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Reducing/removing the rolling shutter prop effect (neutral density filters etc)

FiLMiCPro for iOS offers full manual control. See: https://itunes.apple.com/us/app/filmic-pro/id436577167?mt=8

EDLE, Netherlands

Can you post a video through the prop?

All current top end phones have similar sensors. This is the S7 app

There is shutter speed. But it does not work in the true sense which you get on a 1000 quid camcorder. I don’t know why but the answer is probably out there.

Administrator
Shoreham EGKA, United Kingdom

I don’t have a sample video taken through the propellor (photo’s I posted above in a previous post). However, the app beats $5000 camcorder blind comparison tests and supports rolling shutter features. The app is available for Android as well, so why not try it out? See: http://www.filmicpro.com/

EDLE, Netherlands

I bought the Filmic Pro android app and flight tested it today


It was turbulent but you can see the propeller is removed fairly satisfactorily.

Manual mode, shutter set to 1/100 approx and ISO set to the minimum possible.

This is a better result than I have managed to get with the stock app, but not as good as a proper camcorder in manual mode and a 1/120 shutter (as posted previously).

However, even at the lowest ISO setting, the phone needed an ND filter to prevent over-exposure (I used sunglasses because I didn’t have anything proper) and there is no easy way to attach one of those to a phone. Also I cannot be sure that the same ND filter with the stock app would not achieve the same result; I need to test that. The actual camera is the same and so is the API. All smartphone still and video camera apps are in reality little more than a “control panel” onto the API.

On the minus side, the Filmic app is the most counter-intuitive app I have ever used. They have thrown in every ultra hyper modern fashionable user interface paradigm and as a result it is hard to work out what the hell it is doing and whether any setting you have selected gets saved (the manual settings don’t seem to get saved and there is no option for that).

Also it saves the video files into locations which are quite bizzare and I was able to discover them only with Root Explorer. When Internal is selected (there is no path setting in the app) the files end up in a DCIM location no other app uses, but I found it OK, after a few mins. When External is selected (logical if you have a 200GB SD card in an S7!) the files end up in a path which only android hackers will know about because it is the one path which android v6+ allows apps to access by default if the programmer is lazy; it is a path in the app’s private data folder under [SD-card-volume-label]\android\data\com.filmic.filmicpro\files\DCIM\FilmicPro\. It thus appears that the intention was to make users utilise the album feature provided within the app, which has the usual Share etc features. However I have other apps which have no trouble accessing the SD card OK e.g. QuickPic.

I will do more tests on the next flight, with an ND filter stuck on it. But I don’t think this is very practical for most people.

Administrator
Shoreham EGKA, United Kingdom

Cool! Good start. The ND filter is indeed needed and I honestly haven’t found a simple solution yet to mount it other than the Beastgrip as can be seen here: http://www.filmicpro.com/support/gear-cases/

Then, there is image stabilization, which I like in the new GoPro Hero 5 or Osmo cameras.

EDLE, Netherlands

Gosh… with bulky phone attachments like that one could as well use a decent pocket-sized camera, of which some of the ~€400 ones are quite good. But a phone gives you the connectivity options etc.

Administrator
Shoreham EGKA, United Kingdom

Just haven’t found that ideal ND filter to put in front of iPhone lens or Moment lens. See: https://momentlens.co/

EDLE, Netherlands

I intend to buy this ND filter for iPhone to remove the propeller effect in videos:
http://dckina.com/index.php?main_page=product_info&cPath=4_332_334&products_id=1999

LGMG Megara, Greece

Yes, that works very well. There are also some apps that let you control shutter speed on the iPhone, but the filter is the easiest way. In the Cirrus I simply shoot through the high quality Rosen sunvisor … that takes care of the prop, and later i only have to correct the colour, because the sun visor is green.

This one was done with my old iPhone 6 through an ND filter.

Last Edited by at 10 Oct 14:24

I have never seen a phone / action cam + ND filter combination that “removes” the prop, and still leaves you with a usable image of any moving scene.

Administrator
Shoreham EGKA, United Kingdom
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