Cross-threading 67mm

I need simple instructions for attaching lenses to the front of my Ikelite box for a Nikon p5100.

It seems odd that Ikelite make such a fine thread in nylon when every attachment is metal.

Cross-threading seems inevitable if I haven't already.

Any thoughts on how to avoid it- there isn't a definite click or orientation when turning counter-clockwise and I'm most certainly not going to try this underwater...

I always screw things backwards until I feel them catch then

I screw in normal direction.

I put grease on the threads for less friction and wearing out.

I always screw things backwards until I feel them catch then

I screw in normal direction.

Yes, that is the way to do it with any tread, but especially with treads of plastic or very fine treads.

Screwing backwards gives you a tactile feeling that the tread locked in place and is safe to screw on.

I don't think that grease is a good solution as it may aggravet the problem of cross-treading as the necessary

force for screw in it on - either right orwrong - will be reduced and second the grease may get on the lens with a terrific

impact on the pictures.

Chris

I noticed that problem as well. I have just been as careful as possible, stopping straight away when you notice it is not in the right tracks. I was scared of slicing the nylon threads of the housing off, but after more than one year (of a steady few dives a week) and a loooot of changing lenses everything still works OK luckily.