What are the major risks buying used lenses ?

i just bought my first dslr,  and i was wondering what are the major risks buying used lenses ?

You need to be able to inspect and test the lens.
Look for obvious signs of physical damage, drops, etc. (cracks, dents, etc.)  A lens normally will get some signs of wear but as it's a used lens, you expect *some* wear... you're really looking for signs of damage.
Remove both front and rear caps.  Look through the lens into a bright no-contrast background (a white wall, a blue sky, etc.) and check the optics.  You're looking for signs of mold growth or damage to coatings.  Minor dust on internal optics wont impact the lens performance... so while you wouldn't want major amounts of dirt... don't worry too much about minor bits of dust (I've actually helped prove this to someone by clipping a 3M PostIt note down to a tiny 1/4" x 1/4" size and sticking it on the front glass.  Take a photo... nothing shows in the photo (even a piece of "dirt" that big wont show because the camera cannot focus on anything that close to the lens.)  
Rotate the focus ring from end to end.  You should feel a smooth and consistent amount of friction as you rotate the focus ring.  There should be no rough spots.  Listen to the lens as you do this... there should be no grinding noises.
Do the same with the zoom ring but in addition to checking for smooth consistent performance (no sticky or rough spots) you're also checking to make sure nothing seems excessively worn (nothing wobbles loose... very heavily used lenses can do that after enough wear.)
Connect the lens to the camera and make sure the camera can completely operate the auto-focus motors without a problem and/or if it's an image stabilized lens that the IS components are working.
Set the camera to max aperture (e.g. f/22, f/32.. depending on the lens) and press your camera's "depth of field preview" button (if you don't know which button is your DOF preview, check your manual.  Canon tends to move that one around a bit but it's almost always on the front side of the camera near the lens mount.)  You want to press and release it a few times.  This will cause the lens aperture blades to stop down to the aperture you set.  Release... do this while watching the lens.  You should see the aperture blades move in and out (well... they snap in and out very quickly).  You want to make sure it works ok, the camera gets no error codes, and there's no signs that anything is sticking.
And then there is the focus test... 
Focus the camera preferably at a FLAT surface that has lots of detail.... such as the brick wall of a building.  Make sure the camera is level and that the camera's focal plane is parallel to the plane of the wall.  Take a test photo at low f-stop and inspect.  You're checking to verify that the focus works and that the focus is reasonable across the image.   As you inspect from left ot right and top to bottom you are looking to make sure the focus is more or less equal (if the right side of the image is focused... but the left side of the image is soft... it would indicate that lens elements are skewed (lens isn't collimated).  It's difficult for a lens to get into this situation unless it was dropped and you'd probably see signs of damage.  
Tim Campbell
5D II, 5D III, 60Da

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    http://myweb.dal.ca/hchinni/sap/bdc_home.htm
    https://www.sdn.sap.com/irj/sdn/wiki?path=/display/home/bdc&
    http://www.sap-img.com/abap/learning-bdc-programming.htm
    http://www.sapdevelopment.co.uk/bdc/bdchome.htm
    http://www.sap-img.com/abap/difference-between-batch-input-and-call-transaction-in-bdc.htm
    http://help.sap.com/saphelp_47x200/helpdata/en/69/c250684ba111d189750000e8322d00/frameset.htm
    http://www.sapbrain.com/TUTORIALS/TECHNICAL/BDC_tutorial.html
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    http://www.sap-img.com/abap/difference-between-batch-input-and-call-transaction-in-bdc.htm
    http://www.sap-img.com/abap/question-about-bdc-program.htm
    http://www.itcserver.com/blog/2006/06/30/batch-input-vs-call-transaction/
    http://www.planetsap.com/bdc_main_page.htm
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    null

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    Please share this valuable information.
    Is there still any version is in progress from Oracle, which is yet to be officially launched from oracle?

    what are the major changes in these two product/tool wise? Few major changes to enlist are that SOA suite 10g was using Oracle Application Server (OC4J) however 11g is on Weblogic and 11g is based on SCA. B2B is now part of SOA suite itself and OSB can share a domain with SOA. You may refer below link to know few more -
    http://blogs.oracle.com/soabpm/2010/03/11gr1_patchset_2_111130_soa_fe.html
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    http://download.oracle.com/docs/cd/E14571_01/relnotes.1111/e10132/osb.htm#CJACHEHJ
    Is there still any version is in progress from Oracle, which is yet to be officially launched from oracle?No major release is planned. Patches for 11g R1 may come.
    Regards,
    Anuj

  • Hi, my name is Laith I'm from Iraq I just want to know what are the steps for buying a new iphone 5 from apple store and how to ship it to Iraq ???? and I would be grateful for you

    hi, my name is Laith I'm from Iraq I just want to know what are the steps for buying a new iphone 5 from apple store and how to ship it to Iraq ???? and I would be grateful for you

    Legality aside (I'm not a lawyer and have no opinion on the matter) in order to make a purchase of an iPhone 5 you would need to travel to a country where they are for sale and purchase it there. Be sure to get one that is officially unlocked or you would not be able to use it with your cell carrier. Be sure that your carrier supports use of the iPhone before you buy. Also note that the warranty of the iPhone is only valid in the country of purchase.
    Appe does not ship outside of the countries where it sells the phones.

  • What are the security risks for opening port 80 on workstations?

    Hello all,
    in our environment, there is an application which open port 80 on workstations when installed, but it is not allowed on preimeter FW
    could you please advise what are the security risks for leaving port 80 opened on the workstations? or it is considered secure unless it is not allowed on the preimeter FW?
    thanks alot & regards

    Hi R.Naguib.
    The 80 port is open by default through the firewall on Windows system, it is used by a http protocol by a browser.
    As for the network or hardware Firewall settings, I suggest to turn to the network administrator for details.
    Regards
    Wade Liu
    TechNet Community Support

  • What are the transaction codes we use for LSMW in MM, SD, PP  & FI/CO gnrly

    Hi all,
    What are the transaction codes we use for LSMW in MM, SD, PP  & FI/CO generally?
    Help will be surely rewarded.
    Thanks and Regards,
    Creasy

    > What are the transaction codes we use for LSMW in MM, SD, PP  & FI/CO generally?
    General threads about LSMW in MM, SD, PP, FICO will be locked and deleted generally.
    > Help will be surely rewarded.
    &********************** Please read "the rules" if found usefull... ************************&
    Cheers,
    Julius

  • What are the benefits of buying an iPad 2 with wi-fi, or with 3G when I already have an iPhone 4 with 3G?  My plan with was to go for wi-fi and connect to the internet through my iPhone 4.  Am I missing out on anything by not getting 3G?

    What are the benefits of buying an iPad 2 with wi-fi, or with 3G when I already have an iPhone 4 with 3G?  My plan with was to go for wi-fi and connect to the internet through my iPhone 4.  Am I missing out on anything by not getting 3G?

    James9901 wrote:
    I tried the tethering and hated it. The connection breaks every time I get > 25 feet from it and it's a pain to reestablish the connection. I suppose if I had to choose between breaking connections every now and then or paying another $100 + $25/month I'd do the tethering.
    Or just carrying the phone in your pocket? Just saying.....

  • What are the major differences b/w R/3 4.7 and ECC 6.0 with SAP BW/BI

    Hi,
    Any one can give an idea about the conversions from SAP R/3 to ECC 6.0 with respective of SAP BI/BW.
    what are the major differences loading the data,delta methods,enhancements,lo's,FI-SL,CO-PA etc.....
    if any one have documents and links please can you share it is very usefull for my client.
    with out knowing i don't want to go forward,i don't misguide my client.
    actually i am working as sap bw/bi consultant,my client is going to upgrade the R/3 4.7 to ECC6.0 and BW 3.5 to BI 7.0.can you help me or guide me .
    Thanks in advance.
    SAP Member......

    Check
    http://service.sap.com/releasenotes
    http://erp.fmpmedia.com/
    Markus

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