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Cognisys Stackshot and MP-E65 Alignment adaptor

 
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JasonC



Joined: 14 Feb 2014
Posts: 14
Location: Swadlincote, Derbyshire

PostPosted: Fri Feb 02, 2018 4:16 am    Post subject: Cognisys Stackshot and MP-E65 Alignment adaptor Reply with quote

I do a fair bit of stacking using an MP-E65 lens and the Cognisys stackshot, however one problem I get is trying to align the lens with the Stackshot which is very important when stacking. See this article here by Peter Lin which explains the problem in more depth - https://pylin.com/2017/10/15/analysis-of-misalignment-between-optical-and-motion-axis-for-focus-stacking/

The problem is that the lens (via its ring) just attaches to a flat plate on the Stackshot so, I have designed an adaptor to fix this problem which ensures the lens is attached perfectly square everytime. This adaptor is 3D printable and I have made it available for free download here if you want to use it yourself. If you don't have a 3d printer please PM me.

More pictures here

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ChrisR
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Joined: 14 Mar 2009
Posts: 7832
Location: Near London, UK

PostPosted: Fri Feb 02, 2018 5:11 am    Post subject: Reply with quote

That looks very neat, I'll be in touch!
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mawyatt



Joined: 22 Aug 2013
Posts: 1595
Location: Clearwater

PostPosted: Fri Feb 02, 2018 7:39 am    Post subject: Reply with quote

Jason,

Very useful adapter, alignment is a constant problem when stacking for me. I am always in a struggle to get the ARCA adapters orthogonal to the optical axis and the camera plate aligned. Over time they tend to loosen up and lose alignment further aggravating the problem!!

The Canon MP-E 65 is a nice lens, but Nikon (I use Nikon bodies) has no equivalent, although Laowa has a new Macro that may prove useful.

Your 3D printing work is nice, like this adapter and your fixture previously mentioned.

Best,

Mike
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JasonC



Joined: 14 Feb 2014
Posts: 14
Location: Swadlincote, Derbyshire

PostPosted: Fri Feb 02, 2018 7:47 am    Post subject: Reply with quote

mawyatt wrote:
Jason,

Very useful adapter, alignment is a constant problem when stacking for me. I am always in a struggle to get the ARCA adapters orthogonal to the optical axis and the camera plate aligned. Over time they tend to loosen up and lose alignment further aggravating the problem!!

The Canon MP-E 65 is a nice lens, but Nikon (I use Nikon bodies) has no equivalent, although Laowa has a new Macro that may prove useful.

Your 3D printing work is nice, like this adapter and your fixture previously mentioned.

Best,

Mike


Thanks. Well if you need one making let me know, I would just need a few measurements.
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Smokedaddy



Joined: 07 Oct 2006
Posts: 1167
Location: Phoenix, Arizona

PostPosted: Fri Feb 02, 2018 10:55 am    Post subject: Reply with quote

... out of curiosity how do you determine/verify that the sensor is parallel with a flat specimen? Let's say like a coin or semiconductor die/chip.
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JasonC



Joined: 14 Feb 2014
Posts: 14
Location: Swadlincote, Derbyshire

PostPosted: Fri Feb 02, 2018 11:07 am    Post subject: Reply with quote

Smokedaddy wrote:
... out of curiosity how do you determine/verify that the sensor is parallel with a flat specimen? Let's say like a coin or semiconductor die/chip.


Yeah that's quite tricky as well, although not so important if you are stacking because each corner would be in focus anyway.
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Smokedaddy



Joined: 07 Oct 2006
Posts: 1167
Location: Phoenix, Arizona

PostPosted: Fri Feb 02, 2018 11:30 am    Post subject: Reply with quote

JasonC wrote:
Smokedaddy wrote:
... out of curiosity how do you determine/verify that the sensor is parallel with a flat specimen? Let's say like a coin or semiconductor die/chip.


Yeah that's quite tricky as well, although not so important if you are stacking because each corner would be in focus anyway.


Just something I don't understand how to accomplish this quickly. With my setup, not a automated rail, it's important. Mainly because I don't have to take as many pictures if the sensor and specimen (say a semiconductor wafer) are parallel with each other. My setup is adjustable in every axis.
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mawyatt



Joined: 22 Aug 2013
Posts: 1595
Location: Clearwater

PostPosted: Fri Feb 02, 2018 11:39 am    Post subject: Reply with quote

If your stacking with Zerene you can look at the log and see how much correction in needed when stacking the images.

I recall Peter at MJKZZ shot the tip of a fine needle and you could see the deviation from the axis, also some folks have used dust on the sensor to help track how well the alignment is.

Would be nice to have a super fine adjustment you could tweak for alignment, but I haven't seen this before.

Best,
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ChrisR
Site Admin


Joined: 14 Mar 2009
Posts: 7832
Location: Near London, UK

PostPosted: Fri Feb 02, 2018 11:48 am    Post subject: Reply with quote

Smokedaddy wrote:
JasonC wrote:
Smokedaddy wrote:
... out of curiosity how do you determine/verify that the sensor is parallel with a flat specimen? Let's say like a coin or semiconductor die/chip.


Yeah that's quite tricky as well, although not so important if you are stacking because each corner would be in focus anyway.


Just something I don't understand how to accomplish this quickly. With my setup, not a automated rail, it's important. Mainly because I don't have to take as many pictures if the sensor and specimen (say a semiconductor wafer) are parallel with each other. My setup is adjustable in every axis.
If you took just two pictures, one slightly closer than the other but both with stuff in focus, and watch DMap stacking those two, you'd see which part of which frame was used. Use to guide which way to tilt the specimen. Any help?
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Chris R
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JasonC



Joined: 14 Feb 2014
Posts: 14
Location: Swadlincote, Derbyshire

PostPosted: Sat Feb 03, 2018 1:47 am    Post subject: Reply with quote

The only other way is to make something that would give you perfect alignment like I have done with this bracket, but obviously at the lens end.
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