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Add on tele and wide angle convertors
Assorted lenses added to the front of other lenses...
Part of our series of brief lens tests, using various lenses we found laying around the office...
Add on lenses were a popular adjunct for some cameras in the past (cine and still) where the standard lens was fixed (whether zoom or fixed focal length.
Keith has acquired several of these impressive looking bits of glass over the years, and decided to see if they were any good for anything more than seeing what would attach to what.
Sometimes it's fun just trying to take some photos with the limitations of a particular lens - sometimes I'm just curious as to how much better modern lenses have become and need reminding why I spend so much on lenses for our business here at Northlight ;-)
Many older lenses can be fitted to your DSLR with a simple adapter. Canon users have a bonus here in that the distance from the mount to the sensor is relatively short, making for easier mechanical design of adapters, such as the Olympus OM mount to Canon EF mount adapter you can see on two of the lenses I've used here.
The bits of glass...
The 1.5x and 1.3x adapters at the back and right are called 'Tele Converters', and were originally for cine cameras.
The 1.4x TCON-14B and 0.8x WCON-08B were supplied with the Olympus E-20 digital camera. The smaller 0.8 converter came with an Olympus C-1400XL camera.
The left most lens shows the most obvious coatings, whilst the older Chinon and Sankyo lenses have fairly minimal coatings by today's standards (modern lenses really are vastly better in this respect compared to those lenses from the 1980's you find in junk shops.
Just one other thing you'll likely need - a set of filter adapter rings
Ideally just one ring should cover what you need, since to avoid vignetting, the convertor should be as close to the front of your lens as possible. The rear lens element of the convertor ideally needs to be large enough to cover the field of view.
The 49-62mm step ring worked for the the Olympus convertors with the Zuiko 24mm f/2.8 and 50mm f1.2 lenses I tried.
The back of the Chinon glass has a 58mm thread - I'm going to put adapters on it (mouse over image to see)
Adding the lens hood for good measure.
This gives this, when attached to my Canon 1Ds (The sample photos in the article are taken with my 1Ds mk3, but my old 1Ds is doing some modelling work)
And oh yes, this most definitely gets noticed when you go out with it :-)
This is ~65mm at f/1.2 at my local pastry and coffee shop...
There is minuscule depth of field, noticeable field curvature, massive chromatic aberration, blurring etc., etc.
More so with this view of a pollarded lime tree against the winter sky
A man in an orange car.
Here's some more of the set-ups I tried.
A longer tele converter. Note the revised focus scale (this device was for a movie camera)
A wide angle converter on the Zuiko 24mm (a good lens - see this look at the 24mm on the 1Ds3)
And the newer Olympus 'Wide extension Lens pro'
The 1.4x converter on the TS-E90mm - so I've got a 126mm tilt/shift lens...
A very large shift lens - TS-E90+Chinon adapter (phone photo!)
Using the rather wide f/1.2 setting is always going to be tricky
If you mouse over the image below, you can see (even in this reduced size image) the effect of 'fixing' the chromatic aberration in Photoshop ACR (the settings are almost off the scale BTW)
And wider lenses too
Here's what you get with the WCON-08B attached to the 24mm lens (19mm) - at f/2.8 lots of vignetting and blur.
At f/11 everything has sharpened up a lot
The longer TC worked fine on the TS-E 90mm, but with increased aberrations - enough that if I needed to tilt a lens at this focal length, I'd use a Canon 1.4x teleconverter between the TS-E90 and body.
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Interesting effects, but hardly items to go in my camera bag on most jobs I work on.
I will admit that the Chinon converter on the Zuiko 50/1.2 makes for some interesting effects - something to file away 'just in case'.
One side benefit of using lenses on the front of of others is that you don't get the loss of light through an effective loss of one stop of aperture, of course you get distortion and lots of other effect, but that might not matter.
I've never been a fan of using bad cameras just for the sake of it - sure, I can find it fun to go out and take some shots with one of these lens combinations, and just see what turns up.
That's fine but what am I going to do with such images - probably not a lot - and no, I'm not an instagram fan either.
I didn't have one at hand, but I'd be interested to see how the converters perform on the standard 'kit lenses' you get on some DSLRs.
My suspicion is that with slower lenses, with smaller front elements, the distortions that I've highlighted would be much more under control.
Interesting experiment for altering the look you get from lenses - if you find one of these teleconverters in a junk shop somewhere, well worth the few quid they can go for.
Here's the rest of my optical 'junk' drawer BTW
Just remember that (IMHO) it's about actually taking photos not just the techy stuff ;-)
The views in this article represent those of Keith Cooper.
Keith is always happy to discuss matters raised in his articles. You can Email Us
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