Virtual reality revisited

Better tools and some thoughts on Flash.

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I have decided to do some new work in Virtual Reality panoramas, having written extensively in these pages about the technique some four years ago. Snow Leopard refuses to let either PTMac – the software used to stitch the constituent images – or CubicConverter – which converts the stitched panorama into Virtual Reality format – work, so my first port of call was to ace panoramic pro UK photographer Rod Edwards. Rod has got this technique down and one of the most stunning examples of VR I have seen is his panorama of the famous Racetrack in California’s Death Valley which can be seen by clicking here.

Following Rod’s advice I settled on PTGui for stitching and Pano2VR for VR generation. Processing VR panoramas is a two step process – first stitch the constituent images into a seamless flat whole, then convert that image into a circular panorama which the viewer can pan at will in all directions, not to mention the ability to zoom in and out.

In the process I learned a couple of things. First, the software is now friendlier than before, though the Panotools engine used by PTGui seems identical to that used by the obsolete PTMac. Second, Pano2VR is an excellent tool making it easy to add sound, navigation controls and copyright data. But, most importantly, I learned how superior Adobe’s Flash is to Apple’s Quicktime. Yes, Pano2VR can generate VR files in either format. The Flash versions are half the size and offer far more control. Panning in Flash panoramas is also much smoother than the jerky alternative in Quicktime. Yes, the very same Flash which greedy piggy Steve Jobs has banned from the iPad. It’s ironical that Quicktime VR is no longer supported by Apple’s own latest version of their media player, QuickTime X, as they appear to be abadoning the VR format. But you don’t expect Apple to tell you that now, do you?

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So to play a jerky Quicktime VR pano you have to download the older Quicktime 7 if it’s not on your system. Let’s hope the anti-trust powers stomp on Jobs’s arrogance and force him to open the iPad to Flash. If not, the competition will see to it in any case, and I’ll be first in line for a tablet which plays Flash and has a built in SDXC card reader. What a jerk! Here’s a guy who has a monster ego and a huge vendetta against Adobe for some reason. A little power is a dangerous thing ….

As a quick proof of concept, I snapped six pictures of a loft interior using the Canon 5D and Canon fisheye lens mounted vertically on the King Pano panoramic head. The excellent King Pano remains available and I recommend it. You do not need a fisheye to use it but a fisheye lens is the way to go if you want to do 360 degree Virtual Reality panoramas. Even with regular lenses, the King Pano is immensely useful as it provides the correct nodal point offset for the camera, meaning your efforts to stitch images properly will be speedily rewarded. Determination of the right setting for rotation of your rig about your lens’s nodal point is not that hard, and well explained in many places on the web, including on this site.

As proof of concept, click on the picture below. I have added some Vivaldi to jolly things along and the whole thing takes a minute or so to download. I did not bother using HDR, though that technique is highly recommended in VR work owing to the huge dynamic range frequently encountered – look at the burned out windows as an example. HDR fixes that. Nor did I fill the zenith and nadir holes, concentrating on the core stitching functionality instead. So next week it’s off to Point Lobos to do the real thing. In the image below I used TIFF files for maximum definition and you are looking at the Flash version.

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Click to load and play the panorama. Use the mouse to navigate in all directions.
Will NOT play on an iPad.

To view a selection of my earlier panoramas, please click here. These use Quicktime7.

Disclosure: No connection to, or investment in, any of the companies mentioned in this article.

Adobe Photoshop Express

A useful iPad app.

I’m not sure what they are putting in the water coolers at Adobe Labs HQ in San Francisco, but they should definitely stick with the program.

First we got a really value added, fairly priced upgrade to Lightroom 3, many of whose enhancements I have written about here – film grain, superior RAW conversions, outstanding flexibility to remove lens aberrations and distortions – and now, at no cost, an iPad app named Adobe Photoshop Express.

The price is right!

It’s an inspired piece of programming which really ‘gets’ the touchscreen interface and one of the best efforts yet to make the iPad into a photo processing platform. Sure the controls are limited – basic exposure, sharpness, effects, frames, monochrome conversions and so on – but all the ‘sliders’ for the controls dictate that the user merely slides his finger across the screen to change things. Surely this is the future of photo processing? Further, sign up at Adobe and if you can get comfortable with access rights (theirs not yours) to your pictures, then you can sync your snaps to your desktop or laptop via their servers.

Here’s a simple snap of our son with a neat frame added – this is a screen shot as I do not have an Adobe online storage account:

Winston at Point Lobos. My ‘equipment man’.

Very worth while looking into and it seems some of the earlier bugs have been stomped on as I have had no issues with my version. And what have you got to lose?

More on Adobe lens corrections in Lightroom 3

Very clever indeed.

A friend wrote recently how much he was enjoying using the newly added built-in lens corrections in Lightroom 3 with his ultra-wide Nikon zoom on a pair of Nikon pro bodies, a lens whose profile is included with Lightroom 3.

This got me thinking. How can one-click corrections work when distortion varies so widely over the focal length range of many wide zooms? If the lens is pre-programmed into Lightroom’s database by Adobe you do not get a choice of focal length when applying the profile. It’s strictly a one choice affair, which contrasts with my approach when crafting profiles for the 9-18mm MFT Olympus zoom for my Panasonic G1, where I had to create disparate profiles for each of the four marked focal lengths. The barrel distortion of that lens decreases with increasing focal length, so it’s not possible to make one profile to fit all focal lengths.

Now one of the finer lenses for my full frame Canon 5D is the 24-105mm L zoom. Lightroom 3 includes a built-in profile for this lens unlike with the Olympus 9-18mm where I had to make my own. The Canon has fine resolving power and micro contrast at all focal lengths of its useful zoom range but suffers from the most atrocious barrel distortion at the wide end (the center of peripheral straight lines bows out), changing to mild pincushion distortion (the center bows in) at the long end. How could Adobe’s ‘one click’ approach possibly work with this lens whose distortion characteristics vary widely with focal length?

Note that if you use Canon’s DPP software (I do not) to process your pictures I’m fairly certain that it corrects distortion at all focal lengths. However, the 5D, unlike the G1, has no in-body distortion correction for the manufacturer’s lenses, so processing in LR3 brings in the images in their fully distorted glory just as with the G1/Olympus lens combination. And distortion correction is important to me as I frequently take architectural pictures where I want my straight lines straight.

Well, it was but a few moments work to take five snaps, one at each of the marked focal lengths, with a straight edge close to the top of the frame in each. I processed these through Lightroom 3 and, after making virtual copies of each, applied the one-click lens distortion correction to each of the virtual copies, selecting the single profile for Canon’s 24-105mm L lens in each case. The pictures were snapped at 24, 28, 50, 67 and 105mm.

Here are the results – in each case the corrected version is shown first:

At 24mm. Noticeable barrel distortion in the uncorrected image at right.

At 28mm. Mild barrel distortion in the uncorrected image.

At 50mm. Very minor barrel distortion in the uncorrected image.

67mm. Very mild pincushion distortion in the uncorrected image.

105mm. Very mild pincushion distortion in the uncorrected image.

So as the above pictures suggest, the Adobe built-in profile for the Canon 24-105mm lens takes into account the focal length at which the image was made and applies distortion correction appropriately. It may be ‘one-click’ for the user, but it seems there’s much more going on below the surface. In all cases the correction is almost perfect, with only the 67mm and 105mm images slightly overcorrected and showing mild barrel distortion. The correction at the wider focal lengths is especially praiseworthy, as the above pictures show. Very clever and much more sophisticated than the case where you have to make your own lens profiles in those instances where Lightroom 3 does not include these.

The Leitz close-up gizmo outfit

A new high in strangeness.

For an index of all Leica-related articles click here.

If the 20mm Russar and 400mm Telyt were odd ducks in my lens tool kit over the years, this one takes the biscuit.

It’s the Leica close-up kit marketed in the 1950s which I owned for many years. I say “owned” rather than “used” because it was much more fun to assemble this collection of hardware and play with it than it was to use.

The Leitz close-up kit.

What you see in the neat fitted box is my Leica M2 attached to a Visoflex I mirror housing. The housing is attached to the Leitz Focusing Bellows I fitted with a 135mm f/4.5 Hektor lens head and a compendium lens shade – the latter extendable at will for very effective shielding of the lens. There’s a fine 45 degree right-way-round prism finder lower left. An excellent Leitz ball and socket head is lower center. These are beautifully made and I continue to use a variant on my monopod with the Panasonic G1. Highly recommended if you can track one down on the used market – exceptionally engineered, very secure when tightened owing to the design of the ball and indestructible. Attach a QR plate and you are done.

It’s hard to put into words how beautifully engineered everything in this kit really was. Every component speaks to the very height of the machinist’s art and confirms that Leitz’s quality and finish had only one way to go once the fifties ended. Downhill.

The lens fitted to the assembled Visoflex I and Bellows I

The idea of a continuous focusing range from infinity to life size was not new at that time – large technical cameras with long extension bellows had been doing that trick for ages – but seldom had it been executed as elegantly as here, especially in the 35mm film format.

The fitted case also accommodated a dual cable release with adjustable pin lengths. The idea was that the longer pin would raise the flapping mirror in the Visoflex I and further pressure on the plunger would then trip the camera’s shutter. It worked well.

Double cable release attached to the Visoflex I.

Everything was designed just so, right down to the bracing blocks in the lid of the case which made absolutely sure that your precious gear would not flail about in transit.

Truly a fitted case.

A second finder in the kit provided a reverse waist level view and, as you can see, the mirror in the Visoflex I was well oversized, for better function with long lenses.

With the waist level viewfinder in place.

In practice the 45 degree finder was far superior, offering an unreversed image at chest height, and included eyesight adjustment. Perfect.

Focusing, however, was far from perfect. The plain ground glass screen in the Visoflex I had no focusing aids and lacked a fresnel lens, so light drop off to the edges was severe. You simply opened the lens up to its modest f/4.5 maximum aperture (nope,no click stops here) and then racked it back and forth either side of what you though was sharp until it looked as good as you could get it. Then, fingers crossed, you pressed the button or rather you depressed the plunger on the twin release, trying not to forget to stop the lens down first. Of course, as the lens was completely manual things went dark really fast, so that handheld photography was pretty much out of the question. Definition at f/4.5 was iffy and depth of field so shallow that only the very lucky tried to use this apparatus hand held.

The compendium lens hood just went to prove that the engineers and designers at Leitz, Wetzlar had spared no expense. Like everything else in the kit it was beautifully made, slipped into the front of the bellows focusing rack on two chromed rods and clipped neatly to the front of the Hektor lens head in the groove provided.

The compendium lens hood for the Visoflex I.

The Hektor lens head was ordinarily sold with a coupled rangefinder focusing mount but for use with this kit the head was detached from the rangefinder mount and inserted into an adapter tube for fitting to the Bellow. Leitz wallowed in an orgy of adapters for seemingly everything in those days and various other lens heads had to use specific types. However only the rare 125mm f/2.5 Hektor and the 135mm Hektor and, later, Elmar and Tele Elmar kens heads would focus to infinity. You could also fit the 200mm and 400mm Telyt heads if you could find a second tripod to support the whole thing. The 135mm Hektor was a decent pre-war four element design and gained anti-reflection coating during the war years, being replaced by the more capable Elmar and, later the even better Tele Elmar which was the last 135mm rangefinder lens Leitz made with a detachable head. The even later 135mm Apo-Telyt-M was strictly for use on a Leica M body, with a fixed head. It was quite superb for its intended purpose, as my copy testified, provided your Leica M’s rangefinder was properly calibrated. Many were not and only the M3 with its nearly life-sized finder could really do the lens justice at full aperture and close focus distances when it came to dead on focusing.

The Hektor lens head fitted to its intermediate collar.

It’s some reflection on how times have changed when this sixty year old gear is compared to a modern full frame DSLR. My Canon 5D fitted with the Canon 100mm f/2.8 EF Macro and a ring flash offers focusing from infinity to life-size in a standard focus mount – no bellows needed! – is auto focus and auto aperture, delivers quality which will knock your socks off, and is easy to use handheld. There’s even a costlier ‘L’ version available with anti-shake technology. As these things go it’s also relatively compact, if not lightweight. None of that could be said of the Leitz outfit but the craven functionality of the Canon gear lacks everything the Leitz hardware possesses in spades. Sheer physical engineering beauty.

I have taken more great pictures with the Canon gear than I can recall but cannot recall having taken one half decent picture with the Leitz outfit – which is why you see none her.

But it sure was nice to look at. I bought and sold mine, after many years of ownership, for a song.

A bargain basement G1

Snap one up while you can.

The Panasonic G1 is discontinued but remaindered new samples are still out there at a bargain price.

G1 pricing at Amazon.

The replacement G2 is $770, so the equation is simple. If the following new features of the G2 are worth $270 to you, get the G2:

  • A touch screen to focus the camera
  • A movie mode

And, of course, the 14-42mm kit lens on the G2 is now widely reported as being inferior to the 14-45mm version on the G1, and I can most certainly testify to the quality of the latter.

The G10 (lower quality movie mode) at $540 is not really an alternative to the G1. It has an awful EVF (one key reason you buy a G1/2 is for the excellent eye level viewfinder), drops the swiveling rear LCD display (not like I care about that and nor should you – LCDs are not a useful framing tool) and has the same lower quality 14-42mm kit lens.

The G1 at $500 strikes me as a real bargain for real photographers tired of lugging around their heavy APS-C or full frame DSLRs. I have had no reliability issues after nearly 7,000 frames over the past year. If you just want a G1 back-up body, it is not sold in that configuration in the US but I would bet you can unload the spare kit lens for $200 to someone displeased with the latest version. So call it $300 for a spare body. Not bad at all.

And if you want to join the cadre of elite users, like me, you can get the blue bodied version for a modest $40 more!

Further, if you want to get lucky, it seems that an iPhone and a G1 are THE winning combination:

As usual, Windows users are SOL.