WK's Gone Diving

Working distances seem fine on land. I'll test it underwater later in the month.

Thanks. I found the answer somewhere on the web. Formula Diopter focal length x diopter power = 1,000 (1,000mm or 1 meter) Therefore 1,000/diopter focal length = diopter power. And 1,000/diopter power = diopter focal length. As an example, the Inon UCL-165 (165mm), which has a power of +6. 165mm x +6 = 990 (plus rounding error). Another example is the Inon UCL-67 (67mm), which has a power of +15. 67mm x +15 = 1,005 (minus rounding error) When stacking diopters, just add the diopter powers together. Therefore +6 added to +15 = +21. And 1,000 / +21 = 48mm combined focal length. Lastly, calculation of magnification is dependent on camera lens and given by the formula camera lens focal length/diopter focal length. Based on my camera's (equivalent) focal length of 135, we have 135/48 = 2,83x. The image from the stacked UCL-165 and UCL-67 will be magnified 2,83x. The above is based on google power, Corrections anyone?

I am trying to figure out magnification strength of stacking two lenses a) Inon UCL-165, which is +6 diopter. b) Inon UCL-67, which is +15 diopter. How many times magnification does stacking the UCL-67 onto the UCL-165 result in? Thanks

Hi, Inon wet lenses are designed to be mounted directly on the port. When used with a Nauticam Flip Diopter Holder, the lens is further from the port than the lens is designed for. However there is a Inon adapter that allows the lens to be mounted closer to the port when using the Nauticam Flip Diopter Holder. I'm looking to purchase the Inon UCL67 for use with a Nauticam Flip Diopter Holder but my local Inon supplier does not have the Inon adapter. Does anyone know how critical the adapter is? What happens when the Inon UCL67 is mounted on a Nauticam Flip Diopter Holder without the adapter? Thanks

Thanks

Many thanks. I'll have a look at the INON as well.

Many thanks. I was looking for a lower power lens that allows me to approach the subject closer. The A1 has sufficient Megapixels that allows a 1.5x crop and an additional 1.5x clear image zoom and still have sufficient pixels for 4K video. So I'm not really looking for magnification. The CMC-2 looks to be the right lens for me.

On my most recent scuba expedition to Komodo, I did a few macro shots with the camera on autofocus at f/22 and found that the subjects were out of focus. I eventually worked out that I was getting too near the subects as the 28-60 has a minimum focus distance of 30cm at 28mm and 45mm at 60mm. I'm looking for a diopter that will reduce the minimum focus distance to about 15cm at 28mm and would appreciate your thoughts and suggestions.

Yes. I'm using f/22 for macro. Thanks

Many thanks. The photos are indeed useful.

Hi. The condensation issue is not bad. Just put in some desiccant under the camera tray and apply some mask defog to the inside of the port glass. I just happened to screw up with this on the trip. The camera table on the boat was not air conditioned. Yes, I am looking at a wet lens. Will have a think about the UXL-165.

The minimum focusing distance of the 28-60 mm lens is 30cm at 28mm and 45cm at 60mm. Two scenarios: a) focus on a subject at 30cm distance with the lens at 28mm b) focus on the same subject at 45cm but with the lens at 60mm What is the effective magnification of b over a? Thanks

Many thanks for your critique, which is much appreciated. All shots up to the selfie were done with a GoPro 11. All shots after the selfie were done with a Sony A1 using the 28-60mm lens. The A1 is still new and I am struggling with the issue of water condensing on the inside of the port glass as the camera gets hot. I am placing desiccant packets inside the housing and applying mask defog to the inside of the port glass to counter this issue. However, over-enthusiasm in applying mask defog has been detrimental to image quality. There is a blurry shot of a grey reef shark in the video. I believe this accurately low light and bad viz conditions that prevailed when that shot was captured. I included this shot because, ultimately, the video is a reflection of my holiday experience which included diving in low light and bad viz conditions. Doing macro with the A1 using the 28-60mm lens is a new ares of exploration for me, and out of focus macro images has resulted from my carelessness and lack of understanding about the minimum focusing distance of the lens. For example, not being aware that the minimum focusing distance increases when I zoom from 28mm to 60mm has resulted in some out of focus shots when I focus at 28mm then zoom in to 60mm as I compose the shot. Hopefully these focusing errors will reduce as I get more proficient with the camera and alter workflow to compose then focus. With regard to macro, I am thinking of adding a wet close up or macro lens with a minimum working distance of at least 6 inches. Do you have a suggestion?

We lucked out at the 3 or 4 dive sites that mantas can be seen at.

There are no mantas in the video, only mobular. I did not dive Manta Alley but I did do a drift dive at Taka Makassar and did not see any mantas.