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Messages - jthomson

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Lenses / Re: W/A zoom for 5D MkIII
« on: September 07, 2013, 07:11:13 PM »
+1 on the Tokina 16-28mm.  That's what I got for my 5D3

Animal Kingdom / Re: Show your Bird Portraits
« on: September 04, 2013, 06:24:31 PM »
jthomson, great shots, what are you shooting with?  Human gluttony is nothing compared to this guy.  :)


Canon 5D3 and 500mm f4L II

Animal Kingdom / Re: Show your Bird Portraits
« on: September 04, 2013, 12:10:27 PM »
Osprey with Fish

Grean Heron with Big Fish

He Got it Down

Lenses / Re: Recommend websites for lens reviews
« on: September 03, 2013, 02:39:31 PM »

You need to dig in the LensRentals blog, but Roger  provides great information based on multiple copies of the lenses.

Animal Kingdom / Re: Show your Bird Portraits
« on: September 01, 2013, 10:15:46 AM »
Great Blue Heron With Fish

Osprey With Fish

The One Talon Catch

Lenses / Re: Canon 24-105mm f/4 IS : Seller's remorse?
« on: August 23, 2013, 02:13:55 PM »
All serious photographers need the 24-70ii and the 70-200ii in their kit!

All serious photographers with deep wallets that is.... Or are you not a serious photographer without these lenses?  :P

Serious photographers use primes  ;D

Lenses / Re: Best telephoto clarity for the money
« on: August 22, 2013, 05:21:24 PM »
If you can get a high enough shutter speed with the 400/5.6, that's sharper than the 300/4.  Both are very slightly sharper than the 100-400, but there is copy variation to consider, so you may find some 100-400s that best the 400/5.6.  The 70-300L is sharper than all three.

The superteles are on a different class, for IQ and cost. My 600/4L IS II delivers substantially better IQ than my 100-400L, my 70-300L, or the 300/4L IS that I used to own.

+1  My 500mm f4L II has much better IQ than my 400mm f5.6L.   The 400mm f5.6L does play well with the 1.4x III on the 5D3   and with the Kenko DGX 300 1.4x on a Rebel.  The 100-400mm and extenders are much more hit and miss. 

Lenses / Re: Chances of EF-S 17-55/10-22 replacements w/ 7dmk2?
« on: August 22, 2013, 05:10:53 PM »

It WOULD be nice to start seeing better kit lenses.  I've always thought that the 15-85 would have made a great kit lens for the 60D/7D.  Yes, the kits would be more expensive, but as the lens would be higher production numbers, the prices would eventually come down.

15-85mm is sold in a kit with the 7D.  I got my 15-85mm as a white box  from someones kit.

Animal Kingdom / Re: Mystery Bird
« on: August 20, 2013, 02:55:20 PM »
+1 for Green Heron

Animal Kingdom / Re: Show your Bird Portraits
« on: August 20, 2013, 02:53:54 PM »
Ah, since we're on the topic here's one I shot in April I thought was a lesser yellowlegs but I'm being told it's not.  Any idea?

It's a fair sized bird maybe about the size of a Canadian robin.


I'd go with solitary sandpiper as well.

Lenses / Re: Telephoto for 6D?
« on: August 18, 2013, 07:56:13 AM »
You should take a look at the Tamron 300mm USD VC.  It is in your price range.

Animal Kingdom / Re: Show your Bird Portraits
« on: August 18, 2013, 07:50:49 AM »
A couple from the last few days

don't have your specific equipment, but  I've used a kenko 300 dgx 1.4x converter on a 5D3 with  my 400mm f5.6L with no problems.  Before and after the firmware upgrade.

I am a little confused.  The Digital Picture review claims that this new S version shows a significant improvement in sharpness, and has the comparative test results to back this up.  Yet the MTF charts and optical design for this lens and the previous version are  identical.  Also, Roger over at LensRentals (who I have a great deal of faith in) says: "the optics are identical" and consequently he wouldn't pay the extra grand for the new version.

What do you think is going on here?

Explained in article.

 Roger, after tearing down both OS versions of the 120-300, said it appeared that elements in these lenses could be interchanged. The optical design seems unchanged. When questioned about this, Sigma replied that the 120-300 "S" has 2 FLD Glass elements instead of one. FLD glass has performance equal to fluorite, which is excellent.

So 2 FLD elements instead of one so better IQ.

Lenses / Re: Cheap telephoto lens
« on: July 17, 2013, 04:36:29 PM »
Which one to choose? The cheaper Tamron or the Canon with the better optics?

Actually the Tamron  is cheaper and has better  optics than the Canon 70-300mm.
 See the Photozone  review.
Its a no brainer get the Tamron 70-300mm USD VC.

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