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Voigtländer Nokton 25/0.95
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PostPosted: Sun Dec 12, 2010 8:59 pm    Post subject: Voigtländer Nokton 25/0.95 Reply with quote

I got this lens three weeks ago, but I have been too busy with my work to use it much. Anyway, here are a few pictures taken during the last few days, all taken wide open at F/0.95:















Obviously, vignetting is very high wide open:















Like many fast lenses, some aberrations are quite visible wide open (mainly lateral and longitudinal chromatic aberrations, as well as coma). As stated before, vignetting is also pretty bad (around 2 stops in the corners). Lastly, there is a nasty field curvature that prevents the corners from being sharp at the same time as the center of the field.

So, does it mean that the lens is useless? Certainly not. It remains perfectly usable wide open -- even though the images are not perfect -- and not only for close up shots, but also for images taken at infinity in poor light conditions. And when stopped down, the lens becomes very sharp and free from aberrations.

Of course, built quality is top level, as usual with Cosina/Voigtländer products, while the price, although a bit expensive, is in fact quite reasonable for the quality of this lens, especially when compared to other super fast lenses. If you really need F/0.95, you know what I mean!

Cheers!

Abbazz


PostPosted: Sun Dec 12, 2010 9:24 pm    Post subject: Reply with quote

Looks interesting, quite swirly bokeh. I assume you're not in Brunei aymore - this doesn't look like a typical Brunei landscape Wink


PostPosted: Sun Dec 12, 2010 9:25 pm    Post subject: Reply with quote

Image seems to be very soft in the extreme corners. Except for the corners, the image quality seems to be pretty impressive!


PostPosted: Sun Dec 12, 2010 9:32 pm    Post subject: Reply with quote

Omar wrote:
I love the clairty in the pictures, even though the weather is not ideal it performs! Could you post a picture of the lens itself?

Here's the lens:


Picture Credit: CameraQuest

And the optical formula (11 elements in 8 groups):


Picture Credit: CameraQuest

Orio wrote:
Looks interesting, quite swirly bokeh. I assume you're not in Brunei aymore - this doesn't look like a typical Brunei landscape Wink

No more Brunei, Orio, I am back to France for a few years... That's why I need fast lenses for the dark European Winters!

Cheers!

Abbazz


PostPosted: Sun Dec 12, 2010 10:11 pm    Post subject: Reply with quote

Nice results, Abbaz and welcome back to France, even if it's not the best time to come back as weather is not very good... Wink

Where have these shots been taken ?
Northern France, or Western like around Le Mans ?


PostPosted: Sun Dec 12, 2010 10:17 pm    Post subject: Reply with quote

Abbazz wrote:
Omar wrote:
I love the clairty in the pictures, even though the weather is not ideal it performs! Could you post a picture of the lens itself?

Here's the lens:


Picture Credit: CameraQuest

And the optical formula (11 elements in 8 groups):


Picture Credit: CameraQuest

Orio wrote:
Looks interesting, quite swirly bokeh. I assume you're not in Brunei aymore - this doesn't look like a typical Brunei landscape Wink

No more Brunei, Orio, I am back to France for a few years... That's why I need fast lenses for the dark European Winters!

Cheers!

Abbazz


Seems amazingly sharp wide open for such a fast lens!...I would like to know what mount it has? ...And does it have a short registration distance making it suitable for use on 4/3rds DSLR's or rangefinders or can it be used at infinity on most DSLR's??


PostPosted: Sun Dec 12, 2010 10:35 pm    Post subject: Reply with quote

I'm seriously impressed! For such a fast lens, the results are excellent. Great photos!


PostPosted: Sun Dec 12, 2010 10:38 pm    Post subject: Reply with quote

I think it's a m4/3 lens (but MF only, no cpu).


PostPosted: Mon Dec 13, 2010 12:12 am    Post subject: Reply with quote

Wow! I'm amazed by this lens. Looks like another one for my dream list! Wink


PostPosted: Mon Dec 13, 2010 12:18 am    Post subject: Reply with quote

Hey nice to see your post again! I am very impressed about image quality, many thanks for sharing them!


PostPosted: Mon Dec 13, 2010 12:39 am    Post subject: Reply with quote

Very surprising results Abbazz. Much better than I would have expected - usually those ultra-fast lenses give up a lot more sharpness wide open. Amazing.


patrickh


PostPosted: Mon Dec 13, 2010 12:40 am    Post subject: Reply with quote

I agree, it's really good to be wide open Very Happy


PostPosted: Mon Dec 13, 2010 6:48 am    Post subject: Reply with quote

Thanks guys for the kind words. I have been surprised by the image quality delivered by this lens, as there have been many negative comments on some photography forums dedicated to beginners. But, as usual, those were from professional pixel peepers who have never seen the lens.

Of course, as this is a native Micro 4/3rds lens, it is not usable on any larger format camera, except maybe for some high magnification macro shots.

Olivier wrote:
Nice results, Abbaz and welcome back to France, even if it's not the best time to come back as weather is not very good... Wink

Where have these shots been taken ?
Northern France, or Western like around Le Mans ?

The weather is spectacularly bad in fact! I don't mind freezing cold temperatures but I have problems with cold and damp climate!

These pictures have been taken near my new home in Vendôme, Central France, not far from the Loire Valley.

Cheers!

Abbazz


PostPosted: Mon Dec 13, 2010 8:43 am    Post subject: Reply with quote

Abbazz wrote:
These pictures have been taken near my new home in Vendôme, Central France, not far from the Loire Valley.
Cheers!
Abbazz

That's great !
Maybe we'll admire some nice castle photographies in the next months ? Smile


PostPosted: Mon Dec 13, 2010 10:00 pm    Post subject: Reply with quote

very jealous. That lens kicks ass for 0.95 wide open sharpness and detail. You got a real gem


PostPosted: Tue Dec 14, 2010 5:23 pm    Post subject: Reply with quote

It indeed gives very nice results. Nice catch! Fortunately, I have no m4/3 camera, so I can't be jealous. Evil or Very Mad

Food for thought: According to the DOF INDEX (divide focal length by aperture -- larger quotients mean thinner DOF) the DOF of a 25/0.95 is thicker than a 50/2.0 but thinner than a 50/1.7. But if I could get anything in the f/1.0 neighborhood, would I? Hell yeah! Stuff like this almost pushes me towards painfully buying an m4/3 cam. But then I would be jealous... Embarassed


PostPosted: Wed Dec 15, 2010 2:04 am    Post subject: Reply with quote

My copy of this lens should be arriving soon, and I should be receiving the Angenieux 25/0.95 I bought from Attila's friend too, so I'll do some comparison shots Smile


PostPosted: Wed Dec 15, 2010 10:39 am    Post subject: Reply with quote

rawhead wrote:
My copy of this lens should be arriving soon, and I should be receiving the Angenieux 25/0.95 I bought from Attila's friend too, so I'll do some comparison shots Smile


Great! Wink


PostPosted: Wed Dec 15, 2010 11:55 am    Post subject: Reply with quote

RioRico wrote:

Food for thought: According to the DOF INDEX (divide focal length by aperture -- larger quotients mean thinner DOF) ...


The DOF INDEX, as you describe it, is simply the physical size of the aperture (or, if you prefer, the entrance pupil). Most treatments of Depth of Field eliminate it and use a combination of focal length and aperture number. However you can use it - if you want to. Wikipedia (not infallible I know, but it's probably OK here)

http://en.wikipedia.org/wiki/Depth_of_field#Derivation_of_the_DOF_formulas

gives an example where it says ...

....the DOFs are in inverse proportion to the absolute aperture diameters which is in accord with your DOF INDEX ideas. However it is describing a situation where two different camera formats are being compared With the same subject distance and angle of view for both formats.


PostPosted: Wed Dec 15, 2010 12:17 pm    Post subject: Reply with quote

When I first read about it, I thought: "What is that good for?"
I expected an "reputation" lens with an aperture of f/0.95 that is of no real use.
But this lens looks good! It is a beauty and it seems to be a fantastic performer. Such a lens is great for all µ4/3 users. I really have changed my mind.
If I ever will a GF2, I will also get this lens!


PostPosted: Wed Dec 15, 2010 4:19 pm    Post subject: Reply with quote

Looks very sharp wide open. Love the first pic. Must be quite pricey!


PostPosted: Wed Dec 15, 2010 5:50 pm    Post subject: Reply with quote

sichko wrote:
RioRico wrote:

Food for thought: According to the DOF INDEX (divide focal length by aperture -- larger quotients mean thinner DOF) ...

The DOF INDEX, as you describe it, is simply the physical size of the aperture (or, if you prefer, the entrance pupil).

You are correct, I mis-described it. The DOF INDEX is the focal length divided by the f-number, not by the aperture diameter. I used sloppy language.

Where N is f-number, F is focal length, D is aperture diameter (entrance pupil), and I is DOF index:

N= F/D
I= F/N or I= F/(F/D)

I understand (fuzzily) that DOF is a non-trivial function of photography, presentation, and perception. Lens selection, frame size, and subject distance, are under the direct control of the photographer; presentation and perception are not.

Assuming that ALL ELSE are held constant, the independent variables are the lens characteristics: focal length and aperture, especially a maximum aperture. As suggested by a member here, I use those to simply compute a comparative index -- a lens with a higher F/N ratio will have thinner DOF than a lens with a lower F/N ratio, and different lenses with similar F/N ratios should have similar DOF. This index is for rough comparison of lenses, not for nailing down the DOF of any specific lens in any specific situation.


PostPosted: Sat Dec 25, 2010 10:33 pm    Post subject: Nokton 25/0.95: excellent! Reply with quote

Got this lens just in time for the Xmas holidays, and I am very positively impressed and delighted. On Lumix G1 and GH2, for portrait pictures at available light (house), it is excellent. The extra luminosity is a bonus, focussing is very easy, sharpness is excellent (if you focus well), contrast is excellent. And - it is FUN to use! I have used a lot of older lenses (Leica and Beroflex 28/2.8, Leica 40/2, Takumars 50/1.4, 55/1.8, Voigtlaender 75/2,...) but this one is the definite keeper. it is pricey (800 CHF = 800 USD here in Switzerland over the internet) but it is definitely worth it! it is a bit heavy (metal and muchglass) but well in the hand. The bokeh is not "soft as butter" but is still pleasant, and a nice surprise is the close focus capability (17cm) that makes for interesting perspectives.


PostPosted: Mon Dec 27, 2010 1:23 am    Post subject: Reply with quote

Do you find this lens helps you feel a bit better about the high ISO limitations of the m43 cameras? .95 would be very useful in keeping the ISO down, it seems to me.


PostPosted: Tue Dec 28, 2010 10:55 am    Post subject: Reply with quote

Very sharp wo. The bokeh seems buzzy, and, perhaps, not in a pleasant way. Thx for sharing.