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diverdoug1

Member Since 29 Jul 2008
Offline Last Active Today, 09:56 AM
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Posts I've Made

In Topic: Second thoughts about vacuum systems

Today, 09:57 AM

Although vacuum systems can detect a significant leak during a dive, I feel that a moisture sensor is a far more sensitive indicator of a leak which has occurred DURING a dive.  The vacuum systems show their greatest utility (IMHO) in 1. Identifying that your system is properly sealed pre-dive, 2.Preloading the O-rings, thereby minimizing blow-by of water at the surface on entry or surface swims.  I use both systems on my housings. 

Doug


In Topic: Decisions, Questions, Decisions......

25 February 2015 - 08:31 AM

With a bit of digging, I may have answered my own question.

 

15mm seems to be preferred over 16mm for the lower price point and closer focusing ability.

I don't think my D800 AF performance is as good with the Sigma 15mm as compared with the Nikon 16mm, but I like the Sigma for WA closeups becaues of the closer focus ability


In Topic: Macro lenses for Nikon D7100

12 January 2015 - 09:45 PM

Jcclink, you do NOT need to press the shutter release in any way to start focusing manually

In Topic: Macro lenses for Nikon D7100

12 January 2015 - 06:10 PM

As far as the VR is concerned, I find it not useful underwater.

In Topic: Questions about Crystal River, Florida

12 January 2015 - 08:35 AM

I think there may be some confusion between the rules stated by the cattle boat with regard to submerging, and Florida law.  Scuba diving is allowed in the areas not in the sanctuary zone, so submerging is obviously allowed.  I find the best photo opportunites are provided if you rent your own boat.  You can rent a pontoon boat for up to 8 people for $25 per hour at the Crystal Lodge Dive Center (352) 795-6798.  Just follow the appplicable laws regarding manatee interaction.  It is a much nicer and relaxiing experience than trying to go on  a cattle boat.