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08-31-2012, 10:28 AM   #781
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QuoteOriginally posted by eddie1960 Quote
essentially this looks to be a telescope type design, 2-2500 would be in the right zone for that given a telescope of this type would be about half that price but simpler to build with no af or electronics to concern you

I think you are too optimistic regarding price. The front element is still going to be expensive. I'll be pleasantly surprised at anything below $4000....

08-31-2012, 03:08 PM   #782
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QuoteOriginally posted by Pål Jensen Quote
I think you are too optimistic regarding price. The front element is still going to be expensive. I'll be pleasantly surprised at anything below $4000....
That would be a no-go, at least for me. It`s too much in the price-range of the sigma 500mm F4.5. I`ll rather spend some more for allmost an extra stop more light than 60mm longer FL and WR. The sigma EX series is also not afraid of rain.

I think it would be a mistake to put the DA560 so close to the 500 F4.5
08-31-2012, 04:19 PM   #783
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Most of the sigma EX line is not weather resistant..
08-31-2012, 11:52 PM   #784
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QuoteOriginally posted by dane.dawg Quote
Most of the sigma EX line is not weather resistant..
I didn`t said the EX series is WR...

09-01-2012, 01:52 AM   #785
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QuoteOriginally posted by Pål Jensen Quote
I think you are too optimistic regarding price. The front element is still going to be expensive. I'll be pleasantly surprised at anything below $4000....
Compare it with a 300/4. 75mm vs. 100 -- that is certainly not 4x more .
09-01-2012, 02:39 AM   #786
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In my blog, you find a formula how lens price scales with front lens element diameter. Derived from empirical data.

It is in http://falklumo.blogspot.de/2011/04/hypothetical-pentax-dfa-500mm-f56-edif.html

and the formula is

Price [MSRP in USD] = D[mm]^3.26 /1177 (typical error is +/- 25%, street price shouldn't be higher)
D is the diameter = focal length / f-stop number.

However, this formula is for highly corrected 10+ element lenses, not the expected fairly low complexity 560/5.6 with D=100. BTW, the formula yields 2800 USD. I expect the lens to come out cheaper though, around 2400 USD with 500 USD error margin. But this was before recent insane price hikes from various Japanese vendors.

Last edited by falconeye; 09-01-2012 at 02:48 AM.
09-01-2012, 02:56 AM   #787
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QuoteOriginally posted by TenZ.NL Quote
I didn`t said the EX series is WR...
Well you did or can you explain what the differnce is between what you said and WR
QuoteOriginally posted by TenZ.NL Quote
The sigma EX series is also not afraid of rain.
WR means the lenses arent Weather Proof just Resistance so more then normal lenses would, and you say the EX is not afraid for the rain ALSO so it seems you mean they are also WR.
09-01-2012, 03:05 AM   #788
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QuoteOriginally posted by falconeye Quote
In my blog, you find a formula how lens price scales with front lens element diameter. Derived from empirical data.

It is in Falk Lumo: A hypothetical Pentax DFA* 500mm F5.6 ED(IF) SDMii

and the formula is

Price [MSRP in USD] = D[mm]^3.26 /1177 (typical error is +/- 25%, street price shouldn't be higher)
D is the diameter = focal length / f-stop number.

However, this formula is for highly corrected 10+ element lenses, not the expected fairly low complexity 560/5.6 with D=100. BTW, the formula yields 2800 USD. I expect the lens to come out cheaper though, around 2400 USD with 500 USD error margin. But this was before recent insane price hikes from various Japanese vendors.
That also happens to be within what the more concrete rumours say.
It also makes sense for the system.

09-01-2012, 04:31 AM   #789
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QuoteOriginally posted by falconeye Quote
In my blog, you find a formula how lens price scales with front lens element diameter. Derived from empirical data.

It is in Falk Lumo: A hypothetical Pentax DFA* 500mm F5.6 ED(IF) SDMii

and the formula is

Price [MSRP in USD] = D[mm]^3.26 /1177 (typical error is +/- 25%, street price shouldn't be higher)
D is the diameter = focal length / f-stop number.

However, this formula is for highly corrected 10+ element lenses, not the expected fairly low complexity 560/5.6 with D=100. BTW, the formula yields 2800 USD. I expect the lens to come out cheaper though, around 2400 USD with 500 USD error margin. But this was before recent insane price hikes from various Japanese vendors.
Well this lens should be 1.999 euro to get any ground and attrackt new users for birding and stuff to the Pentax brand. No idea if this is possible. Sony's 500mm/f4 costs 12.999 euro overhere and I don't think they sell more then a handfull of them in The Netherlands. It has to outperform the sigma longzooms in IQ, but it also has to compete with these lenses in the wallets from hobbyphotographers.
09-01-2012, 05:03 AM   #790
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QuoteOriginally posted by RonHendriks1966 Quote
Sony's 500mm/f4 ... has to outperform the sigma longzooms in IQ
It is then sad of course (for Sony) that a recent magazine test (Colorfoto?) tested the Sony 500 far behind the Sigma 500 (in IQ). I have some reservations with their testing methodology (e.g., cross system comparisons), but the results have been too clear to be ignored. It would be sad if the Sony 500 would at the same time be the most expensive AND the worst performing 500 offer. Anyway, it made me curious enough to watch the topic ...
09-01-2012, 07:54 AM   #791
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QuoteOriginally posted by falconeye Quote
It is then sad of course (for Sony) that a recent magazine test (Colorfoto?) tested the Sony 500 far behind the Sigma 500 (in IQ). I have some reservations with their testing methodology (e.g., cross system comparisons), but the results have been too clear to be ignored. It would be sad if the Sony 500 would at the same time be the most expensive AND the worst performing 500 offer. Anyway, it made me curious enough to watch the topic ...
Could have been a bad sample. Not that this should happen at this price class, but it does.
09-01-2012, 11:14 AM   #792
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QuoteOriginally posted by LamyTax Quote
Could have been a bad sample. Not that this should happen at this price class, but it does.
Frankly, at that price it should be manually tested for optical QC (and mechanical QC too of course).
It's a Leica price with a Lomo glass
09-01-2012, 11:20 AM   #793
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QuoteOriginally posted by falconeye Quote
However, this formula is for highly corrected 10+ element lenses, not the expected fairly low complexity 560/5.6 with D=100. BTW, the formula yields 2800 USD.
Do you know any lens from the camera manufacturers (as oposed to third party vendors) with such a large front element that cost only $2800?
09-01-2012, 12:22 PM   #794
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QuoteOriginally posted by Anvh Quote
Well you did or can you explain what the differnce is between what you said and WR


WR means the lenses arent Weather Proof just Resistance so more then normal lenses would, and you say the EX is not afraid for the rain ALSO so it seems you mean they are also WR.
Stefan, (edited by moderator) don't put words in my mouth... (edited by moderator)
I`m well aware of the difference between weather resistance or weather/waterproof. You live in Holland and unless you don`t ever go out, you must know that rain comes in all kinds of levels.
WR is for all, the EX I thrust upto a certain level and that`s way more than your average consumerclass lenses. Especially when it has internal focus.

Last edited by Blue; 09-27-2012 at 04:04 PM. Reason: inflammatory
09-01-2012, 02:41 PM   #795
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