Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
04-18-2013, 07:48 AM   #76
Pentaxian
Fogel70's Avatar

Join Date: Sep 2009
Location: Stockholm, Sweden
Photos: Albums
Posts: 1,737
QuoteOriginally posted by RonHendriks1966 Quote
Well this is a very hefty lens. I don't get it, why not 18-35mm/f2.0, that already would make the lens lighter and still unique. Who is it for?
Probably because they started with a f/2.8 FF design and used it with a APS-C (1.53 crop) speed booster, which makes it end up as f/1.83.

04-18-2013, 07:48 AM   #77
Pentaxian
Mistral75's Avatar

Join Date: Feb 2009
Location: Paris
Posts: 2,777
QuoteOriginally posted by Cynog Ap Brychan Quote
I don't know about Tamron abandoning Pentax. That (approx.) 12 mm to (approx.) 28 mm on the Pentax road map for 2013 (or later) looks remarkably like the recently released Tamron AT-X 12-28 Pro DX lens.
Err... You mean Tokina, I presume?
04-18-2013, 08:04 AM   #78
Site Supporter
Cynog Ap Brychan's Avatar

Join Date: Sep 2012
Location: Gloucester
Photos: Gallery
Posts: 1,090
QuoteOriginally posted by Mistral75 Quote
Err... You mean Tokina, I presume?
Facepalm! Yes... I meant Tokina! perhaps Tamron have abandoned us after all.
04-18-2013, 08:26 AM   #79
Site Supporter




Join Date: Sep 2012
Photos: Gallery | Albums
Posts: 1,728
I'm not sure I follow the logic behind this lens. Seems at wide angles, the benefit of large apertures is less than for other focal lengths to the point where the size/weight cost becomes more than the max aperture justifies. What am I missing here?

04-18-2013, 08:37 AM   #80
Pentaxian




Join Date: Apr 2008
Location: Central Ohio (formerly SF Bay Area)
Posts: 1,464
QuoteOriginally posted by kenyee Quote
This actually has me worried. First Tamron abandons Pentax (understandable since they probably don't want to reverse engineer Pentax's SDM tech) and now it looks like Sigma might release fewer lens for Pentax. I wonder what their Pentax sales look like?
I imagine their Pentax K-mount sales would be considerably higher than their Sigma SA-mount sales.

And yet they are making it for the latter.
04-18-2013, 09:26 AM   #81
Pentaxian
thibs's Avatar

Join Date: Jun 2007
Location: Belgium
Photos: Albums
Posts: 5,159
QuoteOriginally posted by Quicksand Quote
I imagine their Pentax K-mount sales would be considerably higher than their Sigma SA-mount sales.

And yet they are making it for the latter.
Yep of course, that's auto-promotion. And the other mounts, well, they have to. It's not more complicated than that.
04-18-2013, 09:38 AM   #82
Pentaxian
Mistral75's Avatar

Join Date: Feb 2009
Location: Paris
Posts: 2,777
Auto-promotion plus the fact that this lens is probably the best wide angle to illustrate the qualities of the Sigma SD1's 3x15 Mpixels Foveon sensor.
04-18-2013, 10:07 AM   #83
Veteran Member




Join Date: Nov 2009
Location: Hong Kong
Posts: 1,352
Hilarious thread.

Lots of aurguable points made.

Some very good points made.

As Mistral just said, this is a Sigma APSC play.

When a Foveon FF sensor is cost-effective, this lens won't matter to them.

It won't matter to many starting today.

04-18-2013, 10:39 AM   #84
Veteran Member




Join Date: Dec 2010
Location: 11432
Photos: Albums
Posts: 375
I want this lens for Pentax.... do they?
04-18-2013, 12:01 PM   #85
Pentaxian
Asahiflex's Avatar

Join Date: Jan 2008
Location: Netherlands
Photos: Gallery
Posts: 2,753
A Sigma SA version is easy to manufacture for Sigma, because the similarities with the Canon EF mount are bigger than the differences. They use the same protocol, have the same contacts and even the register distance is the same... Only the bayonet differs.
04-18-2013, 12:18 PM - 3 Likes   #86
Veteran Member
Smeggypants's Avatar

Join Date: Sep 2010
Posts: 1,536
QuoteOriginally posted by gazonk Quote
I'm sorry but while the 1.8 aperture is impressive, it's ridiculously large and absurdly heavy (810g!!) for a 2x moderate wide angle zoom.
I'm sure they didn't make it "ridiculously large and absurdly heavy" on purpose just to annoy you

Lens specs and performance are far more important to me than the size and weight.
04-18-2013, 12:29 PM   #87
Pentaxian
gazonk's Avatar

Join Date: Feb 2009
Location: Oslo area, Norway
Photos: Gallery | Albums
Posts: 3,509
QuoteOriginally posted by Smeggypants Quote
I'm sure they didn't make it "ridiculously large and absurdly heavy" on purpose just to annoy you
Of course not. And it's a great achievement and may be good for Sigma because of the press it gets. But which tiny fraction of the Canikon market consists of customers that are willing to buy such an expensive, large and heavy wide angle/standard zoom lens - and who do not already own a full format body?
04-18-2013, 01:01 PM   #88
Pentaxian
RonHendriks1966's Avatar

Join Date: Jan 2009
Photos: Gallery
Posts: 8,556
QuoteOriginally posted by gazonk Quote
Of course not. And it's a great achievement and may be good for Sigma because of the press it gets. But which tiny fraction of the Canikon market consists of customers that are willing to buy such an expensive, large and heavy wide angle/standard zoom lens - and who do not already own a full format body?
I think this a very valid one. People with say 7D and 5D don't buy this lens, since it only will fit to one camera. Those who can't afford 5D can't afford this lens.
04-18-2013, 02:50 PM   #89
Veteran Member
Sol Invictus's Avatar

Join Date: Aug 2011
Location: Calgary, Alberta
Photos: Gallery
Posts: 392
QuoteOriginally posted by RonHendriks1966 Quote
I think this a very valid one. People with say 7D and 5D don't buy this lens, since it only will fit to one camera. Those who can't afford 5D can't afford this lens.
I think this is a halo product. Sigma doesn't necessarily need to move a lot of units. It's there to draw attention to Sigma and display what their engineers are capable of.

A while back, the president of Sigma noted in an interview that he didn't want to be viewed as a discount inferior brand for people who couldn't afford the OEM lenses. They wanted to compete directly with the best from Nikon and Canon. After the Sigma 35, the 120-300 f/2.8 and this lens, they are making a lot of very positive noise.
04-18-2013, 02:58 PM - 1 Like   #90
Banned




Join Date: Sep 2006
Location: Millstone,NJ
Posts: 6,491
QuoteOriginally posted by gazonk Quote
But the point in this case is the other way round: By buying a lens like this one, you're losing the APS-C advantage, because you get something as heavy as those 24-70/2.8 zooms and you gain nothing but lose zoom range.
Here is your lens:
Pentax smc Pentax-DA 18-270mm f/3.5-6.3 ED SDM Lens 21497 B&H
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
18-35mm, 18-35mm f/1.8 dc, dc, dc hsm lens, f/1.8, f/1.8 dc hsm, hsm, lens, pentax news, pentax rumors, sigma, sigma 18-35mm f/1.8
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sigma 17-50mm f/2.8 EX DC OS HSM Lens Samples pop4 Lens Sample Photo Archive 12 09-08-2016 06:34 AM
For Sale - Sold: Sigma 18-50mm f/2.8-4.5 (DC HSM) Pentaxguy22 Sold Items 4 01-24-2013 06:39 AM
pentax 18-135mm wr lens vs sigma 18-125mm dc os hsm lens atg Pentax K-5 5 12-14-2012 08:24 AM
Sigma 17-70mm f/2.8-4 DC Macro OS HSM Lens infos Pentax SLR Lens Discussion 11 10-18-2012 09:03 PM



All times are GMT -7. The time now is 03:52 PM. | See also: NikonForums.com, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top