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Author Topic: IQ180 and Mamiya 24mm fish-eye - experiences?  (Read 4451 times)
gerald.d
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« on: July 08, 2013, 11:17:39 PM »
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Hi all -

I was wondering if anyone could share some thoughts and opinions on this combination?

I'm interested in edge-to-edge sharpness, how it handles flare in direct sunlight, and expectations as to how it might compare against the Canon 24TSE (this would be on an ALPA FPS). Obviously it's a fish-eye, so ignore that in the comparison - I'd be primarily looking to use the lens to shoot 360x180 degree spherical panoramas.

Thanks in advance.

Kind regards,

Gerald.
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HarperPhotos
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« Reply #1 on: July 08, 2013, 11:40:43 PM »
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Hello,

I used to have a Mamiya 645 24mm fisheye lens which I found to be tack sharp right to the edges. I used it with a Leaf Aptus 75 so I don’t know how it would hold up to a Phase One IQ180.

Cheers

Simon
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Simon Harper
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gerald.d
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« Reply #2 on: July 08, 2013, 11:46:02 PM »
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Thanks Simon.

Just one other thing I was wondering about this lens.

If you "de-fish" an image, do you know what horizontal and vertical field of view you get?

Kind regards,

Gerald.
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HarperPhotos
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« Reply #3 on: July 09, 2013, 12:13:08 AM »
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Hi Gerald,

This is the same shot de-fished using Adobe CS6 Adaptive Wide Angle software.
The lens its self is beautifully made.

Cheers

Simon
« Last Edit: July 09, 2013, 12:15:43 AM by HarperPhotos » Logged

Simon Harper
Harper Photographics Ltd
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Auckland, New Zealand
HarperPhotos
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« Reply #4 on: July 09, 2013, 12:20:52 AM »
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Hello,

I also had the Mamiya 645 AF 28mm lens which was no where as sharp in the corners as the Mamiya 24mm lens and is a fraction of the cost of a Mamiya 28mm lens.

http://www.ebay.com/itm/Mamiya-M645-24mm-f-4-Fisheye-ULD-Lens-With-Caps-13204-20469-/370841584714?pt=Camera_Lenses&hash=item5657e1844a

Cheers

Simon
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Simon Harper
Harper Photographics Ltd
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Auckland, New Zealand
gerald.d
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« Reply #5 on: July 09, 2013, 12:23:05 AM »
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Thanks Simon - much appreciated.

I was checking out KEH today for these. That one's not in great condition, but they do have another in "excellent" condition. Hopefully if someone can confirm performance on an IQ180 I can snap it up.

Kind regard,

Gerald.

/edit
Oh wow.

Something just occurred to me.

I could use this lens on the FPS with the Max, shift and stitch, and I'd get the entire circular image out of it (180 degrees all around, rather than just across the diagonal of the 4:3 ratio format). That would give me roughly a 13,000 pixel diameter image...

« Last Edit: July 09, 2013, 12:45:00 AM by gerald.d » Logged
Grischa Rueschendorf
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« Reply #6 on: July 09, 2013, 02:55:00 AM »
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How about the 17 TSE With the canon mount directly on theFPS?
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gerald.d
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« Reply #7 on: July 09, 2013, 01:07:09 PM »
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Thanks for the suggestion Grischa.

I've got the Canon too, but am thinking that for certain applications the Mamiya fish-eye would make more sense.

I pulled the trigger on the one from KEH that was in excellent condition, so looking forward to trying it out in a couple of weeks.

I'd still be interested in others' findings with this lens on the IQ180 (although I may well be swapping in my 180 for a 260 shortly!).

Kind regards,

Gerald.
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HarperPhotos
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« Reply #8 on: July 09, 2013, 09:22:11 PM »
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Hi Gerald,

Please post your thoughts after you have had a chance to test your new lens out.

Cheers

Simon
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Simon Harper
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chrismuc
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« Reply #9 on: July 09, 2013, 10:50:48 PM »
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I recently purchased a Mam 645 24f4 FE. Just did one test shot at f11 on my FPS with IQ180. Hmm, sorry the house was too small to fit the corners of the 180° Fisheye, so can't evaluate the sharpness there.
The lens is pretty fine. Gets a bit soft, losses less contrast and shows some CA towards the full image circle, I slightly adjusted in ACR.
I uploaded the upper half of the full res pic to my dropbox for your reference.
Hope to have time soon to make a more useful (test) pics.
https://dl.dropboxusercontent.com/u/18437364/Contax645%2BiQ180/Mamiya-24F-IQ180-upperhalf.jpg
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gerald.d
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« Reply #10 on: July 10, 2013, 12:14:36 PM »
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Thanks Chris.

I'm travelling at the moment and only have an iPad Mini with me, but that's looking pretty good. Better than the Canon 17 I think.

Will be interesting to compare the 24 de-fished with the Canon when I get back home next week.

Kind regards,

Gerald.
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chrismuc
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« Reply #11 on: July 11, 2013, 03:49:14 AM »
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For comparison some more lenses shifted (vertical sensor orientation, vertical shift upwards) on FPS+IQ180.
All f11, no center filter, no LCC. CA reduction and slight sharpening applied in ACR.
Good to see the total image circles of the lenses and their 'sharp' image circles. And the different amount of linear distortion of the four retrofocus lens designs.
Canon 17f4 TSE
https://dl.dropboxusercontent.com/u/18437364/Contax645%2BiQ180/Canon-17TSE%2B12mm-upperhalf.jpg
Canon 24f3.5 TSE
https://dl.dropboxusercontent.com/u/18437364/Contax645%2BiQ180/Canon-24TSE%2B12mm-upperhalf.jpg
Contax 645 35f3.5 + Mirex
https://dl.dropboxusercontent.com/u/18437364/Contax645%2BiQ180/Contax-35%2B12mm-upperhalf.jpg
Zeiss Hasselblad CF50f4FLE + Mirex
https://dl.dropboxusercontent.com/u/18437364/Contax645%2BiQ180/Hasselblad-CF50FLE%2B15mm-upperhalf.jpg
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gerald.d
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« Reply #12 on: July 11, 2013, 04:19:14 AM »
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An extremely useful set of images, Chris.

Thanks for sharing.

Kind regards,

Gerald.
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chrismuc
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« Reply #13 on: July 11, 2013, 04:31:09 AM »
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Thx Gerald.
That building in Guangzhou is my 'wide angle reference test location' :-)
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ondebanks
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« Reply #14 on: July 19, 2013, 05:00:14 AM »
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Hi Gerald,

This is the same shot de-fished using Adobe CS6 Adaptive Wide Angle software.
The lens its self is beautifully made.

Cheers

Simon

Hi Simon,

I was comparing the de-fished image with the original and wondering, where did the extra foreground and sky near the middle of the long edges of the frame come from?

Then I looked more closely, and realised that CS6 was filling in these missing areas by duplicating clumps of grass and patches of sky, from further inside the frame!

It's done so seamlessly that if you don't look for it, you are very unlikely to see it. Very impressive stuff from Adobe.

Does the user have much/any control over how it does this?

Ray
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ondebanks
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« Reply #15 on: July 19, 2013, 05:21:02 AM »
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The lens its self is beautifully made.


Agreed, beautifully made and a fantastic performer, one of the very best M645 lenses. In fact, probably the sharpest wide open of all the lenses with focal lengths shorter than the 120mm macro.

If there's one thing I'd change about it, it would be to make the internal filter wheel user-accessible. I'd love to be able to swap in a didymium/redhancer filter, or IR-pass filter, in place of one of the standard filters, for example. The yellow filter is of very limited usage in a world of digital B&W conversion where you can just drop/reduce the blue channel.

Ray
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gerald.d
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« Reply #16 on: July 19, 2013, 05:54:25 AM »
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Great feedback folks - many thanks.

Anyone any idea how easy it would be to remove the built in lens-shade, as I'm assuming this could vignette when I shift it around on the Max?

(mine arrives tomorrow - gonna have some fun with this lens!)

Kind regards,

Gerald.
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ondebanks
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« Reply #17 on: July 22, 2013, 09:43:02 AM »
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I think that the only option is to saw the lens shade "petals" off...very carefully!

But maybe you should buy the last one of these instead - someone has already done the saw job!

Ray
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gerald.d
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« Reply #18 on: July 23, 2013, 08:45:38 AM »
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Nice find - thanks!

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gerald.d
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« Reply #19 on: August 03, 2013, 05:45:18 AM »
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OK, the shaved one has arrived, so I now have two of the 24mm fish-eyes. Regular one will be used for an upcoming timelapse project (shooting with it on IQ180 and then processing through Panolapse enables me to replicate anything from a 14mm up to around 60mm lens on FF 35mm DSLR at 4K resolution), and this shaved one for creating full image circle fisheye on MFDB.

So first little test I've done is to put the shaved lens on the ALPA Max (via Mamiya adapter) and then mounted that onto the FPS.

4 shifted shots, roughly +/- 10mm left and right, +/- 17mm up and down (combining these movements of course to shoot the four corners). Stitched together, results in a circular image just over 14,000 pixels in diameter. Weather here in Dubai is not really conducive to outdoor testing at the moment, so I've just done a quick indoor test at f/8. Pretty significant magenta/green chromatic aberration in the output which I've fixed as best I can using Photoshop (-27).

Full image:


Near center (1.63m from the front of the lens)


Near edge: (2.06m from the front of the lens)


Edge fall-off: (1.65m from the front of the lens)


All in all, I'm pretty happy with this for $600.

Hope to do some outdoor testing towards the end of the month.

Kind regards,

Gerald.




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