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02-26-2019, 12:49 AM   #31
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That custom KP looks awesome. Looking forward hearing more about it.

02-26-2019, 01:07 AM   #32
sbh
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The prism housing looks good...
02-26-2019, 01:25 AM - 1 Like   #33
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QuoteOriginally posted by biz-engineer Quote
Petal style is better optically,
The petal-style hood design is only better with respect to a given size/weight.

One could make the current hood slightly larger by adding the petal-shaped bits and that would help a bit, but it would also mean that the hood becomes larger/heavier (and less useful to place the lens/camera combo on).
Alternatively, they could have made a larger round hood and also improved on the current one, without using petal-shaped bits; it would have just be a little bit heavier than the optimal petal-shaped design.

It's just a size/weight matter, not one of "better optically".

Looking forward to seeing first shots from this lens. An unknown market launch date does not suggest it will be any time soon, though.
02-26-2019, 02:05 AM   #34
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and oldie and a remake


hoerah for the non fantasie of 100 years pentax

02-26-2019, 02:22 AM   #35
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QuoteOriginally posted by ebk Quote
and oldie and a remake


hoerah for the non fantasie of 100 years pentax
Glad that someone said it out loud . New modelled KP is oldie little remade. But might give us a idea of how handle will evolve in future.
02-26-2019, 02:35 AM   #36
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QuoteOriginally posted by Class A Quote
The petal-style hood design is only better with respect to a given size/weight.
My understanding is that circular hood has to be wide enough so that it doesn't create vignetting for the long side of the 3:2 rectangle, and the circular shape is therefore too wide to equally protect the short side of the image rectangle. So, if my understanding is correct, the petal shaped hood provides better optical protection vs the circular one. Where is my thinking faulty?

Last edited by biz-engineer; 02-26-2019 at 02:41 AM.
02-26-2019, 02:35 AM   #37
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QuoteOriginally posted by Thagomizer Quote
I think this pattern of three circular openings is a decorative motif. It appeared in more places on the original posting of this custom design KP
Aha. Could be just decoration or grip improvement. Also looks like stereo speaker openings (?).
02-26-2019, 02:45 AM   #38
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is the news on the *85 that they are showing a mock-up but probably delaying the launch?

The road map is for 2019, now market launch is 'undecided'?

02-26-2019, 02:50 AM   #39
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Looking forward to the DFA* 85mmf1.4. Will be my next purchase. I'm very happy with Pentax-D FA* 50mm f1.4. I truly hope that 85mm f1.4 will reach the same level, and it can replace the old Pentax-A 85mm f1.4 in my camera bag.
02-26-2019, 02:54 AM - 1 Like   #40
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QuoteOriginally posted by biz-engineer Quote
My understanding is that circular hood has to be wide enough so that it doesn't create vignetting for the long side of the 3:2 rectangle, and the circular shape is therefore too wide to equally protect the short side of the image rectangle. So, if my understanding is correct, the petal shaped hood provides better optical protection vs the circular one. Where is my thinking faulty?
Petal hoods seem to be favoured on wider angle lenses.

02-26-2019, 03:10 AM - 2 Likes   #41
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QuoteOriginally posted by clackers Quote
Petal hoods seem to be favoured on wider angle lenses.
Yes, I noticed the same thing. I guess wide angle lenses are more sensitive to flare, a lesser issue with 85mm... except some people like LeRolls to shoot top models with an 85mm against the sun.
On super tele lenses, the big hood makes it bigger, looking more like a 600 f4 when you only have the money for the 150-600
02-26-2019, 03:29 AM - 1 Like   #42
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QuoteOriginally posted by biz-engineer Quote
Yes, I noticed the same thing. I guess wide angle lenses are more sensitive to flare, a lesser issue with 85mm...
Yeah, I think it's more a vignetting issue.

In a very wide angle lens, the front element is huge - it can even bulge outwards.

A petal hood is just letting in a bit more light in the four corners, of course making it more vulnerable to flare there.

02-26-2019, 03:42 AM - 1 Like   #43
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I would see it like this: in a tele lens the petals of the hood could be enormously long. If you make the hood exactly that long that you don't need to cut out the corners it can stay round. It is not the maximum possible length but flare and straylight are a lesser problem anyway and one main purpose is to avoid e.g. direct sunlight on the front element.
02-26-2019, 04:46 AM   #44
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Wonder if Tokina will partner up on this 85mm with Pentax?
02-26-2019, 04:51 AM   #45
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That would be wise for both but it takes two to tango...
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