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Accessory talk Those important extra system components.

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Old 20th April 2011
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Cheapo manual extension tubes



Taken using an Olympus E-30 DSLR and 55mm manual extension tubes with an OM Zuiko 50mm f/1.4 lens, plus Olympus STF-22 twin flash set, attached to the lens using a 49-72mm stepping ring. The frame width covers 12.5mm, making the reproduction just under 150% life size. Compared to life size on full frame, the coverage is equivalent to 288%. This shot of the 1 coin has been cropped about 5% for framing purposes.

Here's an un-cropped frame of a section of tape measure:



That's millimetres across the bottom, by the way.

It has to be said that the subject is just an inch or so from the end of the lens, which isn't ideal.

Ian
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Old 21st April 2011
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Re: Cheapo manual extension tubes

I used an 8 set of manual tubes from eBay for this, coupled to an OM 50mm f/1.4 standard lens. As manual control of the aperture is required with these extension tubes I'm wondering if I should consider a better legacy lens for extreme macro work. Does anyone have any suggestions?

My main issues with the 50 1.4 is that the subject is extremely close to the lens and sharpness around the periphery of the frame is not great. Also the lens only goes to f/16.

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Old 21st April 2011
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Re: Cheapo manual extension tubes

Quote:
Originally Posted by Ian View Post
I used an 8 set of manual tubes from eBay for this, coupled to an OM 50mm f/1.4 standard lens. As manual control of the aperture is required with these extension tubes I'm wondering if I should consider a better legacy lens for extreme macro work. Does anyone have any suggestions?

My main issues with the 50 1.4 is that the subject is extremely close to the lens and sharpness around the periphery of the frame is not great. Also the lens only goes to f/16.

Ian
I have said this on occasions where I have used the lenses reversed on the cheapo extension tubes. Here are a couple of samples of a metric ruler using an OM 28mm lens reversed on the generic cheap set of extension tubes & the resulting image shows 4.5mm across the frame. This also gives a constant working distance of aproximtely 2" which requires very careful holding by hand (as below) or focussing rails. I used one diffused FL36R (RC) for lighting with the lens aperture at f8 & ISO 200..





Does this help at all?

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Old 21st April 2011
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Re: Cheapo manual extension tubes

A reversed lens is not ideal for me as I want to attach the STF-22 twin flash set and that requires a filter thread (to 67 or 72mm), but thanks for showing that

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  #5  
Old 21st April 2011
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Re: Cheapo manual extension tubes

I used to love my cheapo extension tubes and 50mm f1.8. That 1.4 is certainly living up to it's rumoured extra sharpness over the 1.8. I wish I hadnt let the tubes go with the E520 now.
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Old 21st April 2011
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Re: Cheapo manual extension tubes

Quote:
Originally Posted by Ian View Post
A reversed lens is not ideal for me as I want to attach the STF-22 twin flash set and that requires a filter thread (to 67 or 72mm), but thanks for showing that

Ian
I'm a fix it man & I don't like to be beat!

A suggestion that would allow you to reverse an OM lens would be to have the ebay generic OM to 4/3's adapter on the usual end for activating the aperture lever so the aperture ring will open & close the aperture, but be prepared to sacrifice that for normal use by filing a little (very little) off the outside diameter of the part that would normally lock into the camera body so it can be jammed into a step up ring from 49mm to whatever you want (to 67 or 72mm if that is what you need), as the inside diameter of the 49mm thread is approximately 46mm which is a bit too tight to go on the 4/3's adapter as it is. This will then allow a filter fitting attachment such as the twin flash head mounting ring to be attached. You could then leave that step up ring (49 to 67mm) permanently attached to that OM to 4/3's adapter for that dedicated purpose (a bit of super glue might be an added to be sure of not coming loose) & it is quite a cheap solution. I hope I have explained that without confusing you.

For reversing the lens, I bought the 58mm 4/3's reversing adapter with a 49mm to 58mm step up ring to use with it. At the time, some sizes weren't available, but that gave me the flexibility to reverse a larger filter sized lens if one was available.
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Old 21st April 2011
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Re: Cheapo manual extension tubes

I use the OM Bellows with the OM 80mm Bellows Macro. This gives excellent reproduction ratios, fantastic control with the focusing rack.

With the 24mm fitted, I have (for no good reason) taken a snap with the item touching the filter. The 80mm provides a good working length and allows the light in (natural or artificial)


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Old 21st April 2011
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Re: Cheapo manual extension tubes

I've just been looking on amazon at these tubes.
I assume the people moaning about them are trying to use them with digital kit lenses and thats why they can't get them to work (focus).

I assume they work fine with an OM lens & manual ??

By the way can anyone recommend a cheap bellows option
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Old 21st April 2011
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Re: Cheapo manual extension tubes

Are these any good?


Amazon Amazon




Amazon Amazon


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Old 22nd April 2011
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Re: Cheapo manual extension tubes

I actually attach one of these on the Sigma 150 macro lens for assisting focus only & they are a little weak in light power on shorter lenses for hand held shots.
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Last edited by Ian; 22nd April 2011 at 08:01 AM. Reason: Made image bigger
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Old 22nd April 2011
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Re: Cheapo manual extension tubes

Quote:
Originally Posted by Graham_of_Rainham View Post
I use the OM Bellows with the OM 80mm Bellows Macro. This gives excellent reproduction ratios, fantastic control with the focusing rack.

With the 24mm fitted, I have (for no good reason) taken a snap with the item touching the filter. The 80mm provides a good working length and allows the light in (natural or artificial)
On the other hand, other OM lenses can come quite cheap & can be effective if adapted suitably, hence the use of the cheap extension tubes.

I have used the 50 & 28mm lenses reversed on the Soligor Bellows (by Vivitar) with adapters because the working distance becomes too close facing forward.

I would still like to know Ian's response is to my suggestion for attaching the twin flash on the reversed OM lens. For a more permanent fixture, I would remove the inner thread (49mm) protusion on the step up ring & part of the 4/3's lens locking section protrusion of the OM to 4/3's adapter & use three countersunk screws to fix then together for a flush contact between them. The result would be an adapter of a female OM mount to female filter thread of desired size (e.g. 67mm).

Here are those items on ebay
http://cgi.ebay.com.au/Old-OM-Lens-O...item53e40e842e
http://cgi.ebay.com.au/49mm-67mm-Ste...item19bbaa566d

Another question I have for Ian. What is the minimum good working distance for the Oly twin flash?
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Last edited by Ross the fiddler; 22nd April 2011 at 05:39 AM. Reason: Added question for Ian.
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Old 25th April 2011
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Re: Cheapo manual extension tubes

Quote:
Originally Posted by Ross the fiddler View Post
On the other hand, other OM lenses can come quite cheap & can be effective if adapted suitably, hence the use of the cheap extension tubes.

I have used the 50 & 28mm lenses reversed on the Soligor Bellows (by Vivitar) with adapters because the working distance becomes too close facing forward.

I would still like to know Ian's response is to my suggestion for attaching the twin flash on the reversed OM lens. For a more permanent fixture, I would remove the inner thread (49mm) protusion on the step up ring & part of the 4/3's lens locking section protrusion of the OM to 4/3's adapter & use three countersunk screws to fix then together for a flush contact between them. The result would be an adapter of a female OM mount to female filter thread of desired size (e.g. 67mm).

Here are those items on ebay
http://cgi.ebay.com.au/Old-OM-Lens-O...item53e40e842e
http://cgi.ebay.com.au/49mm-67mm-Ste...item19bbaa566d

Another question I have for Ian. What is the minimum good working distance for the Oly twin flash?
Sorry for the late response - the twin flash angles can be adjusted until they are almost facing each other, so pretty near. Certainly down to an inch or two. The heads can also be moved around the ring independently, so you can have both on one side or one at the top and one opposite, etc.

Ian
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