Showing posts with label HDMI. Show all posts
Showing posts with label HDMI. Show all posts

Friday, October 8, 2010

Sunhood on the cheap!

A few months ago I acquired a 7" Marshall monitor (model V-LCD70XP-HDMI) which has proven invaluable in my wildlife video efforts. As with all quality items, it don't come cheap. To add to the sticker shock one must further purchase a battery (mine is a Sony BP-U60) and a charger for it: cha-ching! By the time the smoke cleared, I was into this thing, tax in, for over $1500 CDN. Ouch!

That said, this 7" LCD has paid for itself in three major ways:

1. Its larger screen is easier to see and, with the proper hotshoe holder (I use a sturdy Manfrotto 482), can be angled in any direction. This saves your back and really helps when shooting at low angles.

2. Its peaking filter is a major help in focusing while recording. Although I usually use the Canon 7D's 5X or 10X liveview feature to prefocus whenever possible, this ability to fine focus is lost during actual recording. The peaking filter overcomes this dilemma.

3. The false colour filter is essential for achieving accurate exposure. Histograms only give an overall exposure profile of the entire frame, the false colour filter shows the exposure level of each individual object and subject within the frame while recording. This was brought home to me while shooting a bright white egret on a sunny day -- its white feathers would have been blown out if not for the false colour filter enabling me to dial in optimal aperture/ISO/ND variofilter settings while actually recording.

But speaking of sunny days......

The 7" Marshall monitor can be turned way up in brightness to combat the overall glare of sunny surroundings. The screen can get washed out in direct sunshine. So, I priced the Hoodman 7" High Def Monitor Hood at Vistek in Mississauga: $119.95

WHOA!! $119.95? Plus tax??? (= 13% "Harmonized" Sales Tax in Ontario). No way!!!!!

On Twitter, I stumbled upon www.CoolLCD.com Previously an unknown site to me, it has interesting stuff. Of note was a 7" sunhood at ........ $16.20 Holy smokes! Possibly not the enduring quality of a $120 Hoodman, but that's cheaper than the tax alone on the Hoodman!!

With reckless abandon, I clicked "Add to cart". Going completely hogwild, I noticed they had a HDMI-miniHDMI cable only 0.5 meters in length at $5.90. Whack! "Item 2" got Added to Cart. Choosing DHL as a carrier, the cost of shipping was gonna slam another $20 to the total, but for about $40 I was good to go. I ordered on Thursday night, opting to use PayPal. It got processed on Friday. This shipment was out of China -- apparently they had a holiday weekend, so it didn't leave the China Mainland until Tuesday. It was in my hands Thursday morning -- less than a week from when I ordered it, with a Chinese Holiday thrown in. Not bad.

Here's what I got: (not counting the Marshall 7" monitor, of course)



The top edge had a strip of velcro fastener securely sewn in, plus it came with the narrow velcro straps you can see in the picture. These narrow straps are useless -- I snipped 'em off. Instead, I went to the nearest Fabricland and, for all of $3.48 bought a one-meter length of velcro 3/4" black velcro tape - the kind that you can peel off the white paper backing to stick the velcro onto a hard surface. This stuff:



I snipped off enough to cover the sides and top of the monitor (about 10") -- this is what the velcro edge of the CoolLCD sunhood affixes to. And it works! Take a look:



Here's a closeup of the velcro tape on the monitor:


As you can see, the 3/4" velcro tape fits perfectly without blocking any switches or ports. The sunhood is open at the bottom, giving easy access to the button controls at any time.

As a bonus, here is the small HDMI cable I also purchased at $5.90 (compared to the bigger one-meter HDMI cable on the left that I've been using up 'til now ):



It's actually only about 15" long or so -- but less length to deal with and less weight on the plugs to cause an accidental pullout at the worst possible time! Here's how it looks on the camera:



Compare this to the ungainly longer one (now my "spare" cable):




I was always worried I would accidently tangle or pull on this overly-long cable, and a couple of times I got an "ERR" message on my upper 7D display because one of the HDMI plugs had partially pulled out!

Finally, I have to thank my daughter's visiting kitty, "Daphne" for her unceasing assistance while I was trying to sort out velcro straps for the bench photos taken above:



OK, OK, that last bit was too cute, I know. It's Friday night, what can I say? Hey, any comments or Great Thoughts on the above? Put in the Comments/Great Thoughts section below!

Hope this is useful info for you!

Monday, July 12, 2010

Rack 'em and Stack 'em!

Wildlife video making presents its own set of challenges. Frequently the shooting is done in low light conditions at dawn and/or dusk. The subjects are often very small and timid, requiring powerful lenses to give decent image presence from a fair standoff distance away. The very nature of wildlife subjects means that they are likely to be very unpredictable in behaviour and movements. Finally, they are usually well-camouflaged against their background, requiring adept use of Depth of Field to visually isolate and separate them from their surroundings.

My still photography background dictates that the optimal photo equipment would be a high quality dslr coupled with a powerful prime telephoto with as wide an aperture as possible. Flash is not always practical due to the spooky nature of the subjects, the excessive distances involved (Better Beamers notwithstanding), plus the desire to use natural existing light where possible. Continual lighting with video shooting is completely out of the question for most wildlife settings.

Unfortunately, the prime telephoto lenses with large f/2.8 or f/4.0 apertures with long focal lengths (minimum 400 mm) are, for many of us, prohibitively expensive! In the past year and a half, I've acquired two dslr cameras, the Canon 5D Mark 2 and 7D that both offer superb low-noise photo & video capabilities at previously unheard-of high ISO's. This greatly assists shooting in low light with the smaller-apertured (but still high quality) 400mm telephoto lenses by Canon. Many wildlife photographers prefer Canon's prime f/5.6 400mm, which has a reputation for sharp capture and, in the case of still photos, fast auto-focusing ability. Personally, I opted for Canon's popular f/4.5 - f/5.6 zoom telephoto due to the flexibilty of the 100-400mm feature. (Zooming out to 100mm to actually acquire a small subject, then zooming in to 400mm is a real advantage -- saves a LOT of "hunting around" for an elusive target). Sharpness has always been good with this lens for me, and it does an admirable job of locking focus on fast-moving birds in flight when taking photos.

That said, everything changes when you try bumping up the focal length with teleconverters. With the prosumer Canon cameras you automatically lose autofocus, even with the addition of the 1.4x TC to a 400mm f/5.6 lens. Image quality does soften somewhat, and many photographers feel unacceptably so with the 2.0x TC. Does this apply to the Canon 7D's video side? Let's see:

Songbirds in the Backyard from David Rilstone on Vimeo.



Unfortunately, this downsized imbed from Vimeo doesn't have the sharpness that the full 1080p h.264 .MP4 export demonstrates. However, it certainly is sharp enough to see the fine feather detailing on the birds, as well as showing some good blurring in the background which places more focus (pun intended) on the subject itself. The cost of a 100-400m plus the two teleconverters --all combined-- is approx 1/3 to 1/4 the price of a single f/2.8 400mm prime (or a f/4.0 500mm or 600mm lens for that matter). No arguing that the bigger glass would give a better image than the zoom 100-400 + teleconverters, but are the stacked lenses a viable cheaper alternative? It depends on your circumstances and destination of your efforts. For professional National Geographic or Discovery/Life Channel work.....likely not. For casual enthusiast work or even some low end video stock submissions, I'd venture to say yes.

Some production notes:

Songbirds such as sparrows and robins are quite tiny in size and, in my neck of the woods, very timid in nature. This is problematic when trying to fill a video frame with the bird itself. Perhaps going a little overboard, I stacked two Canon teleconverters (1.4x and 2.0x) onto my 100-400mm lens and hooked all this onto my Canon 7D -- with battery grip. My small Manfrotto 501 spring head was almost overwhelmed with all this weight, especially when I slid a Marshall 7" HDMI monitor into the 7D's hotshoe mount to help me with focus and exposure.

The final focal length in terms of a "standard" 35mm full frame dslr worked out to be quite impressive:

400mm (lens) X 1.4x (TC) X 2.0 (TC) X 1.6 (Canon APS-C crop factor) = 1,792mm!!!

I had a real problem with vibration and shaking -- I was on a wooden deck (mistake) and it was a windy day. Definitely a heavy duty Miller tripod + head will be in my future. As it is, the inexpensive remote on/off switch available from Canon is a huge advantage in avoiding physically touching the camera -- any and all vibrations are picked up as camera movement with such a huge magnification factor.

I just picked up a Marshall 7" HDMI monitor at the recent Profusion Expo 2010 in Toronto. As Mr. Philip Bloom would say, "It works a treat". It made everything so much easier - focusing with a bigger screen is in itself very helpful, the inclusion of a peaking filter to verify focus is a bonus. Even checking exposure was easier with the false colour filter on this monitor. Finally, by its flexible hotshoe attachment it's easy to twist the monitor to face any direction, including up and down -- a real boon to anyone with an aching back from hunching behind a camera all day peering into a tiny 3" LCD.

I'm using the fabulous Adobe Premiere Pro CS5 with its new Mercury Playback engine on my i7 920 quad core PC. With its Nvidia GT285 vid card, this version of Premiere Pro can edit & scrub the 7D's h.264 .MOV files effortlessly, with only occasional rendering needed after some visual effects (highlights, USM) were added, along with a lowpass filter to knock out the persistant AGC hiss in the background. I'm holding on to my Cineform Neoscene, but find I'm using it less and less now that CS5 edits in floating 32-bit.

I've gone with Phil Bloom's recommended 7D custom picture style setting of completely knocking down sharpness and contrast (-4 notches each), and reducing saturation within the camera by 2 notches. This yields a fairly flat image which is easy to work on later in post.

I wanted to work at the maximum f/11 aperture to reduce DOF as much as possible to better isolate the subjects from the background. I eschew even the Singh Ray Variable Density Filter for telephoto work, preferring to use ISO as an exposure control (in this case generally ISO 320 worked well). Frame rate was set to 23.97 fps and shutter speed as close to 180 degrees as the camera would allow -- 1/50 second.

Hope the above provides useful information and I welcome any comments, questions, debate, thoughts, etc.