Where to mount macro extension tubes for legacy lens

GShooter

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I am using an OM fit macro lens with my E-M10. I want to use an extension tube for extra magnification. Would it be better to mount an M4/3 tube to the camera body and then the lens adapter,or to mount an OM tube directly between the lens and the lens adapter? Provided of course that I can find a set of OM macro tubes. I have full aperture and focus control on the lens and so would not need tubes with electrical connections.
 

mattia

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I'd mount OM tubes to the lens adapter - they're pretty easy to find on eBay.

However, I'm curious - a *Canon* lens with an *Olympus OM* mount?? Never heard of such a thing, and google's not helping. Details?
 

OzRay

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OM bellows have been readily available, but it might be harder to find macro tubes. I'd suggest mounting everything after (or before, depending on how you view it) the m4/3 adapter, basically, go from big to small.
 

fredlong

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Functionally it doesn't matter so use whatever you can get. However, if you might want to use native lenses extended, then a set of u43 tubes with the electrical connections from Amazon runs about $50-60 in the US. Maybe differently priced in the UK. Native tubes will also allow you to use any adapted lens.

Fred
 

Turbofrog

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Functionally it doesn't matter so use whatever you can get. However, if you might want to use native lenses extended, then a set of u43 tubes with the electrical connections from Amazon runs about $50-60 in the US. Maybe differently priced in the UK. Native tubes will also allow you to use any adapted lens.

Fred
I wholeheartedly agree with this suggestion.

The question is whether you ever intend to use any other lens as a macro, native or adapted. If you have native tubes, then it's no problem. If you have specific mount tubes, then you need a different set for each lens, which could end up costing more (and certainly being more hassle) than simply having a native M4/3 set.
 

GShooter

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I'd mount OM tubes to the lens adapter - they're pretty easy to find on eBay.

However, I'm curious - a *Canon* lens with an *Olympus OM* mount?? Never heard of such a thing, and google's not helping. Details?
The lens to which I am referring is a Cosina 100mm Macro with Canon OM mount
 

GShooter

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I stand corrected. It is Olympus OM. I have ordered a set of Olympus Triplus OM Macro tubes on ebay, so it will be Lens, macro extension tube. adapter, camera body. Many thanks to everyone for the advice.

David
 

RDM

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I am using a canon OM fit macro lens with my E-M10......
I stand corrected. It is Olympus OM. I have ordered a set of Olympus Triplus OM Macro tubes on ebay, so it will be Lens, macro extension tube. adapter, camera body. Many thanks to everyone for the advice.

David
I know in the later post, you corrected yourself regarding the brand of lens you are using, but you can & should go back to your original post and click the edit button and correct it there too.


Functionally it doesn't matter so use whatever you can get. However, if you might want to use native lenses extended, then a set of u43 tubes with the electrical connections from Amazon runs about $50-60 in the US. Maybe differently priced in the UK. Native tubes will also allow you to use any adapted lens.

Fred
I wholeheartedly agree with this suggestion.

The question is whether you ever intend to use any other lens as a macro, native or adapted. If you have native tubes, then it's no problem. If you have specific mount tubes, then you need a different set for each lens, which could end up costing more (and certainly being more hassle) than simply having a native M4/3 set.

Also I agree that the electronic µ4/3 extension tubes are very inexpensive and the best choice for you, that way you can use native lenses too. However if they are still too expensive for your budget then I would not have wasted money on OM macro tubes, unless you have an OM film camera that you would use also; I would have just purchased the Cheap µ4/3 extension tubes which would cost the same if not less than OM extensions. This way if you get more legacy lenses in other mounts (like so many of us legacy users end up doing) you can extend them too.


P.S. A photograph of the lens, or the lens on the camera would be nice too ..
:smile: we love Classic lens/camera porn on this Board.
 

Petrochemist

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A couple of point's consider:
Adapted lenses will typically have longer focal lengths than native lenses so will see less change from any given extension. Because of this OM and other older tubes will usually be in longer lengths than µ4/3 ones.

There are now a range of µ4/3 to M42 adapters that include a helicoid giving variable length extension tubes. With a little ingenuity it should be possible to adapt the M42 part to give an OM mount instead. (I've done something similar going to PK mount with a jury rigged M42 body to PK lens adapter)
 

OzRay

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Longer focal lengths for macro isn't an issue, it's actually a bonus, as it gives you greater working distance. The greater working distance means that you are less likely to disturb your subject, it allows you space for lighting should you need to add extra, you can have more room to move around and place your gear, and it allows be better background separation in messy situations. Obviously if the subject is very small, then the longer focal lengths won't always work and you need a good tripod to eliminate movement, but for good macro work, you'd have the latter in mind anyway.
 

Petrochemist

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Longer focal lengths for macro isn't an issue, it's actually a bonus, as it gives you greater working distance. The greater working distance means that you are less likely to disturb your subject, it allows you space for lighting should you need to add extra, you can have more room to move around and place your gear, and it allows be better background separation in messy situations. Obviously if the subject is very small, then the longer focal lengths won't always work and you need a good tripod to eliminate movement, but for good macro work, you'd have the latter in mind anyway.
Extra working room is certainly a huge benefit. The issue is longer focal lengths need more extension to get a given magnification. Using µ4/3 tubes with a legacy lens will typically give fairly minimal enlargement, as they are designed for the shorter focal length lenses commonly used on smaller sensors. Legacy tubes are typically designed for ~50mm focal length rather than ~25mm and so are longer than the native ones.
 

OzRay

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Extra working room is certainly a huge benefit. The issue is longer focal lengths need more extension to get a given magnification. Using µ4/3 tubes with a legacy lens will typically give fairly minimal enlargement, as they are designed for the shorter focal length lenses commonly used on smaller sensors. Legacy tubes are typically designed for ~50mm focal length rather than ~25mm and so are longer than the native ones.
Legacy lenses, especially long focal length work fine. This shot (which I did post elsewhere) was taken with a Nikon 300mm f4, Olympus EX-25 extension tube and E-1:

Subscribe to see EXIF info for this image (if available)


I could not have even gotten to the butterfly if I'd had a shorter lens, let alone not disturbed the butterfly, which wasn't that large.
 

dadadude

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Dang! I have a set of OM tubes I could have given you free. I got them in a bundle and have no need for them.
 
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