Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-11-2009, 11:19 PM   #46
Pentaxian
thibs's Avatar

Join Date: Jun 2007
Location: Belgium
Photos: Albums
Posts: 5,245
QuoteOriginally posted by awo425 Quote
not sure how good Pentax DA*55 will be, but according to quite a few users on one of the Nikon forums, Sigma 50MM F1.4 EX DG HSM is better in there opinion than new Nikon 50 mm G lens. I was very surprised to here that.
and am I. I will scrap what I read about this sigma 50mm and more about it. A cheap DA 35/1.4 or 1.8 would be a nice addition.

02-11-2009, 11:37 PM   #47
Senior Member




Join Date: Feb 2007
Location: Michigan/USA
Posts: 173
Best price I have seen for the DA*55/1.4 is at Adorama, $729 shipped.

21790 Pentax SMCP-DA* 55mm f/1.4 SDM Auto Focus Lens for use with Pentax Digital SLR Cameras.

I am really looking forward to seeing many photos from this lens on the forums!
02-12-2009, 09:05 AM   #48
Veteran Member




Join Date: Mar 2007
Location: Philippines
Posts: 1,399
QuoteOriginally posted by Art Vandelay II Quote
That does look perfectly fine on 24x36. I wish they would have made it a standard 50mm now instead of 55mm since it can do both. Even if Pentax doesn't plan on making a FF DSLR they really need to clarify which lenses work and which ones don't for the benefit of film users if no other reason. Digging through forum threads isn't exactly the way most people like to find their info.
While that most certainly is a welcome move on Pentax's part (I know I'd appreciate that), I don't see them doing so. For one, they'd rather we be buying and shooting their digital SLRs already. Their marketing would extend only to say that the ~24 million lenses made for the K-mount will work on the new DSLRs.
02-12-2009, 01:13 PM   #49
Senior Member




Join Date: Oct 2007
Location: Verona, Italy
Posts: 202
QuoteOriginally posted by Art Vandelay II Quote
That does look perfectly fine on 24x36. I wish they would have made it a standard 50mm now instead of 55mm since it can do both. Even if Pentax doesn't plan on making a FF DSLR they really need to clarify which lenses work and which ones don't for the benefit of film users if no other reason. Digging through forum threads isn't exactly the way most people like to find their info.
55/1.8 was Spotmatic's standard lens, so it's really back to the roots

02-12-2009, 07:50 PM   #50
Veteran Member
Adrian Owerko's Avatar

Join Date: Feb 2008
Location: South Australia
Posts: 435
This lens needs to be in the $600 usd park for me.. AUD $1000.. Damm I hate waiting lol..
02-13-2009, 04:47 AM   #51
Inactive Account




Join Date: Jan 2008
Location: Ontario, Canada
Posts: 1,972
QuoteOriginally posted by zntgrg Quote
55/1.8 was Spotmatic's standard lens, so it's really back to the roots
Except that it's being used on a crop sensor and acts more like a 82.5mm lens (i.e. 85mm in film).

c[_]
02-13-2009, 04:56 AM   #52
Inactive Account




Join Date: Sep 2008
Location: Slovenia
Photos: Gallery
Posts: 279
Actually it acts the same as a 55mm f/1.4 lens on film with 1.5 of the picture thrown away.

It's the same as a 55mm lens on film regarding flattening the frame. Or in this case of focal length, distorting it.

Just imagine taking a picture at 55mm on film and cutting out a 1.5 crop ... it's as simple as that.

That's why the DOF is different from a 85mm f/1.4 lens on film and hence the new DA* 55mm f/1.4 DOES NOT act like a 85mm f/1.4 on film. Far from it.
02-13-2009, 05:08 AM   #53
Veteran Member
roentarre's Avatar

Join Date: Oct 2006
Location: Melbourne, Australia
Posts: 11,794
QuoteOriginally posted by fejker Quote

That's why the DOF is different from a 85mm f/1.4 lens on film and hence the new DA* 55mm f/1.4 DOES NOT act like a 85mm f/1.4 on film. Far from it.
Da* 55mm f1.4 better not performs like 85mm f1.4, exhibiting purple fringeing in such an impeccable fashion.

I really want to see a good 85mm f1.4 image where the depth of field really helps with the composition and mood...

Bokeh is not all that great on 85mm f1.4 and bokeh is often a feature to compliment a theme...

Let's wait til Da* 55mm f1.4 released first and see how it goes with some unscientific testing comparison...

02-13-2009, 06:34 AM   #54
TKH
Veteran Member
TKH's Avatar

Join Date: Aug 2007
Location: Germany
Posts: 371
QuoteOriginally posted by roentarre Quote

Let's wait til Da* 55mm f1.4 released first and see how it goes with some unscientific testing comparison...
Unscientific sounds good, I will try it.

I just received a mail from my dealer. The DA*55 is in stock. I pic it up on tuesday morning and will report on tuesday evening.

Rainer
02-13-2009, 09:44 AM   #55
Pentaxian
Ratmagiclady's Avatar

Join Date: Nov 2008
Location: GA
Photos: Gallery | Albums
Posts: 13,470
It'll be a while before I could lay hands to one, but I do have some high hopes for this one. The 85 is my favorite lens on film, and a 55 is closer to this than a 50.

If it *does* work on full-frame, that's great, too, (though I'd need to get a film body that can work without an aperture ring) ... I like things a little tighter, in that range, anyway.
02-13-2009, 12:15 PM   #56
Senior Member




Join Date: Oct 2007
Location: Verona, Italy
Posts: 202
QuoteOriginally posted by fejker Quote
That's why the DOF is different from a 85mm f/1.4 lens on film and hence the new DA* 55mm f/1.4 DOES NOT act like a 85mm f/1.4 on film. Far from it.

Not really. The optical scheme is lot more complicated than the usual 50mm, is tuned for portrait mode, it's really a "truncated 85". It's the goal of the lens.
02-18-2009, 01:20 AM   #57
jay
Inactive Account




Join Date: Feb 2009
Location: Lincoln, Nebraska, USA
Posts: 65
QuoteOriginally posted by zntgrg Quote
Not really. The optical scheme is lot more complicated than the usual 50mm, is tuned for portrait mode, it's really a "truncated 85". It's the goal of the lens.
Please explain to me what a "Truncated 85" is, because this doesn't make any sense to me. Yes, I've seen the lens diagram, but I don't see how

An equivalent 85/1.4 would probably be something more like a 55/1.2, wouldn't it?
02-18-2009, 01:29 AM   #58
Pentaxian
thibs's Avatar

Join Date: Jun 2007
Location: Belgium
Photos: Albums
Posts: 5,245
QuoteOriginally posted by jay Quote

An equivalent 85/1.4 would probably be something more like a 55/1.2, wouldn't it?
Is your suggestion *that* different than a 55/1.4 ?
02-18-2009, 01:48 AM   #59
jay
Inactive Account




Join Date: Feb 2009
Location: Lincoln, Nebraska, USA
Posts: 65
QuoteOriginally posted by thibs Quote
Is your suggestion *that* different than a 55/1.4 ?
It was actually an honest question.

If you take a 35mm film camera and put an 85mm lens on it, and frame your portrait, then -- without moving, switch to a digital body with a 55mm f/1.4, the perspective hasn't changed; I know that's true.

But has the depth of field? I know that if you put an 85mm lens on a digital camera, and switch to a full-frame camera, the digital camera will have less depth of field.

But, to maintain the "look" do we need to maintain the relative aperture?

85mm f/1.4 ==> 85/1.4 = 60mm aperture
50mm f/1.4 ==> 50/1.4 = 36mm aperture

Yes, I know that only simple lenses (say, a single lens element) has an aperture that's the size of the focal length / f-stop. But does the concept still apply? In other words, do we really need a 55mm f/0.92 to simulate the appearance of an 85/1.4?
02-18-2009, 02:01 AM   #60
Pentaxian
thibs's Avatar

Join Date: Jun 2007
Location: Belgium
Photos: Albums
Posts: 5,245
QuoteOriginally posted by jay Quote
It was actually an honest question.

If you take a 35mm film camera and put an 85mm lens on it, and frame your portrait, then -- without moving, switch to a digital body with a 55mm f/1.4, the perspective hasn't changed; I know that's true.

But has the depth of field? I know that if you put an 85mm lens on a digital camera, and switch to a full-frame camera, the digital camera will have less depth of field.

But, to maintain the "look" do we need to maintain the relative aperture?

85mm f/1.4 ==> 85/1.4 = 60mm aperture
50mm f/1.4 ==> 50/1.4 = 36mm aperture

Yes, I know that only simple lenses (say, a single lens element) has an aperture that's the size of the focal length / f-stop. But does the concept still apply? In other words, do we really need a 55mm f/0.92 to simulate the appearance of an 85/1.4?
Sorry, I'm used to usual sarcasm on this kind of topic

Yes indeed you're right. But manufacturers do not do this. Pentax keeps aperture as the 35mm lenses (so a little more DOF than the 35mm lenses but FOV is the same). Olympus takes it into a account but barely to Pentax levels (as far as DOF is concerned).

So yes there's a little bit less DOF control on APS-C and 4:3 systems. As the deficit is about half a stop to a full stop, I still fail to see the absolute need for Full frame (except special purpose of course, but in general), speaking about DOF: not pixels/Iso etc.
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!
pentax, pentax news, pentax rumors
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: K20D - DBG Grip - DA18-55mm WR - 18-55mm DAL VaughnA Sold Items 7 03-13-2010 05:40 PM
Is this lens going to be better or the same than my A50 f1.4mm?? dragonfly Pentax SLR Lens Discussion 10 03-01-2010 12:32 PM
DA 18-55mm AL II vs DAL 18-55mm (kit lens) vs DA 18-55mm WR rustynail925 Pentax SLR Lens Discussion 10 01-08-2010 02:06 PM
Fuji Fujinon 1:1.8 55mm vs. Super-Multi-Coated Takumar 1:1.8 55mm carpents Pentax SLR Lens Discussion 6 06-27-2007 05:25 PM



All times are GMT -7. The time now is 07:52 AM. | See also: NikonForums.com, CanonForums.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