[abonnement gratuit]

the author

Emmanuel Bigler is a professor in optics and microtechnology at ENSMM,
Besançon, France, an engineering college (École Nationale Supérieure
d'Ingénieurs) in mechanical engineering and microtechnology . He got
his Ph.D. degree from Institut d'Optique, Orsay (France). E. Bigler
uses an Arca-Swiss 6X9 FC view camera.

ENSMM, 26 chemin de l'Épitaphe 25030 Besançon cedex, France
Mail

 

Buy Arca-Swiss Products on
www.arca-swiss-magasin.com
 

 

 

 

The new 
Arca Swiss Misura® 9x12-4"x5" Monorail "Field" View Camera

(Version Française)


The challenge that Arca Swiss are addressing in the development of the new Misura® Monorail "Field" View Camera is to design a metallic monorail view camera for the International 9x12-4"x5" format and back, being both expandable and as compatible as possible with the present Arca Swiss system, and being also the most compact and lightest system monorail camera on the market. The only non-compatible feature in the Misura® is the smallest dimension for bellows attachment to the rear standard, an intermediate dimension between the 110x110 mm of the 6x9 frames and the 171x171 mm of 4"x5" F-line frames.

At the beginning, there is a nice and very ambitious project in mechanical engineering to optimise the existing F-line camera system in 6x9 and 9x12-4"x5", including the current "field" model based on the 6x9 front standard, a 4"x5" rear standard and a tapered bellows (a similar model is used by Jack Dykinga). This "field" model is already an optimisation in weight and size with respect to the standard 4"x5" F-line with "square" bellows. To go further in reduction of weight and size, not a simple task, Arca Swiss has concentrated the efforts on two points:

  • reducing the size and weight of the rear standard frame to the maximum possible, keeping a full compatibility with the well-established International 9x12-4"x5" ground glass and cut film holders;

  • reducing the weight of the rear function carrier which features shifts only, but no tilts nor swings.

This last point, no rear tilts nor swings (but full shifts), seems to be the most controversial among view camera aficionados. In the discussion, many passionate users of lightweight field cameras do not mention the fact that many folding field cameras have only reduced possibilities of rear tilts and swings, sometimes they do not feature any rear tilts or swings at all and limited rear shifts, if any.

Even the legendary Linhof Technika® offers only +-20 degrees of rear tilts and swings, but, at least there are some available. Look at the specifications of field cameras, consider the relative tilt+shift angle allowed combining front+back, and you'll realise that a single Arca Swiss function carrier already offers a substantial amount: plus or minus 35 degrees of base tilts, and plus or minus 45 degrees of swing (in fact more than that: on Arca Swiss function carriers, swing is only limited by the bellows). On the Misura® now in production, there are additional tilt possibilities thanks to the Orbix® "rocking" device built in the front standard. The combination of base tilts plus the Orbix® allows the camera to be totally yaw-free even in the most complex combination of tilts.

Starting from +-35 degrees allowed by base tilts, the Orbix® adds an additional +10(up)/-15 degrees(down) amount of tilt, hence allowing a total of +45/-50 degrees ; those figures are close to what the Linhof Technika® offers when you do not tilt the folding base plate: +30/-30 (front standard) plus +20/-20 (at rear on camera body) to reach +50/-50 degrees. The Technika® allows on top of this an additional -15/-30 degrees dropbed capabilities; but who will ever need +50/-80 degrees of total tilting capabilities?

As far as swing is concerned, the Technika® offers +15/-15 degrees in front, for a total of +35/-35 combined with rear swings. The Misura® offers +45/-45 in front (actually, limited by bellows only), but again how often will one need more than 30 degrees in all tilt/swing directions?

For example with the Misura®, you'll use most of the time the +10/-15 tilt capability of the Orbix® to achieve a classical Scheimpflug setup in landscape photography; you may add base tilts in a more complex situation if you wish.

Arca Swiss function carriers are designed to firmly support up to a 8"x10" standard without trouble. The consequence is that this part of the system, even if it is extremely compact compared to similar devices used by other manufacturers of monorail cameras, plays a strategic role between the rail and the heaviest standard. Its weight is an important part of the total weight of the camera. In order to reduce the total weight, Arca Swiss proposes with the Misura® a lightweight system monorail view camera for field use which is in fact less limited in tilts and swings than many folding field cameras. Actually, the Misura® is probably the lightest 9x12-4"x5" monorail view camera fully expandable within a comprehensive range of parts and accessories.

Let us examine a few practical situations where rear tilts & swings are not really necessary:

  • portrait photography: no problem, you'll probably keep the film plane vertical and the rail horizontal, you can use any amount of shifts, drop or rise upon request;

  • landscape photography: hardly any problem, you'll keep the film plane vertical (except if you wish to exaggerate perspectives), the rail is horizontal, the front tilt allows you to expand the sharpness limits to an horizontal object plane as usual according to Scheimpflug's rule, 10-15 degrees will most of the times be sufficient; the Misura allows +50/-50. In a camera allowing rear tilts like the classical Arca Swiss F-line, you could reach a relative tilt angle of 90 degrees (2x45); this extreme setup is hardly ever useful in landscape photography, most probably you'll be limited by lens coverage and bellows vignetting issues. If you want to exaggerate perspective rendition like with a rear backward tilt, with the Misura® you'll have to tilt the whole camera upward and compensate with rear rise and front tilts; the result will be strictly equivalent.

    An additional remark. If you've read the classical textbooks on view cameras like the course by the Canadian photographer Pierre Groulx (in French) or the beloved Ansel Adams Trilogy ("The camera, The negative, The print", unfortunately to French readers, they have never been translated into French, but they are available in German) you probably know that a very classical view camera setup consists in tilting the whole camera downward with all movements zeroed, like with a conventional 35mm or medium format camera, then applying a rear backward tilt to avoid unwanted convergence of vertical lines. This is in fact an indirect rear rise combined with an equivalent front tilt, you can achieve exactly the same setup with any camera without rear tilts if you are allowed front tilts and sufficient direct rear rise capabilities with a very flexible bellows. You guess the answer: the Misura® of course offer both features. Rise/drop capabilities of the Misura® read as follows: total rise (front+rear): 78 mm (60+18, upward), total drop: 67 mm (85-18, downward). Shift capabilities: front: +-30 mm, rear: +-70 mm.

  • architecture : usually for a classical architecture shot of any building (this has been confirmed by Henri Gaud, a French professional photographer, specialist of monastic architecture who works like this on a daily routine), the most important movement is front rise, the film plane being strictly kept vertical like the vertical lines of the building...  this assumes a classical building with vertical lines ! OK now you want to apply some degree of rear swing for perspective control (I've carefuly read the book by Pierre Groulx, I definitely want to apply the same effect as demonstrated in the book for Montreal's church!). No problem, but using the Misura® you'll have to operate differently. You'll have to transfer the desired rear swing angle to the front and apply a generous amount of shift. Be it swing or tilts, only the relative angle between the subject, the front and rear standards are important, not the relative angles with respect to the rail. If you use a ball head, or even a 3-D pan+tilt head, you'll have no trouble to compensate for the camera position.

  • complex studio shots with complex movements: clearly the Misura® has not been designed with such subjects in mind. If most of your work deals with studio shots with complex movements, you'd better use a classical monorail, for example a classical F-line or any monorail view camera with full front+rear movements.



Summary of rise/drop swing/tilt capabilities of the Misura®


Front base tilt

+-35°

Additional Orbix® front tilt

+10° / -15°

Front swing

marked +-45°, limited only by bellows

Front shift

+-30 mm

Rear shift

+-70 mm

   

Front rise

60 mm

Total rise front + rear

60+18 = 78 mm

Total travel rear standard

85 mm

Total drop front + rear

85-18 = 67 mm

   

Rail length

32 cm, folding 15cm+17cm


Note : in order to reach 78 mm of front rise with the 4"x5" format (actual image size: 96x120 mm) without being limited by the lens, an image circle of about 280  mm is needed.




Conclusions :

  • the Misura® camera without lens or film holder and without the protective base-plate and case, weights a little more than 2kg (2.050kg, 4.66 lbs), less than the smaller 6x9 F-classic (2.1 kg)

  • when you'll start using the Orbix®, you'll probably never consider any other kind of tilting device ...

  • a single leather bellows, extremely flexible, covers all focal lengths from 35 mm to a 400 mm telephoto,

  • the Misura® uses the smaller 110x110 mm lensboards like the 6x9 or the classical 'field' 6x9-4"x5" F-line models, those boards are much smaller than the 171x171 dimension of "square" 4"x5" F-line cameras,

  • the Misura® folds inside a protective leather or metallic shell certainly not as compact but as efficient as the folding baseplate of a folding field camera; of course the lens can be kept mounted on the camera.




Considering the Misura® only for 6x7 or 6x9 shots on rollfilm would be a pity, taking into account all the optimisation done to reduce size and weight of a system monorail camera fully compatible with the International 9x12-4"x5" ground glass and film back. However if you are an uncompromising "rollfilm LF photographer" and if you like panoramic shots, adding a 6x12cm panoramic rollfilm back to the Misura® will easily transform the camera into a "rectilinear" panoramic camera, to which you can fit almost any lens available on the market, moreover capable of more movements than any specialised 6x12 panoramic camera. And if you are interested by "panoramic stitching" of any ultra-classical panoramic landscape, say, a panoramic view of Delft, a panoramic scene of hunters coming back home in winter, a panorama to the Matterhorn seen from the Gornergrat or a grand view over the Great Aletsch Glacier from Bettmeralp, Galerie Photo will kindly explain in detail how to do it successfully...

(05/07/2004)

 

 

Buy Arca-Swiss Products on
www.arca-swiss-magasin.com
 

 

 

   

 

 

tous les textes sont publiés sous l'entière responsabilité de leurs auteurs
pour toute remarque concernant les articles, merci de contacter henri.peyre@(ntispam)phonem.fr

une réalisation phonem

nouveautés
galerie
technique
matériel
stages
adresses
librairie
boutique amazon
magasin arca-swiss 

plan
forum
liens
contact
radio-labo

abonnement gratuit
recherche sur le site
(chargement lent en première utilisation - veuillez patienter)