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  #1  
Old 30th April 2016
Harold Gough Harold Gough is offline
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Laowa 15mm Shift Macro on Surrogate Body

The "surrogate" in the title comes from the concurrent discussion about the use of non-Olympus E images here.

The images below should have been shot on my EM-1. The lens arrived this week with adapters for m4/3 and Sony E. The lens seems to be designed for Canon (excuse language ) with adapters required for bodies with shorter registration distances.

I first attached the lens to my Sony Alpha A7R (full frame) via the Sony adapter. The images posted here are from the second session, having just missed the very closest focus in the first attempt. (It is many years since I used other than a telephoto, so lack of practice). Anyway, when it came to detaching the lens from the Sony adapter I couldn't turn it more than a few degrees after releasing the locking pin. It was exceptionally tight to attach but even more so to detach. I am in correspondence with the maker about this.

In the meantime, the subject is unlikely to be in good condition by the time the hitch is sorted. So, if you want to know what the EM-1 would do, just imagine a quarter of the width of the image cropped off all round, assuming the same working distance. (The last image is a crop of the one above it, giving some idea). The lens was very close to the subject (at a bit less than 1:1 and, this, a little further away that it might have been). The lighting (Nissin R "Air" TTL flash off-camera) was very difficult to get on the subject, let alone evenly .

The ISO was 400, the aperture f22 and the shutter speed 1/160 ( I usually use 1/250 on the EM-1. Manual mode was used and hand-held, with some hand support.

The subject is a half-hardy Pleione orchid, in this case a species, instead of the usual hybrid. This P. grandiflora variety 'Pink' has an unusually large flower but nothing like as large as this lens makes it look.

The background is deliberately somewhat cluttered, to show the DOF in these test shots.

Harold









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Old 30th April 2016
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Re: Laow 15mm Shift Macro on Surrogate Body

The images and the technical description are very good. It will be interesting to see just what you can get out of the lens.
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Old 30th April 2016
Harold Gough Harold Gough is offline
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Re: Laow 15mm Shift Macro on Surrogate Body

Quote:
Originally Posted by Graham_of_Rainham View Post
The images and the technical description are very good. It will be interesting to see just what you can get out of the lens.
Thanks, Graham.

I was inspired by the work of John Brackenbury:

http://images.sciencesource.com/feat...focus=280&pf=1

I believe he used a 4mm lens and focus stacking. I am working towards single frame images of a similar nature.

Harold
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Old 30th April 2016
Harold Gough Harold Gough is offline
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Re: Laow 15mm Shift Macro on Surrogate Body

More technical bits:

The magnification was about 0.4:1. The working distance was around 20mm. However, that is to the filter ring. The petal-shaped hood is up to about 30mm deep! At 1:1 the WD is under 5mm! I am not sure from where that is measured.

Harold
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Old 30th April 2016
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Beagletorque Beagletorque is offline
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Re: Laow 15mm Shift Macro on Surrogate Body

Pretty flower.
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Old 1st May 2016
Harold Gough Harold Gough is offline
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Re: Laowa 15mm Shift Macro on Surrogate Body

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Pretty flower.
Pretty expensive too!

In this reply I have corrected the lens typo in the title. It is Laowa.

Harold
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Old 1st May 2016
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Re: Laow 15mm Shift Macro on Surrogate Body

I assume you mean the lens not the plant? How do you find it?
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Old 1st May 2016
Harold Gough Harold Gough is offline
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Re: Laow 15mm Shift Macro on Surrogate Body

Quote:
Originally Posted by Beagletorque View Post
I assume you mean the lens not the plant? How do you find it?
Yes. I am not qualified to change the name of a plant! (The brand name of the lens was Venus when first issued).

Apart from it being stuck on the adapter (given a choice I would prefer it to be stuck on the Sony adapter of the two) I am happy with it. I don't want to give the impression that it is other than tricky to use, and it is by no means a macro beginner's lens, but for someone who does a lot of macro this offers extended scope for images.

There had been some reports of aberrations and of a copy arriving with metallic internal rattles (i.e. damaged in the post). I have not seen the former nor experienced the latter.

I am very experienced in using fully manual, stopped-down lenses. This could come as a shock to anyone who is not.

I have not tried the shift function but this will only be vingnette-free on m4/3. If I wanted to use a W/A shift lens I would use my OM 24mm on the full frame A7R.

Harold
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Old 4th May 2016
Harold Gough Harold Gough is offline
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Re: Laowa 15mm Shift Macro on Surrogate Body

Quote:
Originally Posted by Harold Gough View Post
The "surrogate" in the title comes from the concurrent discussion about the use of non-Olympus E images here.

The images below should have been shot on my EM-1. The lens arrived this week with adapters for m4/3 and Sony E. The lens seems to be designed for Canon (excuse language ) with adapters required for bodies with shorter registration distances.

I first attached the lens to my Sony Alpha A7R (full frame) via the Sony adapter. The images posted here are from the second session, having just missed the very closest focus in the first attempt. (It is many years since I used other than a telephoto, so lack of practice). Anyway, when it came to detaching the lens from the Sony adapter I couldn't turn it more than a few degrees after releasing the locking pin. It was exceptionally tight to attach but even more so to detach. I am in correspondence with the maker about this.


Harold
I have now identified the detachment problem. The bayonet mount on the lens turns in the opposite direction to all my others to attach or detach it.

Whichever way I turned it after unlocking the pin, it was tight when turned.

I detect the evil influence of the big C in this.

I have still not located where I put that m4/3 adapter during the hiatus.

Harold
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Old 4th May 2016
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Re: Laowa 15mm Shift Macro on Surrogate Body

Quote:
Originally Posted by Harold Gough View Post
.

I have still not located where I put that m4/3 adapter during the hiatus.

Harold
Time to start photographing where you put things...
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Old 4th May 2016
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Re: Laowa 15mm Shift Macro on Surrogate Body

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Originally Posted by Graham_of_Rainham View Post
Time to start photographing where you put things...
That would not apply, as I was not putting it away, just (presumably) put it down to deal with a problem.

I have ordered another one, partly as bait for the first one.

Harold
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Old 4th May 2016
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Re: Laowa 15mm Shift Macro on Surrogate Body

The technical discussion is way beyond me, Harold but the images are impressive. Astonishing detail.
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Old 4th May 2016
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Re: Laowa 15mm Shift Macro on Surrogate Body

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The technical discussion is way beyond me, Harold but the images are impressive. Astonishing detail.
Thanks. That's a combination of lens and 36.4 MP sensor.

I had been hesitating about buying the lens, as the WD at 1:1 is <5mm. It's not so bad at 1:2 or thereabouts. There is no other lens with the wide-angle and macro combination. I'm surprised that it doesn't cost a lot more.

Harold
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