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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Lens...Camera....or operator issue?

A

Andy Post

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Hey Thrill Seekers...

Loving our new Raven. Took to the road and to the sky last week. We were also testing lenses. We were using a Canon 14mm and really liked the contrast, sharpness and lack of flare when we got near the sun. BUT...we saw this a few times.

We'd see this array of...well don't know what they are. That's the question. The vendor who rented us the lens suggested it was some sort of reflection off the Autofocus points in the camera. Didn't even know it had them.

So do I just need to be more careful of framing, or more discerning in lens selection?

Share your thoughts...
 

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It's a camera thing. OLPF thing, specifically.

Jeff Kilgroe said:
Those red dots are typically called OLPF FLare or Sensor Flare. It's caused by light reflecting off and back onto the sensor between the sensor and OLPF or sensor and/or OLPF and the reare element of the lens. Pretty much every camera out there will exhibit this under the right conditions, which is typically a very bright light source (sun) and a very small aperture. It's not a lens flare... It's been discussed here off and on over the years, and on other camera forums as well. I've seen it on every digital camera I own at one point or another. It shows up differently on different camera and sensor designs. But yeah, seen it and/or can duplicate it on Alexa, Nikon, iPhone...
Click to expand...
 
Smaller apertures will normally bring out this situation. It's an unfortunate known issue in the LLO and, to some extent, the standard OLPF as well. (Although I was really hoping that the RAVEN Standard OLPF would have fixed this issue.)

However, lens design may have some influence as well. I threw a crappy 18-55 Nikon kit zoom onto my DRAGON and was able to reproduce the red orb pattern at F3.5 (which is wide open for that lens.)
 
 
Daniel Kelly Brown said:
Unfortunatly the only OLPF that eliminates this is the STH olpf. In my experience it does seem to be worse with certain lenses.
Click to expand...

No olpf eliminates this... A lot of ND instead of stopping down helps.
 
Yeah...we just got the camera and hit the road. I rented a wider lens that would only accept written gels in a slot on the back of the lens. It's been years since I had those things around and didn't consider that I'd have to stop down so far. So I will count...breath...and find a way to rig some ND on my lenses. (I'm primarily flying...so matte box is out)

Thanks for the feedback and Links.....
 
Blackmagic cameras do this too. In stressful conditions, like daylight or interior or the camera being on....
 
Brandon Shafto said:
Blackmagic cameras do this too. In stressful conditions, like daylight or interior or the camera being on....
Click to expand...

When the camera is on? You should never do that, don't turn on the camera, then you'll get all sorts of errors :tongue_smilie:
 
So just to be clear, which is a better OLPF in this regard: the Standard or the Skin-Tone?
 
Andy Post said:
Yeah...we just got the camera and hit the road. I rented a wider lens that would only accept written gels in a slot on the back of the lens. It's been years since I had those things around and didn't consider that I'd have to stop down so far. So I will count...breath...and find a way to rig some ND on my lenses. (I'm primarily flying...so matte box is out)

Thanks for the feedback and Links.....
Click to expand...

A few weeks out from being in stock - but I have your solution ;)

KipperTie internal ND kit for Raven
 
Jim McKinney said:
So just to be clear, which is a better OLPF in this regard: the Standard or the Skin-Tone?
Click to expand...


Less on the skintone. But still have to avoid capturing at F22, 16, 11 etc. That is where the problem id pronounced, in small diaphram exposure and angle of light to the lens. It is the light repeatedly bouncing off the OLPF and the back of the lens. That is what creates the pattern.

David
 
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