Question about Tamron 18-250mm F/3.5-6.3 AF Di-II LD Aspherical (IF) Macro Lens for Konica Minolta and Sony Alpha D...

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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.

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  • kakima May 11, 2010

    Taking a lens apart is not that hard, you shouldn't need much more than a set of small screwdrivers. Putting one back together is a totally different matter...
    Do you have a lens collimator? Without one, you're not going to be able to make sure the lens elements are properly aligned.


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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.

Posted on Feb 06, 2013

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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.

Posted on Feb 05, 2010

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Please Help. I have a Nikon 18-200mm f/3.5-5.6 G ED-IF AF-S VR DX. I occasionally remove the front lens element assembly to clean the inner lens element as it gets dusty. The front lens element assembly...

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 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 :)

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Nikon 28-105mm lens works okay but the focus feels "gritty" as if there is a little bit of sand in the gears. My concern is that it is on the verge of breaking and becoming unusable. Is the focus...

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.

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Hi, I have a 85/2.8 Sonnar. It has a spot of dirt behind the front lens. How do I open this one up to clean it? Thanks, Bart, Amsterdam

Normally I would advise against opening up a lens to clean it. You are likely to get more dust in than you get out, and it can be extremely difficult to get the bits back together again. However, if all you want to do is remove the front element, without disturbing the aperture mechanism and complex stuff at the back of the lens, then it is pretty straight-forward.

The front element (probably two or more pieces of glass cemented together) is held in place by a retaining ring that can be unscrewed. Often this ring will have two little slots on opposite sides of the lens with which to grip the ring and unscrew it. You won't have a suitable tool for this around the house, so will have to make or improvise. I have got away with using the points of the blades of a pair of scissors, but take great care, as a single slip will put a scratch across the camera lens that is much more serious than a bit of dirt. Sometimes the ring (at least the outer one, which is merely a cosmetic cover) can be shifted with a jeweller's screwdriver in just one of the slots, pushed around the circumference with your thumb. If it has no slots, you can often grip it with a disk of rubber cut from a bike innertube. This may expose a further, more businesslike retaining ring that actually holds the element in place, which you treat in the same way.

Except that I have been disassembling an old lens as I write this, and while struggling with the second ring, the glass of the front element just fell out and landed on the floor. Apparently the second ring holds something else. Oh, dear. At least it didn't break. I expect I may have disturbed the fine tuning of the focus by shifting the second ring, but I would never do this with a lens that was worth anything.

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Hi there,
I recommend to call Barry Edmonds Nikon technician at Fixation UK LTD
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Spot on front element of Kiron 80-200mm f/4.5 zoom.

Kiron lenses had some unusual designs- doesn't have a thread ring holding the lens element in does it? As I remeber you had to almost completely disassemble the lens to get at that front element. FYI, the closer the spot is to the "optical center" of the lens, the less likely it is to have much effect on picture quality, EXCEPT if you shoot lots of bright objects, so you might just live with it

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Scratched front lens element

Well, you cannot buy the front element by itself. The whole front optic set comes as a unit. You can call Canon USA, ask for parts,

The part number you are inquiring on is: CY1-2800

Have you taking any pictures with the lens? usually it takes quite a bit of damage to effect images. The rear optics are the more sensitive glass on all lenses

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Side out of image

I'm assuming in what follows that you've tried other lenses and only get the problem with this one lens. If you haven't, then it's essential to do this first unless the lens is obviously the problem. If it happens with other lenses then you have a damaged image sensor mounting within the camera body which will need professional attention.

This is a common problem on this particular lens. Normally it's due to the front element of the lens being slightly skewed on the lens barrel and most commonly occurs after the lens has been dropped.

Turn your lens to manual focus and focus to the shortest distance. Set the lens upright on a table and carefully view all around, if the problem is the front element it will lean slightly to one side like a miniature leaning tower of Pisa. If it doesn't, then check again with greater precision using a ruler to measure the distance s between the lens barrel and the focussing ring and a number of opposite points around the circumference. If they're anything but identical then the lens is skewed. If they are identical then the skewed element is buried deep inside the lens and will need professional repair as it's most likely a fault with the moving element used for image stabilisation.

If the tests confirm that the front element is skewed then if you're really careful and lucky you can often jiggle the front element using a firm twisting action back into place. It does take a bit of judiciously applied brute force and if unsuccessful you can make the problem worse, but either way if you don't try then the lens needs professional repair and new internal parts.

I've had this problem on about one of these lenses every month or so for the last year. The brute force repair works in about half the lenses I try it on and normally lasts. On the others a strip down repair usually shows the same range of broken/worn parts as I find on those lenses which clearly are too far gone to attempt the brute force method.

The difference is cost: the brute force repair costs nothing. The proper repair is often economically unviable as it often costs 50% to 70% of the cost of a brand new lens with a warranty.

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