CV 15mm vs CV 21mm

I really like the shots you posted Marc. I have had a couple fingers in my shots with the 21mm too. Part of the learning curve I guess.
 
Great work with the Heliar, Marc! After viewing you work, I feel like a hack with mine. I had a finger or two in the frame when I first started using the 15mm. But I truly love the unusual perspective of the lens. The X-Pan'esque crops work fairly well, too, I think. I haven't tried that yet.

I'm impressed by the verticals and horizontals in all the images. Did you use a bubble level with the lens? Or are they corrected in PS?

Again, great work!
 
Chris, all shots are the complete negative except the "X-Pan" crop and I didn't use a level. I was sincerely expecting problems with my alignment. I used the 15mm viewfinder as I would normally with the camera's viewfinder. I relied on the sides of the finder to judge verticals and horizontals. For leveling, I either went voluntarilly for a tilt on some shots and relied on my vision to judge if I was leveled when I needed it.
 
one last word. 15 lens is called aspherical, then I understand it's not a fish eye, but this feature is not mentionned for the 21 lens. Is it because it's obvious than a 21 lens is not aspherical ?
 
Marc Jutras said:
Chris, all shots are the complete negative except the "X-Pan" crop and I didn't use a level. I was sincerely expecting problems with my alignment. I used the 15mm viewfinder as I would normally with the camera's viewfinder. I relied on the sides of the finder to judge verticals and horizontals. For leveling, I either went voluntarilly for a tilt on some shots and relied on my vision to judge if I was leveled when I needed it.

Hi! Marc,

I also relied on the framing sides of the viewfinder to judge verticals. It's really need some practice for me to familiar w/. the lens.😀

Keven
 
does aspherical improve line rendering ? (my english is poort), I mean is there less distorsion and a more natural rendering with an aspherical lens ?
 
Laurent, since you are in Paris, I translated this to French from Canon's website. The translation may be off a little here and there, but it was free.

La Lentille de Aspherical Exigeant la Précision d'Ajustage de 0,1 µm ou Moins

La lentille sphérique généralement utilisé pour la photographie a un sort théorique : c'est impossible de converger des rayons parallèles à un point. Puisque beaucoup de lentilles sont combinées pour le corriger, il y avait des limites dans atteindre de qualité supérieure d'une lentille de grand-ouverture et le caractère compact de lentille. Mais ces limites peuvent s'être cassées si vous utilisez la lentille de aspherical avec l'idéal a courbé la surface qui peut rassembler des rayons à un point. Mais c'est difficile à faire la lentille de aspherical, et pour la surface courbée délicate résolue par le calcul exige en fait telle précision d'ajustage comme 0.1µm ou moins, et avant que la technologie de production en série a été établie, les artisans consommés avaient poli manuellement des lentilles un à un par leur perception et leur expérience. En plus, ce n'était pas si facile à mesurer la précision de la lentille produite à cause de l'absence d'instruments pour mesurer le niveau de 0.1µm ou moins précisément.

La très élevé-précision Mesure la Technologie : la Première Etape dans l'Investigation de Précision de Lentille

Afin de fabriquer en série la lentille de aspherical si difficile être faite comme la lentille de rêve appelée, le Canon a empoigné le développement de théorie de conception, la technologie d'ajustage de précision, et la précision mesure la technologie. Pour la précision mesure la technologie, nous avons établi l'extrême-haut précision mesurant la technologie de contrôle avec la précision à mesurer de 0,02 µm (le 2/100,000 mm) utilisant l'interféromètre laser pour mesurer de longueur. Nous avons établi aussi la technologie de production en série au moyen de la précision NC meulant/uniforme polir le aspherical extrême le système d'ajustage. Ainsi nous avons développé la lentille pour la seul-lentille appareil-photo réflexe adoptant une lentille de aspherical de sol pour la première fois dans le monde.

La réalisation de Technologie de Production EN SERIE pour les Diverses Lentilles de Aspherical pour Rencontrer de Diverses Applications

En plus de la méthode de polir direct de lentille, le Canon a développé beaucoup de technologies de production en série pour la lentille de aspherical y compris la technologie de moule en plastique pour mouler des lentilles en versant le matériel en plastique dans un moule de aspherical précis, la technologie de fac-similé pour mouler aspherical en placant ultraviolet-guérir la résine sur la surface d'une lentille sphérique, et une technologie de moule de verre directement pour appuyer le verre avec aspherical meurt. Ces technologies sont utilisées dépendent sélectivement de la précision de lentille, de l'ouverture, et du prix, se rendre compte de qualité supérieure, le caractère compact, et le poids léger de diverses lentilles d'appareil-photo, les photocopieuses, LBP, etc.

Activement Utilisé aussi pour Filmer

La lentille de aspherical pour créer des images supérieures sont aussi utilisées pour les caméras. Le canon a développé des lentilles pour 35 mm filmer demandé par l'Association des Producteurs de Film Américaine. Le K interchangeable de lentille-35 feuilleton adoptant la lentille de aspherical a reçu le deuxième Prix de Division Science DE TECHNOLOGIE de Prix d'Académie en 1977.
🙂
 
Merci beaucoup Chris !!! It's just so kind of you for taking so much time to translate all this long text.
It's always warming me up to meet french friendly speaking people !

Kind regards, Laurent
 
Hello again,

As I promised, here is one of my first pics with the 21/4. It's also the first scan with my new Minolta 5400 film scanner, which I think will have a far greater learning curve, so please forgive any deficencies in that regard. It's a view of the Thames in central London:
 
I like that lens, mine needs to go for a walk again.

Jordi, Photo Village and Cameraquest are the official US distributors for the CV gear. They do tend to be pretty fairly priced here in the States, and from you all say, they are low compared to other dealers around the world.

There is a nice 21 on ebay (US) right now, with LTM/m adaptor and case.
 
iMacfan

I have been itching to get a CV 21 for a while and your photo and others are really convincing me to do so. We are both users of the Minolta 5400 so I want to ask how do you like yours?

Nikon Bob
 
This is literally my first scan with the machine, with no corrections at all (no ICE, no USM...). So, considering that, I'm pretty impressed with the overall quality of the image, but can't judge the quality at top res just yet. I must say that it seems a bit slow doing the scans, but this is made up by the hilarious and frankly rediculous noises and how it moves the film holder from side to side etc... All in all nothing too much to complain about just yet.

David
 
David

You can PM or email me on the Minolta 5400 and maybe we can help each other out at times. I don't want to hijack this thread .

Bob
 
Like many other posters on this thread, I'm also having some diffculty deciding between a 21mm and a 15mm...

After reading the first few posts here talking about the difficulty with the 15mm, I thought I had found my answer, and was about to go for the 21mm...

But then I saw dingo's and marc's shots with the 15mm.... and I'm back where I started. 🙁

It is so difficult to decide which focal length you're more comfortable with... when you can't try out the lenses yourself.
 
Maybe you can borrow or rent? I think in general the wider you go the fewer opportunities you get. The thing is that when you do capture something well the reaction to the shot is always dramatic, and that is as true of a 21 as a 15.
 
Both lenses are very very wide... the wider you get the more challenging it is to use, and the more specialized the application. There's nothing quite like the 15 when you really need it, but OTOH it's far from a "normal" view of the world. The next more extreme step can only be the fish-eye lens.

I have the 15 and 25mm lenses. The 25 gets a whole lot more use, while the 15 sits in its case awaiting those special events. I think the 21mm might be about the widest "walking around" lens, and it's deservedly popular. See Alan Soon's 21mm shots in Istanbul:
http://www.photo.net/photodb/folder?folder_id=322503

Of course, you could go the proper RF Forum route and get both! 🙂 Here's a 15mm shot:
 
Nice thread so far.

I've recently picked up a Sigma 15-30 zoom for my DReb, which is only a 24mm equiv but I also picked up a film body to take advantage of this. 15mm is quite something to get used to... I've shot 7 rolls in Hawaii, mostly @ 15mm and looking at some scenes now, I probably should have zoomed out a bit.

I'm going to try shooting the same scenes in 15, 20 & 30(or 28) just to get a better feel for this.
 
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