Nikon 105 Macro in Dome Port

Can I use a 105 lens for a d80 with the dome port I have for the 18-70 lens? The length of the 105 appears to be able to fit easily inside the dome. Would the diopter needed for the 18-70 lens also be needed for the 105 to be able to focus?

Can I use a 105 lens for a d80 with the dome port I have for the 18-70 lens? The length of the 105 appears to be able to fit easily inside the dome. Would the diopter needed for the 18-70 lens also be needed for the 105 to be able to focus?

It's possible, but not a good idea. You won't get the same magnification.

Jack

Can I use a 105 lens for a d80 with the dome port I have for the 18-70 lens? The length of the 105 appears to be able to fit easily inside the dome. Would the diopter needed for the 18-70 lens also be needed for the 105 to be able to focus?

Yes, it should work ok as long as you stop down well (f/16~22) The diopter is not needed although if you use it you will get slightly closer focus(!). If in doubt, try it, its not going to hurt. I've used a Canon 100 macro behind a dome port and its difficult (although not impossible) to tell.

Yes, you can use it (I've used a 60 behind a dome for a long time, my short budget at the time didn't allow me to have two ports), but as mentioned before, you will lose magnification.

Luiz

When you say it loses magnification, does that mean it performs like a smaller lens?

I tried it but could not get focus underwater.

http://wetpixel.com/forums/index.php?showt...mp;#entry125197

The flat port gives you extra magnification. A dome port restores the original perspective of the lens.

If your lens focuses close enough to focus on the real image created by the dome the lens will work in the dome. Some lenses need a diopter to do this.

I've known photographers to use macros with domes. They do it for better color rendition. And sharpness??

The 105mm macro is capable of 1:1 in air. Behind a dome port you will get less than 1:1 and with a flat port you should get more than 1:1.

With a dome port you actually lose more than the gained magnification you would get from a flat port. This is because of the way the optics work with a dome port and the fact that the lens focuses on an apparent image closer than the subject - and why many lenses require a diopter for correction.

I thought I had some sample shots taken with my 60mm Micro in a dome port, but I've only got ones from my 18-55mm, but that will still demonstrate what happens. In the dome port with the +4 diopter lens I get around the same performance as the lens does in air with no diopter.

Closest focus for 18-55mm at 55mm in air

Closest focus for 18-55mm +4 diopter lens at 55mm in air

Closest focus for 18-55mm +4 diopter lens at 55mm underwater with dome port.

My guess is that you'd need a +4 diopter lens on the 105mm just to maintain the capability for 1:1.