Jump to content

Emicimoli

Member
  • Content Count

    4
  • Joined

  • Last visited

Community Reputation

0 Neutral

About Emicimoli

  • Rank
    Hermit Crab

Additional Info

  • Show Country Flag:
    Italy
  1. Hello all, thank you very much for your advices! All of you give privided great imput! Here some replies to some of your perplexities: I have worked a lot with imaging and digital photogrammetry from UAVs in the high arctic (snow mapping), so I am well aware of imaging from moving platforms, of plannining, failing, and the trials of it I want to mention that this is not the principal payload ( and objective) of the ROV and light sensors are the main component, thats why I would like to avoid active light sources if possible. The ROV is thethered, thus I think power supply will not be a conncern, can fit plenty of weight there aswell for extra powersupply to the camera. I have supervisors from the AAD ( I am a PhD student), however they have just used video imagery for assessment of the under ice. I would like to obtain relatively high quality pictures. I say video because sometimes i think that it would really make it easier but i prefer pictures. The type of ice we are looking at is usually very thick and not transparent so it is difficult to not to see the difference. Regardng the budget thats something we reserve for later, i would like to have an idea of the relatively best out there in terms of camera and lens. I say that dome port is expensive because the underwater enclosure will be customized. A flat port would greatly simplify the complexity of building such enclosure. Flat port would be great if you think we dont sacrifice too much quality considering that we are going to use a wide angle lens most porbably. Thanks guys!!! Peace and love
  2. Thanks for your reply and interest! We would like to capture the topography of the under ice, which can vary at centimeter and meter scale. Thats why we would like high resolution and possibly still images and as geometrically correct as possible. Hopefully a a mm/cm pixel size. We where also thinking on a wide angle lens, but the tradeoff is the geometric distortion and the need to use a dome port which makes it expensive and difficult to set up in terms of enclosure i guess?` Your guess is right, we use also use light sensors thus thats why active light sources are not best option but still could be considered. Active light sources will influence the measurements and is very difficult to remove their influence of the sensor measurements. 0.5 m is also an option! we prefer to stay distant to the ice to avoid collisions but it can be done! Water is pretty much clear! thats a positive aspect I understand is impossible to have it all, but would be awesome just an opinion on the best camera and lens option available out there! Thanks again and let me know if you have ny more questions! cheers
  3. Hello to everyone, I am writing in order to seek some advice regarding a particular task I am working on. As a side part of my research, I need to take high quality pictures of the sea ice sub surface from a Remotely Operated Vehicle (ROV). The aim is to be able (at least try) to capture the relief of the underside of the ice. It is quite challenging, and I lack some expertise in the underwater photography perspective, any advice from some underwater veteran would be extremely appreciated!! I would need your help mostly for choosing the camera and some clue on the housing and lens port. As you can imagine: the camera is upward looking, the under ice is very low lit, the images arise from transmitted light trough the ice (thus not reflected), imaging the under ice has very high dynamic range; light varies a lot in small spatial scales because of the overlying snow the ROV is moving so we need fast shutter speeds we want to cover as much area possible per frame the ROV with the camera will be approximately 1-2 meters from the target thus the the focal range is quite narrow we would like to have the images as geometrically correct as possible very low temperatures we would hope not to need active light sources, but advice's with/or and without are very much appreciated! HAHA! Well i know it sounds that we want it all and it is kind of impossible but if you have any ideas advice for the idea gear please let me know you opinion. So far, I think that the SONY a 7s is the better option for this task due to its low light capability and is very compact and light (mirror less) and is very fast! However which lens? What do you think? Here some pictures of how its looks like under the ice and what is the target for inspiration: https://www.google.com.au/search?q=under+sea+ice&espv=2&biw=1396&bih=668&source=lnms&tbm=isch&sa=X&ved=0ahUKEwj33vDA4anQAhVDm5QKHZrWCawQ_AUIBigB#imgrc=pEGLldNuugZHvM%3A Thank you all for your attention hope I can get your precious advice!
  4. Hello!! I am Emiliano Cimoli, from Italy but residing in Tasmania. I am a total newbie in underwater photogrpahy but I consider myself a good enthusiast level photographer. I am interested in underwater photography for scintific applications related to my job. Cheers Emiliano
×
×
  • Create New...