I have a Minolta Rokkor-x 200mm telephoto lens with fungus
I have a Minolta Rokkor-x 200mm telephoto lens with what looks like fungus inside. It's white and appears to be cloudy spots along one of the inner rings as you look through the far end or ouside of the barrel and look in. I heard the mildew leaves permanent damage so I don't know how far gone this is. I never really inspected the lens before and had it a number of years. Is it relatively cheap to have someone clean it or could I do it myself? How much would it cost if I had it done?
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Re: I have a Minolta Rokkor-x 200mm telephoto lens with...
Lens fungus is really common and it's not cost effective to repair. Even if the fungus is removed then the multicoatings are permanently damaged.
The good news is that until the fungus becomes pretty severe the image quality doesn't suffer much as most photos use the lens stopped down to some extent and this means that if the centre of the lens is clear then there's nothing to block the light paths.
Unfortunately it does tend to spread, so keep affected lenses in a separate camera bag to the rest and if you can afford to do so then throw them away and replace your camera bag as it will be loaded with microscopic spores waiting to attack more lenses. Making sure that your camera and lenses are completely dry and free of condensation before storing them until next used will prevent reoccurence.
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Whatever you do, do not open the lens. You will never be able to reassemble it. If the fungus is adversely affecting your images, you need to take it to a qualified camera repair man or send it to a Nikon repair depot found on the Nikon website. If it is not affecting your pictures, I would just live with it.
If you realy have fungus in your zoom lens, you can't do anything. If it does not show on the pictures, just keep the lens dry. (use silica gel) If you want it it be repaired, it will cost more than an new lens.
You just need any Minolta AF mount lens. Sony Alpha lenses also physically fit as Sony inherited the Minolta lens mount when they bought the company, but as they are a later development not all will be electronically compatible.
The size of the lens depends upon the focal length of the lens and you choose that according to how wide a field of view you desire. Typical lenses are 28 and 35mm wide angles, 50mm "standard" (approximately the same perspective of how the human eyeball sees images), 70 to 90mm short telephoto lenses (a narrower perspective and very good for portraits) and higher numbers are narrower perspective telephoto lenses for viewing increasingly distant objects. In practice, the available lenses will be incorporated into zoom lenses which incorporate a seamless range of focal lengths within one single model. The word "zoom" reflects the fact that you can seamlessly change from say 28mm wide angle through to 80mm short telephoto and every single setting between them
Any zoom which starts at less than 50mm and finishes in the short telephoto range is called a standard zoom and is the lens that most autofocus cameras were supplied with. The next most common size will be something like a 70-200mm which is a telephoto zoom (or tele zoom) and takes you from a portrait lens to a genuine 5x magnification telephoto. You may also find so-called "super zooms" which do the whole job on one, for example 28-200mm. but the more jobs a single lens tries to do, the bigger and bulkier it becomes and the image quality deteriorates due to poorer contrast and greater image distortion at each end of the zoom range.
This is not an exhaustive answer, as there are entire books on the subject, but hopefully it's been of help to you.
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It depends entirely upon what you're after and the type of photography you wish to undertake.
Any Minolta AF mount lens will fit. 28mm is a standard wide angle, 50mm is a standard lens with a field of view approximately the same as the human eye, 80mm is a slight telephoto and for distant subjects 200mm is a long telephoto. Some lenses combine a few into one, they're called zoom lenses and will typically be something like 35-70mm, or 70-200mm. The measurements relate to the focal length of the lens, but generally the larger the number the longer the lens sticks out at the front. Zoom lenses are bulkier and heavier than fixed focal length lenses, but they're also the most commonly used types these days.
It is lens fungus and you're correct in your assumption that it's uneconomical to professionally repair on your lenses. But it need to be pretty bad before it affects image quality so don't junk them just yet.
Some types of lens fungus can be killed simply by leaving the lens out in sunlight, but I'd suggest that it's better to leave them exposed to the indirect sunlight on a bright overcast day to prevent any chance of sharply focussed light burning the inside of the lens. Killing the fungus won't remove the dead stuff but it prevents the problem getting worse.
i have got the same problem my friend and i have just recieved an email telling me to put lens in my camera bag with 2 packs of Silicone gel and the fungus will be taken care of ,if this is not interfering with pics dont be to concerned.