Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
01-28-2011, 04:38 PM   #1
Senior Member
dmfw's Avatar

Join Date: Dec 2009
Location: Dallas, Tx
Photos: Albums
Posts: 159
Used Lens: What Quick Checks before you buy?

I shop at a jumble sale, and wished to purchase a lenses. However, I never purchased a used Lens from someone not online or in a shop. So:
  • What quick checks should I do before I buy the lens? (Beyond the obvious: checking the F ring, the focus is smooth)
  • How can you quickly determine if the glass is not damaged
  • Is there a quick way to spot a Pentax Mount vs. one for another camera.

Thanks

01-28-2011, 05:18 PM   #2
Pentaxian
Nick Siebers's Avatar

Join Date: Jun 2008
Location: Madison, WI
Photos: Gallery | Albums
Posts: 2,139
Make sure the rings turn smoothly. Make sure the lens stops down quickly and opens up quickly again when the lever on the bottom is flicked. Shine a penlight through from one end looking in the other, that will show you internal haze or fungus as well as the degree of internal dust.

As for the mount, with just a little time you should be able to recognize one. One trick would be to bring along a K1000 or similar manual SLR. You could be sure it mounts. And then with the back open you could fire it at top shutter speed to be sure it stops down all the way to its minimum (largest number) f stop.

Good luck!
01-28-2011, 06:32 PM   #3
Site Supporter
ramseybuckeye's Avatar

Join Date: Apr 2009
Location: Elida, Ohio
Photos: Gallery | Albums
Posts: 8,113
Good info from Nick, don't forget a bright flashlight. Check for oil on the aperture blades too. Make sure that aperture lever looks good to. Also check the filter threads for dents and shake it a little for loose parts inside. If you don't have a camera to mount it, do a good visual to make sure it hasn't been abused. Hope you find some gems!
01-28-2011, 07:11 PM   #4
Veteran Member
RioRico's Avatar

Join Date: Jun 2008
Location: Limbo, California
Posts: 11,264
If I may be a bit immodest... I wrote the canonical guide [ https://www.pentaxforums.com/forums/pentax-lens-articles/59245-pawnshop-lense...ers-guide.html ] that some members here think is worthwhile. Good luck!

01-28-2011, 07:15 PM   #5
Pentaxian
Nick Siebers's Avatar

Join Date: Jun 2008
Location: Madison, WI
Photos: Gallery | Albums
Posts: 2,139
Indeed RR, I should have mentioned that.
01-28-2011, 08:05 PM   #6
Senior Member




Join Date: May 2010
Location: Montreal
Posts: 197
Why not print up a focus test chart and keep it handy in the car/camera bag,
a quick test on a counter top could reveal focus, sharpness issues before buying a bad lens.

PENTAX DSLRs: PART-1. Free Autofocus Adjustment charts for front and back focusing problems. Good for Pentax, Canon and Nikon.
01-28-2011, 08:10 PM   #7
Veteran Member




Join Date: Aug 2009
Posts: 381
+1 flicking the aperture lever at the rear whilst watching the blades, with lens set to f16/f22. Check the screws at the rear to see if someone ham-fisted has been in it: a decent repair guy will not chew screws up.

Take your camera along and try shooting a few pics off. Get a M42-K mount converter in advance. Main duty for my *ist DS is to test the lenses I buy.
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!
checks, k-mount, lens, pentax lens, shop, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Should I buy this laptop to speed up my workflow or buy a new lens? crossover37 Pentax SLR Lens Discussion 26 09-24-2010 09:41 AM
What Happens To Tax Refund Checks... stevebrot Non-Pentax Cameras: Canon, Nikon, etc. 32 04-14-2010 08:54 PM
SIGMA 70-200mm f/2.8 II EX DG APO Macro HSM Lens for PENTAX:To buy or not to buy? thelittlecar Pentax SLR Lens Discussion 21 12-31-2009 06:01 AM
on DA * 16-50mm & QC checks... rkt Pentax SLR Lens Discussion 2 10-22-2009 06:23 AM
Holiday rebates: waiting for checks twinda1 Photographic Technique 2 04-24-2008 08:14 PM



All times are GMT -7. The time now is 07:44 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