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 on: Today at 04:30:02 AM 
Started by Alex Waugh - Last post by BartvanderWolf
It should be fun because that is real 6x6 MF size, the look should be un-surpassed! Wink

LOL, that should set them wannabee (cropped) 'MF' sensor boys straight...

Shooting true MF@56x56mm (or 56x70mm) with Portra 160 should be fun (I think I still have some '120 spool' rolls in the fridge), just give it a bit more exposure for better scans. Shooting it as ISO 160 gives rather modest density, more density is better for scanning. I used to shoot it as ISO 125 even when I did C-prints, but scans have no problem with even lower ISO ratings and normal processing.


P.S. I've added some common filmscan sizes to the camera pull down menu of my on-line DOF and Focusstacking tool. Resolution on filmscans is not as clear cut as for a direct digital capture device, so I have not included scan resolutions that are only needed to avoid grain-aliasing or artificial upsampling.

 on: Today at 04:26:39 AM 
Started by synn - Last post by RomanN.
I my practical use the old Af 3,5/150 mm is a very sharp lens and used at f/8- f/16 cannot be better. I tested it against the AF 120 mm Macro that should be the sharpest mamiya lens and cant see any differances at portrait use ( used with Leaf 12). The new 2,8/150 mm is a dream lens and will be better at 2,8- 5,6 but not at parctical use at f8-16. The 2,8 have better close distance: 1 meter where the 3,5 ave 1,5. So for faces macroring must be used. But for this cheap price the 3,5/150 mm is a best deal- where the 2,8 ofcourse is superior.
When your 150 is not sharp you should try another copy. My 3,5/150 is also much, much sharper that the old non-AF A 2,8/150 mm.

 on: Today at 04:20:23 AM 
Started by Harlem22 - Last post by Damon Lynch
"Gender" has nothing whatever to do with the biological basis of sex in mammals, Damon. It has only to do with grammar in inflected languages. If WHO wants a word to distinguish between sex and sexual roles, let it come up with a new one instead of debasing a perfectly good and useful word.

Russ, gender is not the same as biological sex, correct. You are welcome to make your argument that gender is purely about language if you like. You may even be able to rustle up an obscure scholar or two who agrees with you. But meanwhile practically the entire scientific and social scientific community has a different conception than the one you believe in. It's not very complicated. Sex refers to biological aspects, and gender to cultural aspects. That's all.

 on: Today at 04:08:03 AM 
Started by Chairman Bill - Last post by BernardLanguillier
Bernard, is this using the D810 Profile or the IQ250 Profile?

I used to use IQ250 profiles for my D800, but as of C1 Pro 8 I use the native D810 profiles for the D810.


 on: Today at 04:07:42 AM 
Started by Ellis Vener - Last post by francois
I have not made the leap, I usually wait a month or so, but Lloyd Chambers complained bitterly on his Mac Performance Guide site about slow response, opening & closing files. He urges caution. And no, I'm not related to him, nor do I work for him.

I've not [yet?] experienced any slow-downs (compared to the previous system) when opening or closing files on my Macs but I might just be lucky.

 on: Today at 04:04:07 AM 
Started by Eric Myrvaagnes - Last post by francois

Smooth lines, fantastic soft colors, it's a stunning image.

 on: Today at 04:02:54 AM 
Started by MGH - Last post by francois
Wonderful light and composition.

Agree and there's the traditional little cloud, stuck to the mountain, near the summit!

 on: Today at 03:58:48 AM 
Started by dwswager - Last post by BartvanderWolf
The entrance pupil position will also vary by changing the focusing distance

Hi Frank,

In general that's correct, which is why I tend to calibrate for specific scenario's (e.g. landscapes focused on 3 metres, longer distances will not exhibit much parallax anyway, or close-ups, or telelens/'gigapano' work).

However, also here, in particular internal focusing (lensbarrel keeps the same length) may leave the more frontal lens elements (and thus entrance pupil) relatively stationary, while shifting the rear lens elements and/or groups fore/aft.
One just needs to test for particular lens design.


 on: Today at 03:57:19 AM 
Started by atobaya - Last post by atobaya

 on: Today at 03:42:20 AM 
Started by dwswager - Last post by FranciscoDisilvestro

That would depend on the optical construction though. Zoom lenses with internal focusing and moving groups of elements may cause a displacement of the entrance pupil that is non-linear (may even oscillate). I recommend to first check (visually) by looking through the lens from the front, and judge if the entrance pupil shifts visibly/linearly when zooming in or out. It's best done by also closing the aperture a bit to better visualize the apparent entrance pupil position.


The entrance pupil position will also vary by changing the focusing distance

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