SurfnPics
Registered
Fantastic comparison thank Marty. As always you go to quite some lengths to show the various filters, rigs and lighting most of us our interested in knowing real life differences between.
Fishrock Dives SRP filter on GoPro Dive housing
- Thread starter Marty Cerven
- Start date
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Red filters have the effect of warming up light by changing the colour temperature of the light that the camera sees
This is done cutting off the waves at long wavelenght and passing through the short wavelenght ones (if there are any left)
The net effect is to bring the camera into the range of temperatures where the auto WB function can work properly usually in the range of 2900-7000K or thereabouts
It is not possible to determine the max depth of a filter as it depends on the color of light on the day and the water composition
So on a bright sky day with clear water the filter can go deeper say at 25 meters
In the same location with some plankton or sediment on a cloudy day that same filter will stop working at maybe 15 meters as the colour of light may be colder and send the camera auto WB off range
Whilst the average value for the working depth of a filter can be out somewhere around 18 meters there are huge variations due to the conditions some the same filter could do 24 meters in say the caribbeans where the water is really blue and stop at 15 in another place where the water is rich of nutrients and more greenish and dense
Manufactures use different colouring depending on where they test the filters and one could perform well with very blue water but not so well in greenish water
Generally the filters that are very red do well in cyan color water whilst those that are orange are better in water that is a bit more blue
So there isn't a single best filter for all occasions and maximum depth in absolute terms so there is not much point in doing similar tests and assuming that they will work for the conditions you dive into
This is done cutting off the waves at long wavelenght and passing through the short wavelenght ones (if there are any left)
The net effect is to bring the camera into the range of temperatures where the auto WB function can work properly usually in the range of 2900-7000K or thereabouts
It is not possible to determine the max depth of a filter as it depends on the color of light on the day and the water composition
So on a bright sky day with clear water the filter can go deeper say at 25 meters
In the same location with some plankton or sediment on a cloudy day that same filter will stop working at maybe 15 meters as the colour of light may be colder and send the camera auto WB off range
Whilst the average value for the working depth of a filter can be out somewhere around 18 meters there are huge variations due to the conditions some the same filter could do 24 meters in say the caribbeans where the water is really blue and stop at 15 in another place where the water is rich of nutrients and more greenish and dense
Manufactures use different colouring depending on where they test the filters and one could perform well with very blue water but not so well in greenish water
Generally the filters that are very red do well in cyan color water whilst those that are orange are better in water that is a bit more blue
So there isn't a single best filter for all occasions and maximum depth in absolute terms so there is not much point in doing similar tests and assuming that they will work for the conditions you dive into
Last edited:
ChiroManta
Registered
Hi Marty and everybody.
Just finish some diving in Key Largo, Florida.
Did some GoPro HD1 shooting with SRP cyan CY filter
R3 720 setting. NO color correction was done in post production.
Need your opinion guys how can I improve it next time.
The original quality is way better but during conversion by Vimeo quality drops a lot.
Please do not hesitate with your comments.
Thank you.
https://vimeo.com/59010037
https://vimeo.com/59011920
OP
Marty Cerven
Contributor
Nice colours in the videos and looks like some nice dive sites, one thing I noticed is when going to download options in vimeo it says the original is 640x360? For best quality I tend to encode at 1920x1080p30 H264 MP4 with a 2 pass encode at around 15Mb/s video bit rate. Seeing as you have shot yours in r3 720p then maybe encode at 1280x720p30 at around 8Mb/s in h264 MP4 format. If you go to my Vimeo channel and download any of the originals that will show you how I encode my videos. Giving it a high quality encode to work with will give a better end result when it re encodes the video for the video stream.
What software are you using for editing and encoding? does it give you options for how you want to encode? I use adobe premiere pro but most if not all editing packages should give you quite a bit ff control over the final encode.
Edit: the second video seems to be encoded better with the original file showing it as 720p, it may be a limitation of the free accounts on vimeo that only allow one HD upload per week or month, not sure which it is as I have had a premium account there for quite a while.
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