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02-22-2013, 01:43 PM   #31
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I would believe that the last 67 90mm f/2.8 (non LS version) is not at that stage away from the new HD D-FA645, optically speaking.

02-23-2013, 12:41 AM   #32
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I don't have the non LS version of the 6x7 90mm. But so far, all fast 6x7 lenses I tried on the 645D, were requireing stopping down to f/5.6 at least, quite often even to f/8, to be sharp to the borders in case of objects that are quite far away (i.e. landscape). I tried these: 90/2.8 LS, 105/2.4, 150/2.8 and 165/2.8.
It is well possible new lenses are better wide open. For example, the 55 SDM 645 is better wide open than the old f/2.4 and f/2.8 6x7 lenses I have. I don't know about bokeh, as I am not using the 645D for people photography. This kin of photography, I am covering with the Nikon D3. I don't need 40 MP pictures of a face, 12 MP is more than enough. An the D3 AF is quick enough to follow my children running around.
02-23-2013, 02:38 AM   #33
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QuoteOriginally posted by donesteban Quote
I don't know about bokeh, as I am not using the 645D for people photography. This kin of photography, I am covering with the Nikon D3. I don't need 40 MP pictures of a face, 12 MP is more than enough. An the D3 AF is quick enough to follow my children running around.
In this case I can confirm you that this new 90mm lens is not made for you and your kind of photography. You would pay a lot of money for features you don't need... (but: bokeh and wide open shots can be very attractive even in landscape photography)

I use it for landscape and architecture as well but the real pleasure is to using it handheld and wide open
02-23-2013, 08:24 PM   #34
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hi Ristretto.. can you post a portrait with the new 90 lens?

02-24-2013, 07:55 AM   #35
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the colors are so amazing~
02-24-2013, 08:41 AM   #36
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QuoteOriginally posted by hoq Quote
the colors are so amazing~
That's Lightroom, not the lens, I suppose...
02-24-2013, 09:06 AM   #37
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QuoteOriginally posted by acarlay Quote
hi Ristretto.. can you post a portrait with the new 90 lens?
I had to ask first...

All shots with aperture 2.8.
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02-24-2013, 04:55 PM   #38
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A look at the cross section of this lens shows that it is quite a departure in design from other Pentax lenses in this focal length. As an example, the 90mm Takumar(LS), 90 Pentax, 105mm , 150 Takumar and 100 Macro for the 6x7 were all Double Gauss designs. This new 90 is not. It uses 11 elements, with two being ED and one aspherical. It looks to be a unique design.

02-24-2013, 08:43 PM   #39
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QuoteOriginally posted by Ristretto Quote
I had to ask first...

All shots with aperture 2.8.
Wow ! Appears to be an amazing lens.
02-26-2013, 12:04 PM   #40
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Looks to be front focusing a bit, have you done a focus calibration yet?
02-26-2013, 01:39 PM   #41
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QuoteOriginally posted by atlnq9 Quote
Looks to be front focusing a bit, have you done a focus calibration yet?
No, I didn't. Where do you see front-focussing? In the minstrels photo?

In fact, the combination of a big MF-40MP sensor with an aperture 2.8 and handheld makes focusing a little bit challenging. Don't forget, the few AF-points of the 645D are all placed in the middle (more or less). If you want to focus on something (or somebody) at the edge of the frame, you have to deviate the camera which normally causes some focus-shifting. There is a reason why Hasselblad makes a lot of publicity with its focus-shifting-technology.
02-26-2013, 05:24 PM   #42
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QuoteOriginally posted by Ristretto Quote
I had to ask first...

All shots with aperture 2.8.
Looks like aberration is very well controlled!
02-27-2013, 09:46 AM   #43
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QuoteOriginally posted by Ristretto Quote
No, I didn't. Where do you see front-focussing? In the minstrels photo?

In fact, the combination of a big MF-40MP sensor with an aperture 2.8 and handheld makes focusing a little bit challenging. Don't forget, the few AF-points of the 645D are all placed in the middle (more or less). If you want to focus on something (or somebody) at the edge of the frame, you have to deviate the camera which normally causes some focus-shifting. There is a reason why Hasselblad makes a lot of publicity with its focus-shifting-technology.
That is the picture it looks most prominent in. Would be easier to tell in macro images. Not much though, as you say could be the focus shifting. I don't ever really have an issue with it as I am never shooting wide open. But I have tried my 150mm at 2.8 just for kicks and found getting focus too difficult.
02-28-2013, 12:15 AM   #44
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Hi, is there any chance I could get a file to play around with in Lightroom? Maybe the shot of the guy sitting... I'm curious about how it responds to editing in Lightroom with my PP style...
03-02-2013, 06:59 PM   #45
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Thanks for posting, this lens is capable of producing stunning results. D*mn. Perfect combination with the 67 55mm and the A 35mm.
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