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-   -   Rolling shutter explained (https://vansairforce.net/community/showthread.php?t=131527)

bulldogbuilder 02-27-2017 11:57 AM

Another totally worthless blurb. Most of us get the drift of the prop blur with and without the filter in 10 seconds. 2 minutes is worthless. UNLESS you tell us how you made the filter. Sunglass filter??????? They sell them at the Mall at the sunglass kiosk???
PLEASE please please....finish your great idea with "how".

Thanks

Ed

DaleB 02-27-2017 12:13 PM

http://www.lmgtfy.com/?q=neutral+den...ter+gopro+prop

:)

Steve Melton 02-27-2017 04:02 PM

Quote:

Originally Posted by ChiefPilot (Post 1029091)
Came across this image on reddit, thought some here might find it interesting. It's a visual explanation of the rolling shutter effect on the prop on all the RV videos that get posted around here.


I liked it. I understand it now.

bulldogbuilder 02-27-2017 05:50 PM

DaleB,
I appreciate your attempt at education, but it left a lot to be desired. What makes you think that most of us have not already researched the web, and found simpleton answers. Only one spot (on the web) have I found real info. Example: A .6 filter will not remove the "banana", a .9 filter will remove it, but leave a wiggle, a 1.2 filter is better, but will not remove the wiggle, a 1.5 filter (.6 plus a .9 piggybacked filters) removes all the interference giving a perfect picture.
So here are three filter and an additional piggyback setup, all advertised as "prop filters". Only one is truly adequate. So using the word 'sunlight filter' means nothing. (in the eyes of people who build airplanes that is).

So the question still exists: who has the best, for the price, filter system, whether it be store bought, or home made.
Please note that no where in the above thread is the camera and lens shown.

This forum is for how I made this part in shop today, not what I made in shop.
So once again, please please please show us how

Ed

Steve Melton 02-27-2017 06:07 PM

dude.... relax

RV7A Flyer 02-27-2017 06:27 PM

Quote:

Originally Posted by bulldogbuilder (Post 1153730)
DaleB,
I appreciate your attempt at education, but it left a lot to be desired. What makes you think that most of us have not already researched the web, and found simpleton answers. Only one spot (on the web) have I found real info. Example: A .6 filter will not remove the "banana", a .9 filter will remove it, but leave a wiggle, a 1.2 filter is better, but will not remove the wiggle, a 1.5 filter (.6 plus a .9 piggybacked filters) removes all the interference giving a perfect picture.

Depending on the amount of light coming in, that is, which can be vastly different depending on time of day. And the effective ISO rating of the sensor. And the aperture size. AND the speed of the rolling shutter electronics.

This isn't that hard of a problem...buy some filters and run some experiments.

SMO 02-27-2017 06:31 PM

Sometimes they are not curved. I think my airplane is scared!



And no, I won't tell you how :D

Sam Buchanan 02-27-2017 06:43 PM

Quote:

Originally Posted by RV7A Flyer (Post 1153742)
Depending on the amount of light coming in, that is, which can be vastly different depending on time of day. And the effective ISO rating of the sensor. And the aperture size. AND the speed of the rolling shutter electronics.

This isn't that hard of a problem...buy some filters and run some experiments.

And the frame rate.

I find 60fps to be less susceptible to prop disc distortion than 30fps. And as mentioned, shooting at 60fps near sunset results in a nice prop blur...without a filter.

But I realize my attempt at education may leave a lot to be desired..... ;)

bulldogbuilder 02-27-2017 09:46 PM

I am relaxed, just get tired of less than adequate information. To educate to a small degree here is a you tube blurb that helps explain the differences in filters.

https://www.youtube.com/watch?v=mnwG-oSna0I

Now try to find enough info on filters being sold for the GoPr, most leave out the filter value, or worse, use a different measurement.

The gentleman that produced the above video is to be commended. In actuality his video should (by our standards) be 'just normal'. I.e. on average we, as airplane builders, have higher standards. (wife comments on the afore mentioned are to categorized as 'fake news'.)

Ed (relaxing with a single malt)

krw5927 02-27-2017 09:46 PM

Quote:

Originally Posted by bulldogbuilder (Post 1153730)
DaleB,
I appreciate your attempt at education, but it left a lot to be desired. What makes you think that most of us have not already researched the web, and found simpleton answers. Only one spot (on the web) have I found real info. Example: A .6 filter will not remove the "banana", a .9 filter will remove it, but leave a wiggle, a 1.2 filter is better, but will not remove the wiggle, a 1.5 filter (.6 plus a .9 piggybacked filters) removes all the interference giving a perfect picture.
So here are three filter and an additional piggyback setup, all advertised as "prop filters". Only one is truly adequate. So using the word 'sunlight filter' means nothing. (in the eyes of people who build airplanes that is).

So the question still exists: who has the best, for the price, filter system, whether it be store bought, or home made.
Please note that no where in the above thread is the camera and lens shown.

This forum is for how I made this part in shop today, not what I made in shop.
So once again, please please please show us how

Ed

If the camera and lens brand/type is so important (and it is), how do you expect an answer without revealing what kind you have?

Why not buy a couple inexpensive filters and create/test your own setup? After all, this forum is for creativity as well. Make it in shop and then tell us what worked.


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