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02-08-2012, 10:45 AM   #136
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My unscientific calculation (resized the image to match the barrel size at the mount of one of my lenses, put up to screen and moved it along the image) I got somewhere around 22 -24"

And the hood appears to be collapsed in this picture so add another 6" or so.

02-08-2012, 10:59 AM   #137
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The switch on the side. Could it be a focus range limiter?
02-08-2012, 11:02 AM   #138
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QuoteOriginally posted by ElJamoquio Quote
Hmmm... I think the DA*300 is larger than that. It's what, almost 8"? I don't think there's any way this 560 is, say, 22", like your picture seems to indicate.
K500/4.5 was 440mm or 17.32 inches.

I dunno, 560/5.6 could be 22" - 24"
02-08-2012, 11:21 AM   #139
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the old canon EF600 4.5 was only 18 inches and looks similar in size (the 800 5.6 was also 18" or so). so 22-24 inches may be a little long. probably about 18" at the max maybe a little more if the built in hood is long



02-08-2012, 11:25 AM   #140
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QuoteOriginally posted by LFLee Quote
Somehow I think the DA 560mm will be around $1499-$1699....
a) I don't think Pentax is prepared to "sell a million of them" ... which they'd likely end-up doing @ that price.
b) Sure there's a million ways to skin a cat, but I'll still say the lens requirements to achieve a 560mm f/5.6 is not far off from what it is to make a 300mm f/2.8 (or maybe f/3.2), then integrate the 2X TC components to it (with the ability to remove some lens elements from the whole). I assume you know where those are priced, even assuming only needing to project to the somewhat smaller cropped image circle.

I just don't see that price-point being possible.

Last edited by m8o; 02-08-2012 at 11:31 AM.
02-08-2012, 11:45 AM   #141
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QuoteOriginally posted by monochrome Quote
K500/4.5 was 440mm or 17.32 inches.

I dunno, 560/5.6 could be 22" - 24"
It is difficult from the pictures to see the mount clearly which is a fixed known size. Using simple photogrammetry, the length looks like between 18 and 20 inches.
02-08-2012, 11:49 AM   #142
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Several lenses for compare. I think length of 560 about 24-25 inches.

PENTAX-DA★ 300mm F4 ED [IF] SDM
PENTAX-FA★ 300mm F2.8 ED [IF]
PENTAX-FA★ 600mm F4 ED [IF]
PENTAX-DA★ 560mm F5.6 ED [IF] ?


Last edited by kindakaa; 02-08-2012 at 11:58 AM.
02-08-2012, 12:05 PM   #143
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Why does it end up longer than an FA*600mm f/4 with a shorter FL and smaller aperture?

PENTAX-DA★ 560mm F5.6 ED [IF]

That ★ doesn't belong there. If you look at the photos of the lens on the Pentax site, there's no star, just DA.


Last edited by audiobomber; 02-08-2012 at 12:47 PM.
02-08-2012, 12:10 PM   #144
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QuoteOriginally posted by kindakaa Quote
Several lenses for compare. I think length of 560 about 24-25 inches.
What part of each lens did you use to compare them at the same scale?
02-08-2012, 12:12 PM   #145
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QuoteOriginally posted by audiobomber Quote
Why does it end up longer than an FA*600mm f/4 with a shorter FL and larger aperture?

PENTAX-DA★ 560mm F5.6 ED [IF]

That ★ doesn't belong there. If you look at the photos of the lens on the Pentax site, there's no star, just DA.
I hope it was a computer model, and not the real picture and will be ★
02-08-2012, 12:14 PM   #146
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QuoteOriginally posted by demp10 Quote
What part of each lens did you use to compare them at the same scale?
I tried to use bayonet size
02-08-2012, 12:22 PM   #147
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QuoteOriginally posted by demp10 Quote
It is difficult from the pictures to see the mount clearly which is a fixed known size. Using simple photogrammetry, the length looks like between 18 and 20 inches.
TYVM! Like I said, I dunno.
02-08-2012, 12:27 PM   #148
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This looks close and puts it at about 20" without hood extension.
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02-08-2012, 12:30 PM   #149
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I compare again.
More carefully. I think - now has a more accurate value.
560 length with hood equal to exactly two lengths of DA 300mm F4.0

02-08-2012, 12:35 PM   #150
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Geez guys, stop moaning. An affordable long tele is good news for Pentax users.
If they go out right now with a 300/2.8, it wouldn't sell (but forums, I know).

They need to build momentum, and that's what Ricoh does. If I ever buy such a lens, it will be a DA, not a DA*. No way I could afford a DA* Tele.
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