How to check out used lens
Jun 17, 2013 17:09:18 #
rolf
Loc: Kenora Ont.Canada
Buying A Tamron 90mm F2.8 macro off a guy on Wednesday for my D3200.Anything special I should be doing?Will take a few shots and check how they look on my laptop.
Jun 17, 2013 17:19:21 #
You might want to bring a flashlight and shine the light thru the lens to look for fogging, dust, etc. I wouldn't expect any, but it never hurts to look.
Jun 17, 2013 17:24:40 #
Jun 17, 2013 17:33:48 #
rolf wrote:
Buying A Tamron 90mm F2.8 macro off a guy on Wednesday for my D3200.Anything special I should be doing?Will take a few shots and check how they look on my laptop.
besides looking for marks on the lens and fungus inside, bring your camera and a laptop (if possible) to not only that the lens is working but to make sure it's sharp, nothing worse than getting a soft copy.
Also make sure the rings turn smoothly.
Jun 18, 2013 08:09:35 #
Is this an older version?...Your camera requires lens models with built in focus motors in order to be able to AF with the camera. For macro shooting, you would want to focus manually anyway. The older AF Tamron macros (without a built in motor) will still meter even though they won't AF. The even older manual focus lenses will neither focus nor meter with your camera. They can still be used, but it takes a little more work to achieve images....Other than that, the info you received above is spot on...Take your camera with you & shoot some shots to check it out...Bear in mind though, that true macro lenses work different than other lenses. You need to move the camera to focus on the subject, & the subject will be very close. The amount of the image in sharp focus will be very slim also (this is assuming you have never used a true macro lens before)
Jun 18, 2013 10:17:00 #
Annie_Girl wrote:
besides looking for marks on the lens and fungus inside, bring your camera and a laptop (if possible) to not only that the lens is working but to make sure it's sharp, nothing worse than getting a soft copy.
Also make sure the rings turn smoothly.
Also make sure the rings turn smoothly.
What does fungi look like?
Jun 18, 2013 10:19:05 #
Gifted One wrote:
What does fungi look like?
Most times like "spiderwebs" growing inside the lens. Other times it can be small spots though.
Jun 18, 2013 10:24:13 #
Screamin Scott wrote:
Most times like "spiderwebs" growing inside the lens. Other times it can be small spots though.
ok, so dumb question....my lenses are new...but one day will be old...so, what do you do about it should they become that way? Is there anything that you can do? just wondering...if its to that point just toss them....or are they salvageable?
Jun 18, 2013 10:29:39 #
It depends on the extent of the fungus infection. Mild cases can be treated, but in extreme cases, the fungus will have etched the glass elements beyond repair. Fungus spores are everywhere. The best advice as to how to prevent it, is to store your lenses in a cool, dry place. Fungus needs moisture to grow. To prevent its growth, store the object at less than 65% humidity (major factor), and at a temperature of 19 - 23C (66 - 73F). Humidity is the very most important item
parkhurst6 wrote:
ok, so dumb question....my lenses are new...but one day will be old...so, what do you do about it should they become that way? Is there anything that you can do? just wondering...if its to that point just toss them....or are they salvageable?
Jun 18, 2013 10:31:52 #
parkhurst6 wrote:
ok, so dumb question....my lenses are new...but one day will be old...so, what do you do about it should they become that way? Is there anything that you can do? just wondering...if its to that point just toss them....or are they salvageable?
Someone posted a link here a couple of days ago showing a guy doing a test of a lens and the effects of dirt and scratches. Dirt had no effect, even when he went overboard with it. Then he put two scratches on the lens - no effect. He broke the front element - barely made a difference. Then he smashed the front element. That made a difference, but he still got usable pictures. DigitalRevTv did a similar test, destroying a Nikon and a Canon, yet they still took pictures.
Jun 18, 2013 10:38:14 #
I believe you are referring to a link I have posted several times...
http://kurtmunger.com/dirty_lens_articleid35.html
http://kurtmunger.com/dirty_lens_articleid35.html
jerryc41 wrote:
Someone posted a link here a couple of days ago showing a guy doing a test of a lens and the effects of dirt and scratches. Dirt had no effect, even when he went overboard with it. Then he put two scratches on the lens - no effect. He broke the front element - barely made a difference. Then he smashed the front element. That made a difference, but he still got usable pictures. DigitalRevTv did a similar test, destroying a Nikon and a Canon, yet they still took pictures.
Jun 18, 2013 13:04:37 #
Gifted One wrote:
What does fungi look like?
Refer to pic below. This is a crappy shot 'cause these spots are less than 1mm.
parkhurst6 wrote:
what do you do about it should they become that way? Is there anything that you can do?
Now don't laugh at this, but my limited research found several sources that say the best cure is to buy your lenses a tanning bed session, where the UV will kill and vaporize the fungus.
Ewwwww... Fungi!
Jun 18, 2013 13:59:25 #
well, I didnt laugh...and why would I? Your helping me and others in something we know little or nothing about! Thank you for going through the trouble to post back about it! ;) I know little reguarding that subject...in fact....a lot of camera talk...now ask me about medical stuff...being a mother, a grandmother...books or literature.....lol...I use this as a hobby. I love the outdoors...so No...I would never laugh! In fact, its a great idea!
Heres my link...you can see what I do for fun...
http://www.flickr.com/photos/96998048@N05/
Heres my link...you can see what I do for fun...
http://www.flickr.com/photos/96998048@N05/
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