There are many people using soratama underwater by fixing it into housing. Currently we do not offer support to this. However please refer to the following page. http://dc.watch.impress.co.jp/docs/review/omoshiro/20140909_665266.html Also, there is a Facebook group for soratama and information are being exchanged. https://www.facebook.com/groups/832273703465153/
If this is your first time to purchase “soratama 72” please buy the “Extension Tube 72” as well. The extension tube enables you adjust the length by 5mm until it hits 55mm. These products are basically a set. The reason why “soratama 72” has a 20mm extension tube on is to protect from breaking when transporting.
Please see “Photographing with Soratama” for information. Here are tips to focus on the target using soratama. (1) Set to manual focus. (it does not mean manual exposure) (2) Try to focus on the nearest object. (3) After taking the step (2) above, try to move the soratama lens back and forth until it is focused. If you fix the extension tube 72, try to see if it can be focused with the auto focus mode.
If you were using telephoto lens, the focal distance will get long. Please try using wide angle or standard lens. Also, the wide angle side of the zoom lens can also do.
There are cases that inside of the camera tube gets reflected on the picture and the corners get dark. In those cases, please shorten the camera tube until the corners do not get dark or extend the focal distance. If you cannot bring it into focus after shortning the camera tube, please try to extend the close-up ring. If you cannot take the steps above, please trim the image with an editing software.
If the soratama ball gets reflected too big, please try to extend the extension tube or shorten the focal length. (If you are using zoom lens, try to zoom in widest angle side.) When you cannot bring into focus after extending the extension tube, please try to shorten the close-up lens.
You can use the close-up lens. However, the extension tube might get too long if you use the extension tube. The extension tube is made of metal and it is pretty heavy. For this, if it gets too long, there is a possibility of damaging the lens. If you are using the handmade soratama with paper made camera tube, it is okay to use the close-up lens.