification, you clearly see the moon moving, but believe me, 1/320 securely freezes that movement!
Still hoping I will receive mine before I'll fly from CH to US at 20th of december ....
On the swiss site of Canon I do not see any indication of the expected shipping date
I think this might be a but optimistic. Even if canon finally created a good optical formula for the 400 DO, there is not much to compel someone to buy this lens unless its a "perfect" fit for your kit.
The 300 costs less, only weighs a tiny bit more, plays very well with both the 1.4 and the 2.0, and gives you the ability of f2.8 at 300mm when you need it.
For sports, maybe, but if you're doing wildlife/bird photography, the first thing you do with the 300 2.8 is slap a 1.4x on it which converts it into (more or less) the 400 4.0. So if the 400 is as sharp as the 300, you might as well start from there and have room for more teleconverters at the upper end. It is a shame about the price, though, as it's going to be mighty hard to justify the extra $5000 if the new 100-400 takes teleconverters well.
The 400 DO could be one heck of a sharp lightweight big prime - being Canon's second stab at it.
I mean an ultra sharp 400 and a very good 560 with 1.4X TC - probably far better than the 300/2.8II at 600 with 2xTC.
We shall see in due course.....
It's pretty irresponsible for rumor sites to post this acting like it's a credible source. CR and other sites have actual insider info from credible sources to base their posting on.