Forgot Password
Pentax Camera Forums Home
 

View Poll Results: Should PENTAX make a f/1.0 or faster lens?
Yes 5340.15%
No 7959.85%
Voters: 132. You may not vote on this poll

Reply
Show Printable Version Search this Thread
06-02-2011, 08:36 PM   #31
Veteran Member
wlachan's Avatar

Join Date: Sep 2006
Location: Canada
Photos: Albums
Posts: 2,626
QuoteOriginally posted by DragonLord Quote
Well, the Canon EF 50mm f/1.0L lens did suffer from slow AF, probably because of the extremely shallow depth of field.
I believe it was due to the amount of glasses the motor has to move. Anyway, such fast glass is a statement rather than necessity.

06-02-2011, 08:38 PM - 1 Like   #32
Ash
Community Manager
Loyal Site Supporter
Ash's Avatar

Join Date: Mar 2007
Location: Toowoomba, Queensland
Photos: Gallery | Albums
Posts: 22,695
f/1.2 is certainly fast enough.
Current A 50/1.2s could be redesigned to be a DA* (but more likely a DA ltd since there is already the DA* 55) and there will be a lot of happy Pentaxians around.

But there are still big gaps in the telephoto focal lengths Pentax still has to consider, as limtied as the market is in this area, they do have to find some DA replacements for their previous 400 and 500mm lenses (not many serious shooters will be attracted to a system limited to 300mm of reach with a max aperture of f/4)

Last edited by Ash; 06-02-2011 at 08:45 PM.
06-02-2011, 09:37 PM   #33
Veteran Member
goddo31's Avatar

Join Date: Feb 2009
Location: Perth, Western Australia
Photos: Gallery | Albums
Posts: 2,295
QuoteOriginally posted by Ash Quote
f/1.2 is certainly fast enough.
Current A 50/1.2s could be redesigned to be a DA* (but more likely a DA ltd since there is already the DA* 55) and there will be a lot of happy Pentaxians around.

But there are still big gaps in the telephoto focal lengths Pentax still has to consider, as limtied as the market is in this area, they do have to find some DA replacements for their previous 400 and 500mm lenses (not many serious shooters will be attracted to a system limited to 300mm of reach with a max aperture of f/4)
As usual, Ash is spot on...

QuoteOriginally posted by Dragonlord:
Well, the Canon EF 50mm f/1.0L lens did suffer from slow AF, probably because of the extremely shallow depth of field.
Even if it is slow with the f/1.0, is it accurate? Even with an AF version of the f/1.2, I'm thinking it would be a pretty hard task for an AF system to focus. Especially at closer distances.
06-02-2011, 10:31 PM   #34
Pentaxian




Join Date: Oct 2009
Location: North
Photos: Gallery
Posts: 3,921
QuoteOriginally posted by dgaies Quote
True and true, and yet I'd probably buy one anyway
Ha.. ha... logical justification is one thing. Addiction throws that out the window

06-02-2011, 11:24 PM   #35
Veteran Member
Pentaxor's Avatar

Join Date: May 2009
Location: Vancouver, B.C.
Photos: Gallery
Posts: 6,513
QuoteOriginally posted by goddo31 Quote
As usual, Ash is spot on...



Even if it is slow with the f/1.0, is it accurate? Even with an AF version of the f/1.2, I'm thinking it would be a pretty hard task for an AF system to focus. Especially at closer distances.
I'm not sure why focus accuracy should even be an issue. focus accuracy depends more on tolerance and optical precision of the elements and electronic configuration during autofocus operations. otherwise, it would be pointless to have AF if it can't even focus correctly. if it does AF, then surely it could focus. most of the focus problems of ultra-fast lenses are more related to decentering, tolerance adjustment ( camera AF fine adjust plays a significant role ) or getting a lemon.
06-02-2011, 11:50 PM   #36
Veteran Member
vrrattko's Avatar

Join Date: Jun 2010
Photos: Albums
Posts: 734
Eruditass

i believe for better separation of background you'll do the same with fast telephoto, let's say A85 1.4 or FA77 1.8 than with 50 1.0, hence my opinion that such lens would be impractical, not to mention it's optical quality at wide open would be surely inferior.
06-03-2011, 12:59 AM   #37
Senior Member




Join Date: Aug 2010
Posts: 151
I voted No partly because I personally don't need a lens like this, but even if there are photographers out there who produce interesting results with such a lens, I agree with, it seems, most posters here that this would be a quite specialized piece of glass and there are other gaps in the Pentax lineup which probably would bring in more revenue for the company.
06-03-2011, 01:04 AM   #38
Senior Member
Kim C's Avatar

Join Date: Dec 2006
Location: Lincoln, UK
Photos: Gallery
Posts: 229
No. The main use for the ultra fast 50'd has been for street photography to avoid the use of flash when using (relatively) slow film.

Once stopped down, the lenses perform no better and in many cases worse than their slower counterparts.

Kim

06-03-2011, 02:40 AM   #39
Ash
Community Manager
Loyal Site Supporter
Ash's Avatar

Join Date: Mar 2007
Location: Toowoomba, Queensland
Photos: Gallery | Albums
Posts: 22,695
QuoteOriginally posted by Kim C Quote
Once stopped down, the lenses perform no better and in many cases worse than their slower counterparts
The FA & DA ltds (and even the DA L 35 f/2.4) are prime examples of this.
06-03-2011, 03:00 AM   #40
Site Supporter
robbiec's Avatar

Join Date: Feb 2009
Location: Cork, Ireland
Photos: Albums
Posts: 1,220
The glass has been done already, if Pentax were to look at doing something like this then their resources should first be concentrated on the AF system, get that capable of handling f/1.2, which would be a benefit throughout the system and then deliver an AF f/1.2 lens.
06-03-2011, 03:23 AM   #41
Forum Member
AKum8's Avatar

Join Date: Jul 2010
Location: Milan
Posts: 89
I would say that Pentax is not going to produce faster lenses for two reasons:
1. High ISO capabilities of recent cameras
2. Have you ever read this articles?
http://www.luminous-landscape.com/essays/an_open_letter_to_the_major_camera_manufacturers.shtml

If you read it carefully, it explains a lot about the latest Pentax's choices of not commercialise lenses faster than f/2.4

Cheers,
Andrea
06-03-2011, 04:24 AM   #42
Pentaxian
8540tomg's Avatar

Join Date: Feb 2008
Location: Waterloo, Ontario
Photos: Gallery
Posts: 4,454
A super fast lens is not something I necessarily need or want but that doesn’t mean Pentax shouldn’t go ahead and design/produce one. As others have noted above better flash, faster AF and some longer telephoto lenses are certainly more practical places for Pentax to spend their time and money. That being said there is a certain marketing value to having an f 1.0 or faster lens out there. I doubt Leica or Canon sell many of these super fast wonders but they do keep people talking about their products in a manner they don’t talk about Pentax. A case in point is this thread about super fast glass. As we all know marketing, (does Pentax have a marketing department?) is not one of Pentax’s strengths. Might it not be worth while, from a marketing point of view, to go ahead and produce some fast glass even if they take a bit of a loss in the process?

Tom G
06-03-2011, 05:26 AM   #43
Pentaxian
Clavius's Avatar

Join Date: Feb 2011
Location: De Klundert
Photos: Gallery
Posts: 4,122
I agree too that there are other gaps to fill in Pentax' lineup of products. Enough examples have been given in the previous posts. But... Those gaps have already been filled by the other brands. That wouldn't give Pentax a real benefit over the other brands.

Having a Pentax DA 50mm 1.0 or 1.2 ltd, preferably better affordable then similar lenses of the other brands, will lure certain people to Pentax. Especially if it performed well enough.
06-03-2011, 06:08 AM   #44
Pentaxian
Ratmagiclady's Avatar

Join Date: Nov 2008
Location: GA
Photos: Gallery | Albums
Posts: 13,476
QuoteOriginally posted by paperbag846 Quote
I believe it is impossible to go faster than f1.2 on the K mount.
I believe you're right, actually, (The mount just doesn't leave enough room for that big a rear element) which makes the rest of this kind of academic.

I really don't see call for that, anyway, given ongoing improvements in high-iso and the fact that there's a lot of other lenses, basic or exotic, that are lacking.
06-03-2011, 07:05 AM   #45
Loyal Site Supporter
bwDraco's Avatar

Join Date: Jul 2010
Location: New York
Photos: Albums
Posts: 1,015
Original Poster
The size of the lens mount does not limit maximum aperture. See this Ken Rockwell article: Nikon f/0.95 Lenses.

I agree that a lens of this kind is not truly that practical, though it may have its uses, and there are many other places PENTAX can spend time and money on, such as a wider selection of telephoto lenses.
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!
k-mount, lens, pentax, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Example of AF, DR, high ISO and high shutter speed on K-5 benisona Pentax DSLR Discussion 17 11-30-2010 02:25 PM
People High Speed tootall Post Your Photos! 5 03-04-2010 06:36 AM
High speed fps - Pentax K100D IsaacSteiner Pentax DSLR Discussion 5 05-12-2009 12:00 PM
Make work a 50mm lens with my k100d super ? loopingz Pentax DSLR Discussion 3 12-16-2008 12:17 PM
Sigma EF 530 Super and high-speed sync mattdm Flashes, Lighting, and Studio 5 02-11-2008 05:52 PM



All times are GMT -7. The time now is 02:47 PM. | 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