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Member Since 05 Sep 2006
Offline Last Active Today, 08:41 AM

Posts I've Made

In Topic: Nauticam Super Macro Converter

12 March 2015 - 07:13 AM

Wauwwww. this is great stuff Simon!

As far as I see, the images are not really comparable, because the're shot with completely different apertures (F16 vs.F36)

In my experience there's a huge difference in diffraction.

Was it done for a certain reason?

In Topic: Full Frame SLR wide angle corrector port tests

25 January 2015 - 10:49 AM



Hi Wahrmut, 


I don't yet have a proper mount for the internal lens of the corrector port. So I have to stick it to my camera lens with blue-tac. When I do this carelessly (for the pool tests) I get some vignetting in the extreme corners. I have commissioned two replacement lenses which are bigger and won't have this problem. The simple solution was ready for this trip, but does not work that well. So I am still using the original lens, which is a bit small and therefore vignettes if I fit it carelessly.


Thanks for the plausible explanation, Alex!





In Topic: Full Frame SLR wide angle corrector port tests

22 January 2015 - 12:03 PM

Very interesting thread - I'll keep following...

I also had the chance for a more rigorous pool test between dome and corrector port, this evening. I tested if there was any lost in angle of coverage compared with dome - as there was not.






Corrector Port:




Also corrector consistently seems between 2 and 3 stops better in terms of corner sharpness. I.E. f/4 on corrector port had comparable corner sharpness to f/8 or f/11 on my best dome. 



What happend to the very corners?

They seem to have a much stronger vignetting.



In Topic: Goby question

22 April 2014 - 09:22 AM

Sorry to you both that I didn't reply to your comments - of some reason the function for following the topic was switched off...  :-(


I must admit that I really struggle in differentiating the species of Gobies, e.g. P. micheli and P. mossambica.


Is it absolutely impossible that P. mossambica lives on a hard coral?

If so, is P. micheli the only alternative?


Thanks so far!






In Topic: sea snake question

22 March 2014 - 12:22 PM

Thanks for the quote, pointy!

It's always good to get a reliable ID from an expert.

And thanks to everybody, helping to answer my question.