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#1
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Vivitar Series One 90-180/4.5 K-mount lens
I received my new Pentax K10D today. The main reason I got it is because I
have some excellent manual focus lenses that I wanted to use on it. One of those is a Vivitar Series One 90-180/4.5 K-mount lens--an extraordinary lens. Unfortunately, there is a metal collar that partially surrounds the rear element that prevents the lens from mounting on the camera. The other K-mount lenses I have mount without difficulty. Has anyone had any experience with this problem. If I could get the collar off the lens and could grind it down, I believe the lens would fit but I am not sure how to do this (it would be too risky to try to do this with collar mounted because it is so close to the rear element. Any help would be appreciated. Thanks |
#2
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Vivitar Series One 90-180/4.5 K-mount lens
David Goldstein wrote:
I received my new Pentax K10D today. The main reason I got it is because I have some excellent manual focus lenses that I wanted to use on it. One of those is a Vivitar Series One 90-180/4.5 K-mount lens--an extraordinary lens. Unfortunately, there is a metal collar that partially surrounds the rear element that prevents the lens from mounting on the camera. The other K-mount lenses I have mount without difficulty. Has anyone had any experience with this problem. If I could get the collar off the lens and could grind it down, I believe the lens would fit but I am not sure how to do this (it would be too risky to try to do this with collar mounted because it is so close to the rear element. Any help would be appreciated. Thanks Before doing radical surgery that would minimally damage the resale value and worse, damage the lens, ask yourself what is the main use of this lens? It's a flat field variable focal length macro lens. Do you use this lens at infinite focus a lot? I've found that it is prone to flare (Olympus OM mount) and don't use it a lot as a short telephoto. I use it for macro work. I'd put a short extension tube on it and see if it works for your needs. That would eliminate the ability for infinity focus though. I did have to do minor surgery on my lens, one of the mounting screws is positioned in a way that can damage an OM4 mount reset button, so I filled in that one point with epoxy. But that's about as far as I would go for "surgery" on this lens. One thing about the lens, it does give the biceps a workout! JD |
#3
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Vivitar Series One 90-180/4.5 K-mount lens - thank you
Thank you, thank you. Your solution was so elegantly simple that I am
kicking myself for not thinking of it. My main if not sole use of the lens is for macro work so the loss of the ability to focus to infinity is a small price to pay. I have a set of extension tubes and your suggestion worked like a charm even with the shortest tube David Goldstein "JD" wrote in message . .. David Goldstein wrote: I received my new Pentax K10D today. The main reason I got it is because I have some excellent manual focus lenses that I wanted to use on it. One of those is a Vivitar Series One 90-180/4.5 K-mount lens--an extraordinary lens. Unfortunately, there is a metal collar that partially surrounds the rear element that prevents the lens from mounting on the camera. The other K-mount lenses I have mount without difficulty. Has anyone had any experience with this problem. If I could get the collar off the lens and could grind it down, I believe the lens would fit but I am not sure how to do this (it would be too risky to try to do this with collar mounted because it is so close to the rear element. Any help would be appreciated. Thanks Before doing radical surgery that would minimally damage the resale value and worse, damage the lens, ask yourself what is the main use of this lens? It's a flat field variable focal length macro lens. Do you use this lens at infinite focus a lot? I've found that it is prone to flare (Olympus OM mount) and don't use it a lot as a short telephoto. I use it for macro work. I'd put a short extension tube on it and see if it works for your needs. That would eliminate the ability for infinity focus though. I did have to do minor surgery on my lens, one of the mounting screws is positioned in a way that can damage an OM4 mount reset button, so I filled in that one point with epoxy. But that's about as far as I would go for "surgery" on this lens. One thing about the lens, it does give the biceps a workout! JD |
#4
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Vivitar Series One 90-180/4.5 K-mount lens - thank you
David Goldstein wrote:
Thank you, thank you. Your solution was so elegantly simple that I am kicking myself for not thinking of it. My main if not sole use of the lens is for macro work so the loss of the ability to focus to infinity is a small price to pay. I have a set of extension tubes and your suggestion worked like a charm even with the shortest tube David Goldstein "JD" wrote in message . .. David Goldstein wrote: I received my new Pentax K10D today. The main reason I got it is because I have some excellent manual focus lenses that I wanted to use on it. One of those is a Vivitar Series One 90-180/4.5 K-mount lens--an extraordinary lens. Unfortunately, there is a metal collar that partially surrounds the rear element that prevents the lens from mounting on the camera. The other K-mount lenses I have mount without difficulty. Has anyone had any experience with this problem. If I could get the collar off the lens and could grind it down, I believe the lens would fit but I am not sure how to do this (it would be too risky to try to do this with collar mounted because it is so close to the rear element. Any help would be appreciated. Thanks Before doing radical surgery that would minimally damage the resale value and worse, damage the lens, ask yourself what is the main use of this lens? It's a flat field variable focal length macro lens. Do you use this lens at infinite focus a lot? I've found that it is prone to flare (Olympus OM mount) and don't use it a lot as a short telephoto. I use it for macro work. I'd put a short extension tube on it and see if it works for your needs. That would eliminate the ability for infinity focus though. I did have to do minor surgery on my lens, one of the mounting screws is positioned in a way that can damage an OM4 mount reset button, so I filled in that one point with epoxy. But that's about as far as I would go for "surgery" on this lens. One thing about the lens, it does give the biceps a workout! JD Glad it works for you. I forgot to mention that whenever you put an extension on a zoom, you lose the constant focus capability. But that just makes this Vivitar like a Vivitar 28-90 - a varifocal lens. Now go shoot some bugs. JD |
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