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01-18-2011, 04:47 PM   #31
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Why is it that Nikon has files patents for three long telephotos lenses and I would like any of them. Pentax has filed for a cropped Bigma, which I wouldn't want. Where is the DA*135-400 (the cropped version of the FA*250-600) or a DA*400 or DA*500 primes. I would love to buy a few more lenses but the last two DAL35 and DA18-135 are just not interesting.

Dave

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01-18-2011, 06:35 PM   #32
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I wouldn't mind seeing a DA*200-400mm F/4. Nikon has their version but it is $7,000.00. It is one good lens as it is sharp and has a strong depth of field at F/4. I do have a Sigma 500mm F/4.5 and I am beginning to really like this lens but it is not weather sealed. I'll just walk around with a plastic garbage bag in case it rains suddenly.
01-18-2011, 09:52 PM   #33
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I couldn't agree with you more. Pentax once had a nice selection of teles. If they're not installing sophisticated lens-based shake/vibration reduction systems, I can't imagine it would overly strain R&D to re-invent more old favorites with weather sealing (e.g., 100/2.8 WR macro) and SDM.

I'm not really interested in slow, variable-aperture zoom lenses. For consumer DSLRs like the Kx maybe but the K5 deserves better. I was really hoping Pentax would release a DA* variant of the Tokina 11-16/2.8. That would nicely round out the DA* short to mid-range zooms.

Thinking pessimistically, I wonder if future interesting lens offerings will emerge from Sigma and Tamron (thinking of 70-200/2.8 and forthcoming 85/1.4) rather than Pentax. Assuming of course that 3rd parties continue to manufacture new releases in a Pentax mount - which is unclear given the defection of Zeiss/Voigtlander. I hope I'm wrong.

At any rate, until the day I seriously bid on a FA 300/2.8 and 600/4, I'm happy with the excellent primes. But wouldn't it be cool if Pentax released WR versions of, say, the DA Limited line once or twice a year - is that even remotely realistic? I wonder how many folks would re-purchase a lens. I believe in the DVD market this is called "double-dipping" wherein, for example, Star Wars is re-released several times with additional extras included (director's cut, behind-the-scenes, etc.).

QuoteOriginally posted by DaveBlack Quote
Why is it that Nikon has files patents for three long telephotos lenses and I would like any of them. Pentax has filed for a cropped Bigma, which I wouldn't want. Where is the DA*135-400 (the cropped version of the FA*250-600) or a DA*400 or DA*500 primes. I would love to buy a few more lenses but the last two DAL35 and DA18-135 are just not interesting.

Dave

Dave

Last edited by MrPetkus; 01-18-2011 at 11:34 PM. Reason: Deleted comment regarding current DA* 300/4.
01-19-2011, 05:51 AM   #34
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QuoteOriginally posted by MrPetkus Quote
I couldn't agree with you more. Pentax once had a nice selection of teles. If they're not installing sophisticated lens-based shake/vibration reduction systems, I can't imagine it would overly strain R&D to re-invent more old favorites with weather sealing (e.g., 100/2.8 WR macro) and SDM.

I'm not really interested in slow, variable-aperture zoom lenses. For consumer DSLRs like the Kx maybe but the K5 deserves better. I was really hoping Pentax would release a DA* variant of the Tokina 11-16/2.8. That would nicely round out the DA* short to mid-range zooms.
I do agree that a camera like the K5 deserves better lenses that the last two lenses that they have released (DA35L and DA18-135) and the two lenses that they have patents for (DA12-35 and DA25-350). Pentax had some wonderful lenses in the past that just needs updated. I would love to see the following lenses updated (coatings/WR & WR) and released:
FA*24
FA31 Ltd
FA*200 Macro
FA400
FA500
FA*250-600

and then a DA*11-16 and DA*135-400 to partner up with the DA*16-50 and DA*50-135.

Dave

01-19-2011, 03:16 PM   #35
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QuoteOriginally posted by Loren E Quote
WHY would Pentax continue producing SDM lenses? Ok I get how from a business perspective it might make sense (albeit unethically) to stay silent about SDM failure rates, but to put MORE SDM lenses into production????
Simple - new lenses might incorporate design changes to the focusing system that eliminate failures.

In fact even existing lens designs might have already had reliability improvements. There is no evidence to indicate that SDM is fundamentally flawed in an unfixable way without major design changes - It probably just needs minor tweaks (insufficient to drive a name change).

You only see name changes for systems that have only undergone design tweaks/changes when the initial rep for the system was REALLY awful. (Chrysler A604 renamed to 41TE after Chrysler worked out the initial kinks that clouded their transmission reliability reputation for years... The A604 did not have any fundamental design flaws, but early revisions had some serious but fixable errors that killed the unit's reputation. Half of the A604 problems were fixed with firmware updates and most of the rest were with dipstick/owner's manual corrections.)
01-20-2011, 07:11 AM   #36
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QuoteOriginally posted by Mistral75 Quote
Actually there are at least two such patents:

1/ The first one, filled 2008/08/08 and published 2010/02/18, relates to a 26-340mm f/3.6-5.8 with 20 lenses

Pentax DA?25-350mm F3.5-5.6 SDM??????????So-net???

2/ The second one, the one you quote, filled 2009/05/22 and published 2011/01/13 (yesterday), relates to a 26-340mm f/3.3-5.7 with 16 lenses including 2 ED elements.

Pentax DA*25-350mm F3.3-5.6ED [IF] SDM??????????So-net???

As APS-C lenses, they could be seen as the equivalent to the 50-500mm f/4.5-6.3 "Bigma" on FF bodies.
37.5-525 FF eqiv. but I would prefer an 18-270mm myself over the 25-350mm.
http://www.tamron.com/en/news/2010/1209.html
01-20-2011, 10:01 PM   #37
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QuoteOriginally posted by DaveBlack Quote
Why is it that Nikon has files patents for three long telephotos lenses and I would like any of them. Pentax has filed for a cropped Bigma, which I wouldn't want. Where is the DA*135-400 (the cropped version of the FA*250-600) or a DA*400 or DA*500 primes. I would love to buy a few more lenses but the last two DAL35 and DA18-135 are just not interesting.

Dave

Dave
Here is what makes the 18-135mm lens interesting: this lens is really fast focusing on K-7, K20D, K10D, etc. By keeping Pentax shooters interested in the brand by offering a performance boost to existing product, it gives Pentax time to continue growing and developing products that are going to be interesting to compliment their most interesting gear. It's hard enough to grow these days. if Pentax were to give up existing customers at the rate they were a couple of years ago, they would have little chance of bringing products like the K-5 and the 645D to market.

Let Pentax grow a bit more and we'll see more product come to market. Meanwhile the 16-50 and 60-250 on the K-5 are IQ juggernauts that offer shooting opportunities that didn't exist for any but a handful of photogs 6 months ago.
01-20-2011, 10:10 PM   #38
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I don't know guys I am not convinced about this notion that SDM has silently been improved one bit. I read weekly about DA* zooms, not all of old stock, that break down and then break down again. Based off all I have read on this forum and DPreview it seems clear to me that:

-SDM has not been improved
-the current SDM motors are not sufficient in powering DA* zooms, and that is why the 16-50, 50-135, and 60-250 keep failing on people to this day
-The primes don't need to move glass the way the zooms do, hence the lack of issues from release until present with the 55, 200, and 300...

I am picking up a craigslist DA* 55 tomorrow, but won't touch a zoom, as badly as I want to splurge the money that I shouldn't, but it is going to take an actual SDM change, not just hopefuls like I used to be wishing that SDM has been secretly improved



Oh and PS, wouldn't the 25-350 make a SWEET combo with the 12-24??

cheers! -LE

01-21-2011, 02:14 AM   #39
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60-250 keeping failing?
That's new to me....

17-70 has no problem either AFAIK
01-21-2011, 06:30 AM   #40
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Think I have only ever seen one 60-250mm failure and I'm not sure that was SDM related.
01-21-2011, 07:07 AM   #41
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QuoteOriginally posted by kales Quote
it's weird, isn't it?
And this one will not be a DA*, all DA* is with a constant max aperture.
this one, could be a plastic mount DAL anyway.

Given what this lens would weight I think the plastic mount can be safely ruled out even if it is DAL (or DALwr)
01-21-2011, 11:08 PM   #42
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QuoteOriginally posted by thibs Quote
60-250 keeping failing?
That's new to me....

17-70 has no problem either AFAIK

although not nearly as many reports as the other two zooms, I have read of multiple 60-250 failures all due to SDM here and at DPreview recently
01-22-2011, 02:15 PM   #43
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QuoteOriginally posted by Loren E Quote
although not nearly as many reports as the other two zooms, I have read of multiple 60-250 failures all due to SDM here and at DPreview recently
I havent looked on this site, but having just looked back on every page for the last 15 days on DPR (pentax section) I have only found a single reference to a broken pentax lens (sorry I have now forgotten which one it was, but I dont think it was those), som I'm really not sure where you have seen them???

woody
01-23-2011, 12:56 AM   #44
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Just checked my facts and you are right they have not been as recent as I thought, in doing my homework on what I was remembering they were actually found in threads I had searched, but still multiple accounts of the SDM failing on that lens, with typical behavior like working fine until 8 months and then failing. Definitely not as many problems as with the other 2 zooms, but this zoom is bought a lot less than those zooms. I really think it is a prime vs zoom thing based off the reports.
01-23-2011, 11:27 AM   #45
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The reason that Pentax isn't building long lenses is that no one ask's for them. You people have to start writing Pentax not the Forum. I sent them a letter last year and they said there wasn't a call for them. Even other company's don't sell many long lenses. Most people buy them used on fleabay because they are cheaper. They are planing a 400mm but that is about it. So you people need to send some letters every month not just one in your lifetime.
One other thing: They did have a 1/4 TC on the burner but after Tamron quit making them for Pentax because sales were nill, Pentax deceided to put it on the back burner till sales increased on there camera's and lenses.
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