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Messages - Aglet

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Canon General / Re: Help design a time lapse rig
« on: August 28, 2013, 12:48:25 PM »
Then you have to take into account how to program it. I can make it so it will slow down during a curve but what if someone moved the position of the curve? Now you have it going fast through the curve and slowing down during a straight portion of the track; programmatically it would suck using a system people can manipulate. I would have to remove the ability to slow down during a turn because the program wouldn't know where the turn was; if that makes any sense.

program could use total track distance as measured (or add up pre-programmed common pieces) and then the director specifies a velocity profile for the entire distance, you'll know where the curve is.

As an alt, use a hardware trigger (optical, mechanical) for telling the controller what section of track it's on.  Could be used for straight and curved, could even ID them with an IR sensor and markings on track.

It should not be significantly more complex.  If someone changes the track, they need to redo the velocity profile with the new track shape & length.

Like I said earlier, being able to adjust aperture isn't going to be possible. The only communication the program will have with the DSLR itself is when to open and close the shutter.

It's just more stepper motor utility channels to control the shaft on a cine lens rig; useful for AE operations.
Again, all these stepper motor channels can be GUI programmed using something like the velocity profile/track length for a simple, consistent interface that's relatively intuitive. (I'm supplying you patentable ideas here! ;) )
Ooops, actually not.  Just hosed that by providing published public disclosure here with witnesses.  :D

Use multiple strip-chart type graphs of the computed total track length in x-axis; display them one above the other so you can see how they all line up and compare the functions relative to each other.

Each chart displays an active dolly-camera function.
- velocity profile on one (top)
- shutter activation period profile (if not constant this allows return to real time as I suggested)
- pan profile
- tilt profile
- focus profile
- aperture profile

MORE OPTIONS - auxiliary function profiles
- more motion channels
- lighting control channels
- filter control channels
- anything anyone could possibly think of adding control channels (binary output trigger points, analog control outputs for light intensity controllers, etc.)

you don't have to incorporate ALL these functions initially, but allow for them.
But if you want to build the best, most cost effective rig, then these FEATURES will really set you apart w-o adding much hardware development cost and the software is all parallel structures to manage these using the time-distance baseline.
VERY DOABLE, very simple interface. checkbox for what function channels you want active, define the curve on activated ones graphically with the option of numerical entry fields to be precise. (Again, national instruments SW does this in its sleep)

I'll stop now.  When I start inventing (this is partly what I do for a living) I don't stop until I've built a Rolls Royce or Bugatti, then I pare it back down to fit the budget. :}

...I do think the Tamron handles the transition from focus to defocus more smoothly than the Canon.

I was never pleased with the (latest) Canon's rendition of transition areas; went from busy to garish to, "what's that other stuff in there?"
I'm thinking of getting this Tamron in F mount to replace or complement my Nikon 70-200/4vr.  Also a very sharp lens but suffers from similar transitional area bokeh ugliness.  (but it's so small and light..)

Landscape / Re: Beautiful sunsets
« on: August 28, 2013, 04:47:26 AM »
Wow!! No edits? I'm impressed! What settings do you use? Iso? shutter? ND filter? I have the hardest time with sunsets/sunrises.. Tips please!!

for me:
- full manual usually
- no filters
- lowest practical ISO based on focal length and shutter speed
- aperture for required DoF
- shutter speed to expose w-o clipping highlites (you may be over-exposing and losing color and detail if you relay on camera metering)

and it helps to find a location where you can actually get some vivid sunsets/rises!
dusty prairies are great, and the closer to the earth's poles you can get then the longer these events last.
In northern Alberta in summer, sunset colors like this can go on for an hour or so.  Much of it after sunset.

Canon General / Re: Help design a time lapse rig
« on: August 28, 2013, 04:41:08 AM »
Might just be me but those great videos made with time lapse and camera movement are starting to all look alike.

Add the ability to do non-linear camera speed on that rail in the process and that'll be a nice feature.
Think like an engineer. :)

Are you talking about having a curved or circular rail? If so, I'm way ahead of you.  ;)

I've thought about curved track but those become "hardware options." (how many different radii can you build and stock?) 
Perfect for some applications, for others, I'd rather the pan-tilt control and as someone else mentioned, build onto that with zoom and focus pull options too.  May as well motorize everything that can be motorized.
And yes, Lego Mindstorm/National Instruments may be a good place to start for such an application.  NI developer edition is bloody expensive but you can then spin off standalone apps that can be sold, maybe by now also compiled for iOS and Android.

Would be nice to accelerate the dolly, along a straight stretch then slow down around a 90 degree curve and come to a decelerated stop.  All the while the camera pans and maintains focus on a nearby subject, like a growing seedling?  Then zoom out while maintaining focus, smoothly adjusting aperture for rapidly increasing depth of field to put the thing into environmental context over a much shorter period of time, actually accelerating back to real-time.

And I'm not even a director ;) - but I can imagine being able to do such a shot would excite a lot of people in the film industry.  Great way to add some zip to a documentary!

tantalizing rumor for something big in 2014..

read near bottom..

Canon General / Re: Help design a time lapse rig
« on: August 28, 2013, 12:00:09 AM »
Might just be me but those great videos made with time lapse and camera movement are starting to all look alike.

Add the ability to do non-linear camera speed on that rail in the process and that'll be a nice feature.
Think like an engineer. :)

- pan-tilt ability too, also non-linear
- software that can help set up the shoot by automatically calculating the necessary movements, like pan-tilt and motion for precise tracking of sky or very close subjects.  Could base it partly on GPS & compass direction data from tablet/cell phone.  iOS/Android app to do all that and DL the data to hardware controller.

I'll add more if I think of it.

Canon General / Re: is expensive sensor tech paying off?
« on: August 27, 2013, 11:57:40 PM »
Well, if you consider their new, low-cost a3000, they could be looking to grab a bit more of the low-margin, high volume consumer end of the market... And they might at that price!

PowerShot / Re: Canon PowerShot G16 Announced
« on: August 26, 2013, 10:41:48 PM »
dpreviews published test shots show its hi ISO is improved over the G11/12 by a considerable amount.
Also, the faster lens makes for slightly shallower depth of field ability.
not yet sure I'd buy one, my G11 still does what I need it for, but the 16 would allow me to do a few more things with it.
.. and a few less w-o the swivel display.

EOS Bodies - For Stills / Re: 70D features vs 60D
« on: August 26, 2013, 02:38:13 AM »
CAMERALABS guy is posting his in-progress, production-model 70D review.  Not a lot there yet but the video AF looks to be pretty decent for those who need such.

12 There are almost no zooms that can resolve the 24.3 mp FX sensor well in current Nikon zoom line (maybe the 70-200VR2 and  200-400f4VR2 are fine), so if you are zoom shooter , you are wasting much potential resolving power of the high resolution sensor of the Nikon. I , in fact , recommend Zeiss  primes and 70-200mmf2.8VR2 for the Nikon , nothing less than that is really good enough for that sensor. the Nikon 24-70mmf2.8G ED , 16-35mmf4VR , 24-120mmf4VR, the 70-200f4GEDVR are all useless , they were great on 12mp generation bodies but not on the D800E or D600.

I can pretty much agree with your whole post but have to say the Nikon 70-200/4 VR that I have on my 800e delivers excellent sharpness in a much smaller lighter package than the new 2.8 and will much less focus breathing as well.
OTOH, the Nikon rep did have to remind me that, "it's a consumer-grade lens, not a pro lens," so basically stop complaining that VR doesn't work for long at -20C.   :-X
I still have a quibble with it on image quality but knarly bokeh in transition zones is not uncommon on some lenses in this range.

HDR - High Dynamic Range / Re: Post your HDR images:
« on: August 22, 2013, 01:26:33 AM »

I DO like this one, very good.  Sets the imagination stirring.

PowerShot / Re: Canon PowerShot G16 Announced
« on: August 22, 2013, 01:24:22 AM »
no GPS? seriously!  ???

Zactly what I was just wondering... 
Don't want to carry another device to geotag after a WiFi xfer, may as well just shoot the geotagged shot w the tablet.

Landscape / Re: Beautiful sunsets
« on: August 20, 2013, 03:11:54 PM »
Believe it or not, neither one modified in post AT ALL

I B'lieve! :)
I love good sky and, when the atmosphere's just right, even OOC jpgs look great.  Here's a partial sample from a series I took a couple weeks ago.  Incredible colors, for a while it was like a caramel candy fantasy.
I skipped some socializing to capture these.  Fortunately my friends understand and even saved me some supper. :)

EOS Bodies / Re: Canon 6D Under-Exposing?
« on: August 15, 2013, 06:37:22 PM »
I have not had issues between metering modes and within a same scene.  It's just dark, and if indoors, off color.

I haven't played much with a 6D but still find that is unexpected behavior.
Everything that I've used with that 63 zone metering sensor has provided excellent metering and AWB.

Can you compare your 6D with another, side-by-side, same lens?

EOS Bodies / Re: Canon 6D Under-Exposing?
« on: August 15, 2013, 06:30:42 PM »
Good to hear the 7D2 is reliable and accurate. That's going to keep a lot of people happy in the future  ;)

HAHA!  Good of you to jump on that typo (fixed).
so many multigenerational devices...
Still hoping a 7d2 is going to be impressive for more than its forebear's metering.

Meanwhile, back to metering SNAFUs...

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