nexus housing d70 and zoom lenses

Unfortunately I cannot. I didn't keep all my test images and my dome was damaged on the last trip.

My problem with the combination was significant pincushion that was caused by the diopter (occurred in air without the dome). I also had edge softness but the diopter didn't fix that. I only tested wide open.

Perhaps the 40mm extension works significantly better. I've used 20, 25, and 45mm but typically not with a diopter. Wouldn't mind testing again with the recommended extension. I don't think you should worry at all about using a single element diopter. My only objection to the diopter was the pincushion distortion.

Wide angle lenses do not need achromat diopters.  Single element ones work fine.  The purpose of two elements is to reduce chromatic aberrations---more an issue at longer focal lengths.

I agree that chromatic abberration isn't a problem for wide-angle (which it definitely can be for macro), but I still think there is a problem with the quality of the optics of some single-element diopters. That said, for me this has been at least partly a function of domes and how they work with different lenses. With the 20 mm. fixed focal length w/a lens and the older, smaller Subal dome, there was a huge difference between using a Hoya (and one other) single-element lens vs. the Niklon 5T or 6T.

With the 12-24 and 17-35 zooms used with the larger Subal dome, I've had got very satisfactory results using high quality single-element diopters. (Nikon, of course, doesn't make a multiple-element diopter in the 77 mm size, and I'm don't know if anyone else does either.)

Robert:

A real quality two-element diopter is the Canon 500D. It is made in a 77mm size but it doesn't work with the Nikon 12-24. The two elements makes the diopter twice as thick as a single element and you get vignetting at the corners. Look at the text shot that I took here: http://www.gotosnapshot.com/digital-slr/di...tography-17.htm. I purchased a B & W +4 single element diopter from B & H Photo and the preliminary results look very good.

Herb Segars[/url]

Nexus new port for 12-24 & 18-70mm now availale.

Both include zoom gear, shard and diopter, 18-70 need diopter.

By the way, Nexus D70 can working TTL+BL with SB-800, but you should to chang hot shoe to old model first. :wink:

Nexus makes a 9" dome if you want to spend the money. I didn't like the performance of my 12-24 with any diopter in or out of the housing.

Nexus makes a 9" dome if you want to spend the money. I didn't like the performance of my 12-24 with any diopter in or out of the housing.

Nexus new port for 12-24 no need diopter.