March 04, 2015, 08:10:34 AM

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Topics - GMCPhotographics

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I'm wondering if the Wondapaner filter system will work with the new Canon ef 11-24mm f4 L lens?
It uses the largest diameter filters currently available. They are like dinner plates, nearly as big as the front element on a 400mm f2.8 LIS (I know because I currently have both). I use my Wondapanner with my TSE 17L and it's possible to achieve max shift in all directions and be vignette free. It's great to be able to use a polariser or a 3 or a 5 stop ND. The ND isn't very neutral but it's useful when an exposure blend is required to get the right shutter speeds. I find on the TSE-17L that I can only use one filter at a time with full shift. But if I stack 2 filters, I loose a few mm of shift. The flare with these filters is pretty bad, far worse than the naked lens element. Which leads me to think that these 145mm filters are not very well coated compared to the native lens...and one has to ask why they are SO expensive as a result.

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Lenses / I feel vindicated by this post about the 120-300 Sigma
« on: July 02, 2014, 05:27:54 AM »
I have to say, I feel more than a little vindicated by this following post about the 120-300 f2.8 OS from Sigma:

http://www.canonrumors.com/2014/06/the-saga-of-the-sigma-120-300-f2-8-os-sport/

I had a copy of the previous (non art) version which is the same lens optically and mechanically. I took it to Ireland to photograph Irish sea birds and I was astonished how lame the AF system was compared to my 70-200 f2.8 LIS II, even with a 1.4x TC. It couldn't track a bird in flight, it would lock and then loose AF. It was hesitant and unreliable. I had high expectations of this lens, but I soon sold it once I returned to the UK in disgust.

The focal drop at MFD was appalling too. At MFD, which one would use to try and diffuse the background of a sitting bird, the focal length dropped alarmingly short. Around 240mm by my estimations, far below the 300mm stated and not much different than my 70-200, which doesn't focus breathe. It's a heavy lens for sure and not really worth the bother for the results I couldn't achieve. Where as the 70-200 f2.8 II L and a 1.4x nailed this shots every time and really showed me how bad the Siggi was behaving. These Siggi lenses really are no match for Canon's finest L's. I currently use a 400mm f2.8 LIS and I look back at this Siggi as a tragic error of judgement on my behalf.

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EOS Bodies - For Stills / T-Stop Web Site listings
« on: March 13, 2013, 09:40:06 AM »
Guys, I'm wondering if we can collate a set of web links which points to sites which show T-Stop listings for Canon lenses?
DP review are now adding T Stop listings for their reviews, starting with the new 24-70 f2.8 II L. But they aren't retrospectively re-working all their other reviews. So I'm wondering if there's any other sources? DXO optics list a single T-Stop value for their lens reviews...but this is only good for primes. Zooms need at least two values, one from each end of the zoom.   

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