[Irix Lens] Irix 15mm f2.4 un UGA disponible en monture Pentax !!!

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Re: [Irix Lens] Irix 15mm f2.4 un UGA disponible en monture Pentax !!!

Message par Mistral75 le Ven 12 Mai 2017, 12:56

Essai de l'Irix 15 mm f/2,4 en version Firefly monté sur un Canon EOS 5Ds R par Mark Goldstein pour PhotographyBLOG :

Irix 15mm f/2.4 Review | PhotographyBLOG (5 pages)

Mark Goldstein pour PhotographyBLOG a écrit:The Irix 15mm f/2.4 is an excellent super-wide-angle prime lens that delivers very good image quality. Sharpness in the centre of the frame is excellent throughout the aperture range, even wide open at f/2.4, with f/4-f/11 producing the best results. The edges of the frame aren't quite as sharp, but still very good.

The Irix 15mm f/2.4 is a pleasure to use, thanks to its superb build quality, smooth focus ring and hyperfocal scale. As this is a manual-focus only lens, you'd expect this aspect of the operation to be intuitive, and so it proved. Together with the Canon EOS 5DS R's Manual Focus Assist feature in Live View mode and the confirmation beep when using the optical viewfinder, the Irix 15mm f/2.4 delivered a high percentage of keepers, despite the shallow depth of field when shooting wide open. The 25cm minimum focusing distance also makes the lens versatile enough to shoot close subjects.

There are a couple of minor drawbacks to the Irix 15mm f/2.4. Vignetting is obvious wide-open at f/2.4 and still fairly evident at f/5.6, although in real-world use it's less of a problem than when photographing a white wall/test-chart. Secondly, the 95mm front filter size is pretty expensive, although certainly better than no filter system at all, and you can alternatively choose to fit rear gelatin filters.

The full retail price of £399 / $400 for the standard Firefly version that we tested seems very reasonable for such a wide-angle lens, especially given the overall build and optical quality. If you want an even sturdier lens with useful engraved fluorescent markings and a better case, then the Irix 15mm f/2.4 Blackstone costs another £200 / $200, although as both lenses have the same optical and mechanical construction, we'd probably choose the cheaper option.


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Re: [Irix Lens] Irix 15mm f2.4 un UGA disponible en monture Pentax !!!

Message par Roussinix le Ven 12 Mai 2017, 14:10

Il n'en parle pas, mais il y a du vignetage Wink


K10D + K20D grippé + KatzEye(s) + Pentax Q + DxO + 1 soufflet K, 3 soufflets M42 et quelques bagues d'adaptation
Objectifs : Carl ZEISS Distagon T* 28mm f/2 - Voigtländer Nokton 58mm f/1.4 - Chinon (4 M42) - Takumar 100mm f/4 Bellows - Autres M42
Pentax Auto110 Collection quasi complète Auto110 et Auto110 Super
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Re: [Irix Lens] Irix 15mm f2.4 un UGA disponible en monture Pentax !!!

Message par Mistral75 le Ven 12 Mai 2017, 14:16

@Roussinix a écrit:Il n'en parle pas, mais il y a du vignetage Wink

Si, il en parle :

Mark Goldstein pour PhotographyBLOG a écrit:Light fall-off is noticeable wide open at f/2.4, though this is to be expected for such a wide-angle lens and can easily be corrected in Photoshop. Stop down to f/5.6 and the vignetting is already less prominent, but it is still visible when shooting pale scenes that fill the frame.
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Re: [Irix Lens] Irix 15mm f2.4 un UGA disponible en monture Pentax !!!

Message par Roussinix le Ven 12 Mai 2017, 14:23

Ça m'avais échappé Very Happy


K10D + K20D grippé + KatzEye(s) + Pentax Q + DxO + 1 soufflet K, 3 soufflets M42 et quelques bagues d'adaptation
Objectifs : Carl ZEISS Distagon T* 28mm f/2 - Voigtländer Nokton 58mm f/1.4 - Chinon (4 M42) - Takumar 100mm f/4 Bellows - Autres M42
Pentax Auto110 Collection quasi complète Auto110 et Auto110 Super
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Re: [Irix Lens] Irix 15mm f2.4 un UGA disponible en monture Pentax !!!

Message par Mistral75 le Jeu 25 Mai 2017, 12:05

TH Swiss AG a mis en ligne une nouvelle version du profil de correction de l'Irix 15 mm f/2,4 (et du 11 mm f/4) pour Adobe Lightroom et Camera Raw.

Irix - The new lens profiles for Irix 11mm and 15mm

TH Swiss a écrit:TH Swiss company, listening to the requests and inqueries from their customers, officially announces the availability of the updated correction profiles for Irix 11mm and 15mm lenses to use with Adobe Photoshop Lightroom software.

The update concerns the improvement of the correction data for distortion and vignetting. Moreover, the way of displaying the profiles inside of Adobe program has changed. Earlier versions of the profiles required finding Irix lenses in camera's manufacturer tab, while in current version you can find both models of Irix lenses listed in dedicated tab called „Irix”. The profiles package for both lenses is now ready to download from the website irixlens.com on subpage: Updates → Downloads → Others.

Especially for Irix lenses users, TH Swiss prepared two video tutorials to explain how to install and use Irix profiles on Windows and Mac Computers. These video tutorials can be found at Irix YouTube account: www.youtube.com/irixlens

Lien direct de téléchargement : http://fr.irixlens.com/public/uploads/downloads/others/Irix_11mm_15mm_lens_profiles_20170520.zip
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Re: [Irix Lens] Irix 15mm f2.4 un UGA disponible en monture Pentax !!!

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