Aperture variance due to Zoom?

[Joshua Brown]

I suppose this cauld be a little early to ask such a question since we havnt even seem any working prototypes (that I know of). I presume, however, that subsystems not affected as much by ASIC design have already been long in the works. So I hope RED can chime in here.

I know you strive for quality in optics and seeing your RPPs and RPZs in use on set I can say I'm happily suprised at your cost/quality tradeoff. In the scarlet package you will obviously be targeting a lower cost and thus lower featured market.
In many low cost optics I've experience the phenominon where your apertures maximum fStop is available at the widest FOV. However when zooming in you loose almost a stop.
Has the lens on the fixed Scarlet been designed to lessen or eliminate this undesired feature? I could always shoot at a wide angle and correct distortion later, but it would be nice to have a constant fStop through the range.

-JABrown

 

[Jim Retar]

I'm 99% sure it has a constant aperture throughout the range.

 

[G Lap]

The last published information showed the 2/3rds Fixed Scarlet having a 28-224 (FF35 equivalent), constant aperture, T2.6/F2.4 zoom lens.

These threads have some useful info: http://reduser.net/forum/showthread.php?t=45431http
//reduser.net/forum/showthread.php?t=22619

 

[Joshua Brown]

Thanks to both of your for the information.
George, in the last link you shared i found this little quote by Jon Sagud (an apparently "straight shooter") ..."The 8X constant aperture f2.4 lens"...

So it would seem that is their target. Hopefully they've hit it.

-JABrown

 

[David Rasberry]

I have no doubt that it will be constant speed through zoom. It is a pretty fundamental requirement for a decent professional grade zoom for a motion picture camera. Only zooms with extremely wide range, like 20:1, tend to depart from this norm.