Ikelite dome is sharp even with 20mm lens

Posted by john on June 12, 2002 at 08:04:20:

There has been some ongoing threads about lack of sharpness in corners with 20mm lenses in the ikelite dome due to its small (6 inch) size.

Some folks have stated that the edges will always be out of focus due to bending of the virtual image.

I just returned from Caymans and shot a 20mm lens and got tack sharp images corner to corner. The secret is to manually focus (focus closer than the center of the viewfinder to improve corner sharpness) and use a small aperture (f/8-11) to gain enuf DOF to keep center in focus.

The ikelite system is a bargain.

Follow Ups:

Re: Ikelite dome is sharp even with 20mm lens Rick 04:11:37 06/13/02 (2)
- Re: Ikelite dome is sharp even with 20mm lens john 06:27:32 06/13/02 (1)
  - Re: Ikelite dome is sharp even with 20mm lens Rick 21:55:09 06/20/02 (0)

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: There has been some ongoing threads about lack of sharpness in corners with 20mm lenses in the ikelite dome due to its small (6 inch) size. : Some folks have stated that the edges will always be out of focus due to bending of the virtual image. : I just returned from Caymans and shot a 20mm lens and got tack sharp images corner to corner. The secret is to manually focus (focus closer than the center of the viewfinder to improve corner sharpness) and use a small aperture (f/8-11) to gain enuf DOF to keep center in focus. : The ikelite system is a bargain.

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