why RED TWO must have optical viewfinder and a rotating mirror shutter.

[najafi/didarfilm]

Hi all my RED friends.
have a look:

http://www.redhax.net/wiki/Understan...tter_Artifacts

sometimes ago, i just discussed on the necessity of a optical viewfinder and a rotating mirror shutter for RED. all reasoning for not embedding it into RED was for camera body size and also the price.
Jim had a long experience in Optics industry so I know he can make an affordable solution for that.

best
Hossein

[Evin Grant]

There will most likely never be a Red 2, just the evolution of the Red One. That being said feel free to void your warranty however you see fit when you take delivery. A mirror shutter is an interesting an antiquated solution to a problem that doesn't see to exist in Red footage. The rolling shutter in the Red moves so fast that pretty much all of the artifacts you're concerned with are non existent. The only issue I've encountered is with hi speed photo flash units exposing half frames, but this happens even on film cameras.

[Kevin Halverson]

An optical viewfinder, while nice, isn't really essential as look around is provided based upon the sensor being larger than the captured image.

A mechanical shutter would be nice in some situations, but the behavior of RED's electronic one seems to be fine for nearly any application other than impulse events such as the unsynchronized, short duration strobe event that is referenced. Even this type of shutter issue can be avoided by using a strobe duration that is longer and synchronized to the camera's shutter interval.

The additional cost and complexity of a mechanical shutter is substantial, adding an optical viewfinder would be considerable more.

[Antoine Fabi]

euh...

excuse my ignorance, but if the rolling shutter moves so fast, so is the equivalent shutter speed ?

What about normal and relatively slow shutter speed ?

thanks

[Kevin Halverson]

The shutter speed is based upon the interval between the beginning of subsequent frames, not the interval between individual photosites during the refresh cycles.

[I Bloom]

FYI, that's a wiki entry. Subject to change and review. Please do.

I think some kind of third party mechanical shutter box might be the solution to these problems.

I believe the electronic shutter might also create issues with certain kinds projection, televisions, and other things that strobe, but I'm still experimenting.

IBloom

[Jeff Kilgroe]

The rolling shutter has greatly improved since what we saw with Crossing the Line. IMO, there isn't anything a mirror shutter is going to provide here to benefit the image. I see better arguments for an optical viewfinder, but still don't think it's necessary with the look-around and various focus assisting tools.

[nzben]

Originally Posted by najafi/didarfilm

Hi all my RED friends.
have a look:

http://www.redhax.net/wiki/Understan...tter_Artifacts

sometimes ago, i just discussed on the necessity of a optical viewfinder and a rotating mirror shutter for RED. all reasoning for not embedding it into RED was for camera body size and also the price.
Jim had a long experience in Optics industry so I know he can make an affordable solution for that.

best
Hossein

My understanding is that there is a spatial relationship between the back element of the lens, a spinning mirror, the low pass filter & the sensor. You can't put them all in together.

The genesis has no spinning shutter = no optical viewfinder.

The D20 has a spinning shutter, but no low pass filter (or the filter is too close to the sensor??) = dust resolving on the image a lot more. I haven't used the D20, so not exactly 100% on it's setup, but it is known to have more dust problems that the Genesis.

Some people also claim that turning the camera off when opening the port will reduce static around the sensor, resulting in dust being less being 'attracted' to the sensor. Any comments?

[jbeale]

Originally Posted by nzben

Some people also claim that turning the camera off when opening the port will reduce static around the sensor, resulting in dust being less being 'attracted' to the sensor. Any comments?

If that is a problem, I'd think it could be solved by a thin conductive layer on the low-pass filter that is electrically grounded. There are conductive materials that are transparent in thin layers, for example indium tin oxide. http://en.wikipedia.org/wiki/Indium_tin_oxide

[Charles Angus]

Optical viewfinding is one reason I love film cameras. You can see through it without batteries. EVFs tend to be more taxing on my eye for a long period.

That said, the main feature of the OVF is the overscan, which RED delivers. I still would probably prefer optical, but its a slight comfort/convenience thing.