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StephenFrink

Member Since 11 Dec 2002
Offline Last Active May 20 2014 10:11 PM
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In Topic: Lens for mid-size animal portraits on 5D3

07 May 2014 - 02:42 PM

Between 8-15 and 100 macro I use 16-35 II a lot. If fish portraits the Sigma 50mm macro with either flat or dome port, depending on probable size of fish targeted.

The 16-35 II is quite useful, and the Sigma 50mm goes to 1:1, which is likewise handy and it is quite sharp. It is the only non-canon lens I use, and only because the Canon 50mm macro does not go to 1:1.

In Topic: Canon lens test - Trying to help a friend

23 January 2014 - 09:10 AM

Ok, so here is the final observation from this test, the optimal port extension for 24-70mm II F-4 L IS and also the +4 diopter, both on Superdome.  Note differences in corner performance and field of view:

 

Attached File  24-70II_PVL45_superdome_16.JPG   401.87KB   46 downloads

24-70_PVL45_superdome

 

Attached File  24-70II_PVL40_superdome_+4_10.JPG   418.19KB   35 downloads

24-70_PVL40_superdome_+4

 

If you need to work wide with this lens try it without a diopter, but still try to get F-8 or smaller for a working aperture to achieve reasonable corner performance.  For reef fish, accepting that you'll be tighter on the subjects, the +4 diopter is quite nice.


In Topic: Canon lens test - Trying to help a friend

23 January 2014 - 08:51 AM

Now the same with diopter, both Superdome and Wideport:

 

Attached File  24-70II_PVL40_superdome_+2.JPG   132.38KB   43 downloads

24-70II_PVL40_superdome_+2

 

 

Attached File  24-70II_PVL40_superdome_+4.JPG   148.46KB   37 downloads

24-70II_PVL40_superdome_+4

 

 

Attached File  24-70II_PVL40_wideport_+2.JPG   133.62KB   48 downloads

24-70II_PVL40_wideport_+2

 

 

Attached File  24-70II_PVL40_wideport_+4.JPG   142KB   48 downloads

24-70II_PVL40_wideport_+4

 

Note significant Field of View loss by using a diopter, and the greater the strength of the diopter the more the wide angle field of view is compromised.  This should be well known by now.  But, if we are strictly looking at corner performance the diopter does help, although at the expense of additional chromatic aberration.  Still, it seems the best corner performance is achieved with a +4 diopter, and the Superdome is still significantly better than the Wideport.

 

If you can stand the loss of field of view, accepting that software can correct for chromatic aberration, the Superdome and a +4 diopter would be a good solution.  But, if you need your 24mm to be 24mm, use the Superdome and PVL45 without a diopter.


In Topic: Canon lens test - Trying to help a friend

23 January 2014 - 08:42 AM

OK, now the 24-70mm II F-4 L IS.  This is a new lens to me so I have no data at all.  But, here's what the tests reveal:

 

Attached File  24-70II_PVL35_superdome.JPG   132.02KB   43 downloads

24-70_PVL35_superdome

 

Attached File  24-70II_PVL40_superdome.JPG   140.93KB   40 downloads

24-70_PVL40_superdome

 

 

Attached File  24-70II_PVL45_superdome.JPG   138.85KB   40 downloads

24-70_PVL45_superdome

 

 

Attached File  24-70II_PVL50_superdome.JPG   134.51KB   41 downloads

:24-70_PVL50_superdome

 

PVL 45 is the best with the Superdome


In Topic: Canon lens test - Trying to help a friend

23 January 2014 - 08:33 AM

Canon 14mm II @ F-4:

Attached File  14II_PVL20_superdome.JPG   131.62KB   49 downloads

14II_PVL20_superdome

 

 

Attached File  14II_PVL20_wideport.JPG   114.24KB   39 downloads

14II_PVL20_wideport

 

 

Attached File  14II_PVL30_superdome.JPG   112.93KB   41 downloads

14II_PVL30_superdome

 

Attached File  14II_PVL30_widport.JPG   100.57KB   41 downloads

14II_PVL30_wideport

 

Attached File  14II_PVL20Left_PVL30Right.JPG   141.86KB   46 downloads

comparison with PVL 20 on the left and PVL 30 on the right

 

All are very, very sharp in the center but do fall off in the corners.  No surprise about that at F4.  However, the PVL20 is better than the PVL30, and the 9" superdome is far better than the smaller wideport.  The only time I'd use the wideport with the 14mm II lens is when snrkeling with big animals and you have to lose water resistance, and are willing to sacrifice corner performance.  In any diving scenario, the 9" superdome is far superior.