www.photomacrography.net :: View topic - MTF mapper
www.photomacrography.net Forum Index
An online community dedicated to the practices of photomacrography, close-up and macro photography, and photomicrography.
Photomacrography Front Page Amateurmicrography Front Page
Old Forums/Galleries
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
MTF mapper
Goto page Previous  1, 2, 3  Next
 
Post new topic   Reply to topic    www.photomacrography.net Forum Index -> Macro and Micro Technique and Technical Discussions
View previous topic :: View next topic  
Author Message
Adalbert



Joined: 30 Nov 2015
Posts: 350

PostPosted: Tue Jan 30, 2018 3:57 am    Post subject: Reply with quote

Hello Smokedaddy,
Probably the black diamond at the bottom of the following slide would be better:
https://www.ebay.com/itm/Microscope-Eyepiece-Lens-Micrometer-Calibration-Slide-for-Calculate-Area-D-25mm/252718016618?_trkparms=aid%3D555017%26algo%3DPL.CASSINI%26ao%3D1%26asc%3D20170221125811%26meid%3D71873979cffd443facb2e53ee4e2aa17%26pid%3D100753%26rk%3D1%26rkt%3D1%26%26itm%3D252718016618&_trksid=p2045573.c100753.m4841
BR, ADi
Back to top
View user's profile Send private message
Smokedaddy



Joined: 07 Oct 2006
Posts: 1084
Location: Phoenix, Arizona

PostPosted: Tue Jan 30, 2018 11:01 am    Post subject: Reply with quote

I actually have one of those but never used it. I thought it was an eyepiece reticle to (somehow) measure things directly through the eyepiece.



-JW:
Back to top
View user's profile Send private message Visit poster's website
Smokedaddy



Joined: 07 Oct 2006
Posts: 1084
Location: Phoenix, Arizona

PostPosted: Tue Jan 30, 2018 12:15 pm    Post subject: Reply with quote

Updated image to include a scale bar.

... not that it matters, here are a couple of pics I just did with it. Canon 50D, a Canon 1.4x teleconverter, a couple extension tubes and a Nikon Plan Apo CFN 10X/0.45.

Below, 100% crop;



Below full size image, just resized to 1024;



-JW:


Last edited by Smokedaddy on Tue Jan 30, 2018 12:39 pm; edited 3 times in total
Back to top
View user's profile Send private message Visit poster's website
rjlittlefield
Site Admin


Joined: 01 Aug 2006
Posts: 18791
Location: Richland, Washington State, USA

PostPosted: Tue Jan 30, 2018 12:28 pm    Post subject: Reply with quote

Smokedaddy wrote:
... not that it matters, here are a couple of pics I just did with it. Canon 50D, a Canon 1.4x teleconverter, a couple extension tubes and a Nikon Plan Apo CFN 10X/0.45.

Below, 100% crop;


The roughness of these edges is quite worrisome. That'll probably make the automated analysis think that the edge has been smeared out over a larger width, artificially lowering the curve.

--Rik
Back to top
View user's profile Send private message Visit poster's website
Adalbert



Joined: 30 Nov 2015
Posts: 350

PostPosted: Tue Jan 30, 2018 1:54 pm    Post subject: Reply with quote

Hello Rik,
This time the MTF of the single image from the stack:



and of the DMap (cut 200x200 in the middle) :


with the following threshold:


BR, ADi
Back to top
View user's profile Send private message
Adalbert



Joined: 30 Nov 2015
Posts: 350

PostPosted: Tue Jan 30, 2018 2:11 pm    Post subject: Reply with quote

Hello Smokedaddy,
Would you please check if you can use this slide with the output-mode=profile of the MTF-mapper?
BR, ADi
Back to top
View user's profile Send private message
Smokedaddy



Joined: 07 Oct 2006
Posts: 1084
Location: Phoenix, Arizona

PostPosted: Wed Jan 31, 2018 11:55 am    Post subject: Reply with quote

I am not familiar with the program, nor it's operations, settings and so forth. I did open a couple of images with the program but didn't adjust any settings. Here are the results. They both were 100% crops.

Update: I should of noted that the images I posted are just screen captures of the images I used and not the actual images.







-JW:
Back to top
View user's profile Send private message Visit poster's website
Adalbert



Joined: 30 Nov 2015
Posts: 350

PostPosted: Wed Feb 07, 2018 7:07 am    Post subject: Reply with quote

Hi Smokedaddy,
Really nice curve :-)

BTW, I have ordered this one:
https://www.ebay.de/itm/Mikroskop-Testpraparat-Nr-3-fur-z-B-Zeiss-Jena-Nikon-Olympus-Zeiss-Oberkochen/292330772968?hash=item44104599e8:g:4eUAAOSwTEJaDF7x

This is the test 2 but I have already shown the test 1 from the BW-Optik in the following thread:
http://www.photomacrography.net/forum/viewtopic.php?t=32954&highlight=

BR, ADi
Back to top
View user's profile Send private message
billjanes1



Joined: 30 Dec 2016
Posts: 79
Location: Lake Forest, IL, USA

PostPosted: Wed Feb 07, 2018 10:35 am    Post subject: Reply with quote

[quote="rjlittlefield"]
lothman wrote:

I'm actually pretty happy with the results that ADi is getting with his razor blade. Perhaps the razor blades that I have looked at in the past were just badly made. I'll get another sample next time I go to the grocery store.
--Rik


Rik,

You might consider looking at these German razor blades that Jim Kasson uses in his macro MTF testing. You might not find them in you local grocery store, but I had no trouble getting them online.

Regards,

Bill

http://blog.kasson.com/the-last-word/towards-a-macro-mtf-test-protocol/
Back to top
View user's profile Send private message
rjlittlefield
Site Admin


Joined: 01 Aug 2006
Posts: 18791
Location: Richland, Washington State, USA

PostPosted: Wed Feb 07, 2018 12:47 pm    Post subject: Reply with quote

Actually I could not find any double-edge razor blades at several grocery stores, so I ordered a couple of different brands at Amazon.

On quick examination, one of them looks to have sections that may be usable even at high magnification.

Now I just need to find time to run some careful tests.

--Rik
Back to top
View user's profile Send private message Visit poster's website
Smokedaddy



Joined: 07 Oct 2006
Posts: 1084
Location: Phoenix, Arizona

PostPosted: Wed Feb 07, 2018 1:03 pm    Post subject: Reply with quote

I do extreme paper cutting and never thought about using one of the Swann-Morton #11 surgical scalpel blades I use. I would think their edge would be the sharpest. I know they're sharper than the typical #11 X-Acto type blades.
Back to top
View user's profile Send private message Visit poster's website
Smokedaddy



Joined: 07 Oct 2006
Posts: 1084
Location: Phoenix, Arizona

PostPosted: Wed Feb 07, 2018 1:18 pm    Post subject: Reply with quote

I was also just reading about polished feather blades. Seems they have the sharpest edges of any but I couldn't find a comparison between those and a scalpel blade.
Back to top
View user's profile Send private message Visit poster's website
rjlittlefield
Site Admin


Joined: 01 Aug 2006
Posts: 18791
Location: Richland, Washington State, USA

PostPosted: Wed Feb 07, 2018 7:38 pm    Post subject: Reply with quote

The edge must be not only sharp and smooth, it must also be perfectly straight. Several of the blades that I've looked at have edges that appear sharp and smooth, but when the stage is slid sideways, my eye picks up shallow scallops along the edge. I have not experimented with any of these, but I would not expect a scalloped edge to give accurate results.

--Rik
Back to top
View user's profile Send private message Visit poster's website
Smokedaddy



Joined: 07 Oct 2006
Posts: 1084
Location: Phoenix, Arizona

PostPosted: Wed Feb 07, 2018 7:41 pm    Post subject: Reply with quote

This is what I use.

https://www.swann-morton.com/product/18.php

-JW:
Back to top
View user's profile Send private message Visit poster's website
Smokedaddy



Joined: 07 Oct 2006
Posts: 1084
Location: Phoenix, Arizona

PostPosted: Wed Feb 07, 2018 7:54 pm    Post subject: Reply with quote

I was reading on one of the knife/blade forums and razor blade forums about this. Seems the Feather razors were the sharpest. There's a guy that had access to a SEM that did a review on quite a few brands but the links seem to be broken. I did find the pics in another search.

As for the scalpel blades they're absolutely the sharpest without a doubt for my hobby, nothing compares. However I haven't a clue how they compare to razor blades.

http://s1200.photobucket.com/user/scalmas/library/Razor%20SEM?sort=3&page=1

http://photobucket.com/gallery/user/scalmas/media/cGF0aDpSYXpvciBTRU0vRmVhdGhlcl8xNTB4LmpwZw==/?ref=

... and the forum where it all started;

https://www.badgerandblade.com/forum/threads/scanning-electron-microscope-blade-edge-images.386550/

-JW:L
Back to top
View user's profile Send private message Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic    www.photomacrography.net Forum Index -> Macro and Micro Technique and Technical Discussions All times are GMT - 7 Hours
Goto page Previous  1, 2, 3  Next
Page 2 of 3

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group