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decosnapper

Rectilinear wide angle lens on FX & behind Subal glass

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...yeah, I know...another "what wide angle works.." thread...

 

So I have a very specific requirement to shoot material with a rectilinear lens. Here's the requirements/fits with list:-

 

  • As wide as practically possible, but NOT fisheye.
  • NOT zoom in any way or form.
  • FX frame - D700
  • Min focus 1m minimum. Closer better but not essential.
  • Subal DP FE4 glass - corner to corner sharpness at F5.6 to F8 to "no visible difference to centre of frame".

 

So what fits that list? Real world used it in anger experience most welcome...

 

 

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I'm not sure that your wish list is actually realistic! Certainly, if you can find an option that meets your all requirements, I think you will have solved the holy grail of FX underwater imaging!

 

With a 4" dome on full frame, you will not get corner to corner sharpness with any current rectilinear wide-angle lens at f5.6 to f8. Of course there may be some that I don't know about, but I have tried most of them.

 

If you go up in size to a 6" dome, things become more viable, although even then only with the token 17mm f3.5 as Alex has mentioned.

 

This is with the Seacam Fisheye Port (6") at f6.3:

 

150410-ahanlon-0606.jpg

 

The corners are OK, but not wonderful....

 

Adam

 

 

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I think Simon has an 8" dome with the Subal DP-FE.

 

I find the 8" is fine with an FE. But not so much with a rectilinear - although I only have experience of the Nikkor 16-35. That needs a 9" dome, the DP230.

 

As Adam says, Simon, you are asking an awful lot...... FX, rectilinear, 8"dome. Ouch.

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My mistake-I thought the DP FE4 was 4" rather than 8".

 

I haven't tested it specifically, but the Tokina should work fine with an 8" dome....

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I have been asked to shoot some Photogammetry sections of vehicles in the Thistlegorm next week, that no longer exist on land - for model builders to make more accurate models.

 

I am going to use the 20mm Nikon behind my optical corrector port. I realise that is not a big help for the original post - but I think it is the best solution - money/availability no limitation.

 

Alex

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So it sounds like I'm asking for the moon on a stick. Here's why:-

 

https://sketchfab.com/models/2f76cf180a8c4dd184515d2fbeeb64bf

 

Looks like a very cool project!

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Cheers all. Second Valentine Tank is processing right now...and the offshore Coronation wreck site comprising cannon & anchors (not all of it...) is under way...

 

Watch this space!

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