How to get the lens apart to clear bits on the front element
Hi have recently purchased this lens from ebay second hand, and there appears to be sand or something inside.So i was wondering how easy it was to take it apart to blow this stuff out?.It is a pentax fit lens.
Re: How to get the lens apart to clear bits on the front...
The front element is easy to remove. There's a plastic cover on the front of the lens which has a very small hole in it. Get something like a very small screwdriver in that hole and prize the cover off. Remove the 3 screws in the next plastic cover and remove it. The next 3 screws you see hold the front lens element on. This whole part rotates to adjust the infinity focus and is kept in position by those 3 screws. Make sure you mark the position by maybe making a small scratch in the plastic next to one of the screws. Or maybe scratch around one of the screws. With those 3 screws removed the front element with the lens just falls out.
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Re: How to get the lens apart to clear bits on the front...
Unless you just happen to have a lens collimator handy to ensure that you've got the elements in parallel, I wouldn't even consider taking the lens apart. And, I suspect, if you have a lens collimator you wouldn't have asked this question.
Leave this job to a professional with the tools to put the lens back together again.
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Hi,IF I were you I will search the eBay for a same lens as " parts only " which means lens does not work but you can use the some parts of it ..There are a lot on ebay..one example is below URL..pls visit both.. Brand name services always do this..Since you were doing unauthorized repair ,they do not like it.. Hope this helps! Take care and please Remember to rate/vote and give me 4 Thumbs Up for me to continue for Helping out the Community :) Thanks ----------------- Item condition:For parts or not working
It sounds like the focus element inside the lens is stuck. This is usually either due to an impact knocking the elements out of alignment, or to sand/debris entering the focus motor's gear drive and preventing it from rotating. The buzzing sound you hear is the focus motor attempting to rotate, but buzzing up against some obstruction.
When the lens extends, you hear a buzzing sound, and then the lens retracts - this is usually the cause of the issue.
Unfortunately there is not much you can do externally to fix this problem. The camera will need to be taken apart and repaired by a professional or by the manufacturer.
You're going to have to take the camera into a camera shop to have the lens cleaned. There are special tools and other items that you need to have to take the lens apart and put it back together. I would phone around to different camera stores in your area to see what they would charge you to do the cleaning as it will probably vary quite a bit from shop to shop.
The "grit" is most likely between the two lens barrels and the more you use it the more damage it may cause. Cleaning and repacking/sealing a lens like this should not be attempted by people with out the proper equipment and knowledge. Basically if you take one of these modern auto focus lenses apart without the proper tools to realign and set the internal lens elements you have pretty well destroyed the lens. The Nikon 28-105 is a great lens and worth in my opinion the small amount of money to have a professional person service it.
hi ryan,well i would tig weld a steel rod dead centre of dent and try pull the dent back out,then cut the rod and smooth weld with a angle grinder with a sand disc on,you cant get a dent out fully if its big,but you will have it looking a bit better,or if it bothers you everytime you look at it buy a second hand one from ebay.
If the sand is in the zoom gears or auto focus gears then the camera would need to be disassembled to remove. Nice thing about this camera is that no soldering is required to take apart. A few small screwdrivers, and some tweezers would be all that is required. Canned air and a needle might also be helpful for removing the sand. If the camera just buzzes then I would say that the sand is in the auto focus gears (the stepper motor will buzz). If the auto focus lens is not fully retracted then the camera lens will not go back in (to prevent the auto focus lens from bumping against the shutter assembly)
Lens errors are fairly common. Usually it's sand or grit interfering with the lens extension mechanism. Or the camera's been dropped with the lens extended. Or the camera has been powered on, but the lens had been blocked preventing its extension. Or the battery ran down with the lens extended ...
Here's some things that you can do to try to correct it. They only seem to work for less than 50% of the lens errors, but if the camera is out of warranty, they're worth a try:
YOur camera is looking for verification that the lens is extending. Once it sees the lens has extended when you power on, the sensors in the lens tell the Operating system that the lens is Ok. If it does NOT see verification from the lens, it shuts down. Never force your lens back in. You may have to take the camera apart to reset the lens. you do this by removing the Zoom gear drive assembly and free you lens up by hand. 1 grain of sand or grit is like a Monkey Wrench in a Gear cog. Clear the obstruction with a can of compressed air, and work the lens with your hand. once you can that put it all back together and it should work.