Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
06-27-2013, 12:44 PM   #1
Veteran Member




Join Date: Jan 2010
Location: Durham, nc
Photos: Albums
Posts: 887
Fisheye lens focuses past infinity

Is this normal? Mine focuses well past infinity, which is annoying because I just want to set it at infinity and go. Instead I have to actually focus, which takes a lot of time and is not 100% foolproof.

Charles.

06-27-2013, 12:46 PM   #2
Pentaxian
carrrlangas's Avatar

Join Date: Mar 2012
Location: Cottbus (Berlin)
Photos: Gallery
Posts: 1,738
I donīt know why, but it is normal.. Same thing happens to me with my fisheye.
06-27-2013, 12:46 PM   #3
Loyal Site Supporter




Join Date: May 2011
Location: Richmond, Virginia USA
Photos: Gallery | Albums
Posts: 2,625
QuoteOriginally posted by ChopperCharles Quote
Is this normal? Mine focuses well past infinity, which is annoying because I just want to set it at infinity and go. Instead I have to actually focus, which takes a lot of time and is not 100% foolproof.

Charles.
are you talking the q fisheye? if so mine does too and i think ithers have said the same
06-27-2013, 01:12 PM   #4
Veteran Member
tclausen's Avatar

Join Date: May 2012
Posts: 1,399
QuoteOriginally posted by pearsaab Quote
are you talking the q fisheye? if so mine does too and i think ithers have said the same
Yup, that's a fairly well known characteristics of the 03 fisheye for the Q. It's kinda annoying, but you learn to live with it eventually

06-27-2013, 03:48 PM   #5
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 40,944
QuoteOriginally posted by ChopperCharles Quote
Is this normal? Mine focuses well past infinity, which is annoying because I just want to set it at infinity and go. Instead I have to actually focus, which takes a lot of time and is not 100% foolproof.

Charles.
Many lenses are like this, as the amount it will go past infinity depends on the ambient temperature.

Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)



PentaxForums.com's high server and development costs are user-supported. You can help cover those costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

06-27-2013, 03:52 PM   #6
Pentaxian
carrrlangas's Avatar

Join Date: Mar 2012
Location: Cottbus (Berlin)
Photos: Gallery
Posts: 1,738
QuoteOriginally posted by Adam Quote
Many lenses are like this, as the amount it will go past infinity depends on the ambient temperature.
But this is true for 200mm and longer lenses, am I wrong?
06-27-2013, 04:34 PM   #7
Veteran Member
digital029art's Avatar

Join Date: Jan 2011
Posts: 440
It's unusual for a fisheye to need to focus past infinity. This is something that's normally seen on super tele lenses where focus needs to be very precise to allow for material expansion. My impression is that it's cheaper to manufacture like this, since no calibration is needed at the factory .. all the "toy" series lenses are like this, btw.

Assuming you don't shoot a lot of macros or close-ups frequently ..
the solution is simple - just tape it to the big mark left of center!
06-27-2013, 04:35 PM   #8
Veteran Member
Anvh's Avatar

Join Date: Sep 2011
Posts: 4,616
all autofocus can focus past infinitie as far as i know.
It has something to do with the autofocus and focussing on far away subjects.

06-27-2013, 09:31 PM   #9
Veteran Member




Join Date: Jan 2010
Location: Durham, nc
Photos: Albums
Posts: 887
Original Poster
So, on my 50mm manual K-mount lens, I could remove the grip and adjust the infinity stop. Is it possible to do that on the Q fisheye?

Charles.
06-27-2013, 10:38 PM   #10
Veteran Member
crewl1's Avatar

Join Date: Jul 2010
Location: Los Angeles, CA
Photos: Gallery | Albums
Posts: 9,795
QuoteOriginally posted by ChopperCharles Quote
So, on my 50mm manual K-mount lens, I could remove the grip and adjust the infinity stop. Is it possible to do that on the Q fisheye?

Charles.
I haven't tried that.
For the time being I'm using tape.
I'd prefer to find a small rubber band instead.
06-28-2013, 02:35 AM   #11
Veteran Member
Anvh's Avatar

Join Date: Sep 2011
Posts: 4,616
QuoteOriginally posted by ChopperCharles Quote
So, on my 50mm manual K-mount lens, I could remove the grip and adjust the infinity stop. Is it possible to do that on the Q fisheye?
Nope none of the AF lenses i know off have that option.

Introduction to Focusing

Most new autofocus camera lenses now allow focus past infinity so the autofocus mechanism does not suffer a jolt when seeking focus and racking to the infinity setting.
06-28-2013, 06:37 AM   #12
Veteran Member
ve2vfd's Avatar

Join Date: Aug 2007
Location: Montreal, Canada
Photos: Gallery
Posts: 2,433
Don't forget that the Q fisheye is in the line of the "cheap toy lenses"... construction tolerances are not very tight, don't expect too much from it...

On the other hand for it's price it's an amazing tough little lens... mine survived a trip thru the washing machine in my trousers pockets... (darn tiny lenses!!!) it's a bit scratched and has mild water spots inside the lens and regardless of all that it's still usable.

Pat
06-28-2013, 08:28 AM   #13
Veteran Member




Join Date: Jan 2010
Location: Durham, nc
Photos: Albums
Posts: 887
Original Poster
Anvh... this is a manual focus lens
06-28-2013, 08:41 AM   #14
Veteran Member
crewl1's Avatar

Join Date: Jul 2010
Location: Los Angeles, CA
Photos: Gallery | Albums
Posts: 9,795
Following up on my note above - has anyone found a source for small bands that can be used on the 03 to keep the focus locked in one spot like these?

06-28-2013, 09:55 AM   #15
Pentaxian




Join Date: Oct 2006
Location: Chicago suburb, IL, USA
Posts: 1,535
QuoteOriginally posted by ve2vfd Quote
Don't forget that the Q fisheye is in the line of the "cheap toy lenses"... construction tolerances are not very tight, don't expect too much from it...
Hi Pat,

I don't think this is necessarily the case. Though it's inexpensive and manual focus, It was never designated a "toy" lens, and doesn't perform like one, IMO. Instead of downgrading it to toy status, I think it should be appreciated for what it is -- the most affordable FE lens ever offered by an OEM for a system camera.

Perhaps it would make people happier if it was AF, didn't focus past infinity, and cost over $400 like most other OEM FEs.

QuoteQuote:
On the other hand for it's price it's an amazing tough little lens... mine survived a trip thru the washing machine in my trousers pockets... (darn tiny lenses!!!) it's a bit scratched and has mild water spots inside the lens and regardless of all that it's still usable.
That's amazing! I'd never expect that any lens would actually be usable after this.

IMO, Pentax released this lens as a bonus -- AFAIK, the only FE lens on a compact, to show that the Q system can go photographically where others will not.

Scott
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!
camera, fisheye lens, infinity, mirrorless, pentax q, pentax q10, pentax q7, q10, q7
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
DA15 goes past infinity Siegfried Pentax SLR Lens Discussion 19 11-13-2015 11:17 AM
Spotmatic focuses past infinity? kcobain1992 Pentax Film SLR Discussion 18 02-28-2011 08:26 AM
Lens focuses fine at close distance, not sure about infinity? bdery Pentax SLR Lens Discussion 4 08-16-2009 12:43 PM
300mm f4 m42 focuses past inf. on k10 Chris Stearns Pentax SLR Lens Discussion 4 05-27-2009 10:47 PM
Why focus past infinity alehel Pentax SLR Lens Discussion 8 05-15-2009 02:41 PM



All times are GMT -7. The time now is 04:07 AM. | 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