Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
03-07-2010, 10:22 PM   #1
Site Supporter

Join Date: Oct 2009
Location: Austin
Posts: 132
Tamron 17-50

It sounds like the only potential problem with this lens may be ff/bf. If this occurs with the Kx is there a way to callibrate it? I've heard of debug mode, but know nothing about it.

03-08-2010, 12:47 AM   #2
Senior Member

Join Date: May 2008
Location: New Westminster, Canada
Photos: Gallery
Posts: 280
I heard you have to send it back to Tamron.
03-08-2010, 01:39 AM   #3
Senior Member

Join Date: Aug 2007
Location: Perth, Australia
Posts: 268
Lens ff/bf also can be due to sensor alignment. If thats the case, debug mode will help.
Google debug mode for pentax, and you shall get what you look for. or search the forum.

Most of my lenses are spot on... thats after I've realigned my sensor using the debug mode.
I did it for my K10D and Kx.
03-08-2010, 01:49 AM   #4
Site Supporter
shiner's Avatar

Join Date: Jan 2009
Location: N GA USA
Photos: Gallery | Albums
Posts: 1,454
I thought my Tamron 17-50 might be FF on my K20D, until I ran some tests tonight and apparently it is bang on. Must just be me...

03-08-2010, 07:17 AM   #5
Veteran Member

Join Date: Nov 2009
Location: Hong Kong
Posts: 1,352
RiceHigh describes how to adjust the K-x here:

RiceHigh's Pentax Blog: K-x Debug Mode Tutorial - AF Adjustment
03-08-2010, 07:50 AM   #6
Senior Member

Join Date: Feb 2009
Location: Pilsen, Czech Republic
Posts: 224
I had awful FF on mine (new one), Pentax K-x. I sent it to Tamron service and they fixed it under warranty (they just needed to know the camera model). Now it's spot on.

There is something about optical axis alignment and eeprom flashing in the log from the service.
03-08-2010, 09:49 AM   #7
Veteran Member
Jewelltrail's Avatar

Join Date: May 2008
Location: Rhode Island
Photos: Albums
Posts: 4,180
I do not own a Kx, yet anyway, but did buy a Tamron 17-50mm for my K20 about 2 years ago. It is spot on, no need for any adjustments in the K20d. I have read discussion where others used RiceHigh's blog to adjust their Kx.
03-10-2010, 05:14 AM   #8
Veteran Member
rustynail925's Avatar

Join Date: Aug 2009
Location: Philippines
Photos: Gallery
Posts: 1,552
The tamron 17-50 is a very good lens IQ/price and has good reviews as long as theres no FF. Ive been waiting for an oppurtunity to get this lens but i cant take the risks of having an FF problem.

03-10-2010, 12:10 PM   #9
Senior Member

Join Date: Oct 2009
Location: Germany
Posts: 154
I went through the whole cycle of buying, testing, returning, testing a second piece etc... and finally kept the second copy... I was quite sure even the second had some FF ... but in real-life situations I have been getting great shots from it...

Here's my experience with the whole FF/BF bit ...!

Last edited by rkt; 06-11-2010 at 07:32 AM. Reason: added link to my post ...
03-10-2010, 02:21 PM   #10
Senior Member

Join Date: Feb 2010
Location: tampa, fl
Photos: Gallery
Posts: 237
uuummm, what is bf/ff. i have the k-x and the tamron 17-50 and havent noticed any focus issue, manual or auto. what are you guys talking about? im a noob so i apologize in advance.
03-10-2010, 02:34 PM   #11
Senior Member

Join Date: Feb 2010
Location: Bærum, Norway
Posts: 102
QuoteOriginally posted by boosted03gti Quote
uuummm, what is bf/ff. i have the k-x and the tamron 17-50 and havent noticed any focus issue, manual or auto. what are you guys talking about? im a noob so i apologize in advance.
bf= back focus
ff=front focus

refers to wether the focus plane is in front of/behind where you focus.

Did that make sense to you? (I'm new to this to....)
03-10-2010, 06:57 PM   #12
Site Supporter

Join Date: Oct 2009
Location: Austin
Posts: 132
Original Poster
Great information. Thanks everyone. This is why I really like this forum. It sounds like between debug mode and/or sending it back to Tamron, ff/bf is fixable.

  • 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, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Tamron 17-50mm, Tamron 28-75mm, Sigma 17-70mm, which lens for my trip to Greece? macky112 Pentax SLR Lens Discussion 15 11-20-2011 03:08 PM
For Sale - Sold: K10D, Tamron 28-75 F2.8, Tamron 75-300 F4-5.6, Super-Tak 50/1.4, AF-360 Flash maconmatt Sold Items 5 10-25-2010 06:18 AM
For Sale - Sold: Sigma 24-60mm F2.8 (K mount) and Tamron Adaptall 24mm F2.5 with Tamron P/K ada pxpaulx Sold Items 4 08-27-2010 08:47 PM
For Sale - Sold: Pentax K100d + 18-55mm + Tamron 70-300mm; Tamron 90mm Macro jake123 Sold Items 4 11-09-2009 12:51 PM
For Sale - Sold: Tamron SP 70-210mm f/3.5, Tamron SP 28-135mm f/4.0-4.5 28A, Tamron pk/a adapta hinman Sold Items 14 05-08-2009 05:35 PM

All times are GMT -7. The time now is 03:43 PM. | See also:, 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?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]