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Craig Gerard

Joined: 01 May 2010
Posts: 2877
Location: Australia

Posted: Wed Aug 20, 2014 3:39 pm    Post subject: Re: magnification

 Amro wrote: what do you mean by x10? 10:1 on sensor or linear eye magnification?

10X on sensor if requirements of the objective have been applied (tube length for 'finite' objectives or focal length of tube lens assembly for infinity-corrected objectives).

Craig
_________________
To use a classic quote from 'Antz' - "I almost know exactly what I'm doing!"
Amro

Joined: 17 Jan 2014
Posts: 10

Posted: Wed Aug 20, 2014 3:48 pm    Post subject: Re: magnification

 Quote: 10X on sensor if requirements of the objective have been applied (tube length for 'finite' objectives or focal length of tube lens assembly for infinity-corrected objectives). Craig

on Full frame sensor??
do you know what is the relation of magnification on sensor and eye linear magnification?
rjlittlefield

Joined: 01 Aug 2006
Posts: 20473
Location: Richland, Washington State, USA

Posted: Sat Aug 23, 2014 4:15 pm    Post subject: Re: magnification

 Amro wrote: on Full frame sensor??

Sensor size does not change the magnification. "10X on sensor" always means that the image on sensor is 10 times larger than the real subject.

Instead, at any fixed magnification the sensor size determines the field size -- the size of subject that will fill the sensor. A full frame sensor is 36 x 24 mm, so 10X on a full frame sensor means the field size on subject will be 3.6 x 2.4 mm. An APS-C sensor is about 22 x 15 mm, so 10X on an APS-C sensor means the field size would be about 2.2 x 1.5 mm. (10*3.6 = 36, and so on.)

 Quote: do you know what is the relation of magnification on sensor and eye linear magnification?

In a microscope, the eye linear magnification is calculated as objective magnification multiplied by eyepiece magnification.

The typical eyepiece magnification is 10X with roughly 20 mm diameter field, so imaging with a 10X objective on APS-C gives you about the same image that you would see by eye at 100X.

--Rik
ckatosmith

Joined: 08 Mar 2013
Posts: 64
Location: Pacific Northwest

Posted: Sun Aug 31, 2014 12:27 am    Post subject:

 rjlittlefield wrote: More complete designations for the two lenses I mentioned in previous post are: 1. Nikon CFI Plan Achromat 10x NA 0.25 WD 10.5mm (part number MRL00102). 2. Nikon CFI BE Plan Achromat 10X NA 0.25 WD 6.7 (part number MRN70100). --Rik

The 10x that came with my Nikon Eclipse E200 microscope is black with a yellow band. According to Nikon's website, it is CFI E Plan Achromat 10X/0.25 with WD 7.0. It has a 25mm thread and is MRP70100, also OFN20 (what's that?). Has THIS objective been tested here on the forum? I tried the search function...
rjlittlefield

Joined: 01 Aug 2006
Posts: 20473
Location: Richland, Washington State, USA

Posted: Sun Aug 31, 2014 9:33 am    Post subject:

 ckatosmith wrote: According to Nikon's website, it is CFI E Plan Achromat 10X/0.25 with WD 7.0. It has a 25mm thread and is MRP70100, also OFN20 (what's that?). Has THIS objective been tested here on the forum? I tried the search function...

I cannot recall ever seeing a test report for that objective. I can find a few references at photomacrography.net using Google search, but none of them are accompanied by images or comparisons to other objectives.

Based on its placement within the Nikon line, I would expect it to behave optically very similar to the CFI BE MRN70100.

OFN20 refers to the "field number", which is just the diameter in mm of the eyepiece field for which the objective is designed.

However, modern Nikon objectives typically deliver good image quality over a much larger circle than they are specified for.

Based on the MRL70100, I would expect the MRP70100 to cover APS/C with no problem at all (28 mm diagonal). Iit might well cover full frame with pretty good corners also (43 mm diagonal).

The MRP70100 is part of Nikon's CFI60 series [REF]. This means that it has 25mm threads and a "parfocal" distance of 60 mm from the shoulder of the mounting threads to the in-focus subject.

--Rik
Tecumseh

Joined: 20 Dec 2014
Posts: 35

 Posted: Wed Dec 24, 2014 11:07 pm    Post subject: is this the same one Is this the same one as in page 1. http://www.ebay.com/itm/261584040052?_trksid=p2055119.m1438.l2649&ssPageName=STRK:MEBIDX:IT Thank you very much. Merry Christmas guys.
rjlittlefield

Joined: 01 Aug 2006
Posts: 20473
Location: Richland, Washington State, USA

 Posted: Thu Dec 25, 2014 2:45 am    Post subject: Yes, and this is a fair price for this type of objective purchased new. --Rik
rjlittlefield

Joined: 01 Aug 2006
Posts: 20473
Location: Richland, Washington State, USA

Posted: Sun Dec 31, 2017 12:44 am    Post subject:

A discussion of "Raynox DCR-150 tube assembly with flocking" can be read at http://www.photomacrography.net/forum/viewtopic.php?t=35350 .

Here is a summary of what's discussed there:

--Rik

Edit: Oct 15, 2019, to embed image of the tube assembly.

Last edited by rjlittlefield on Tue Oct 15, 2019 4:24 pm; edited 1 time in total
tibicuk

Joined: 27 Dec 2018
Posts: 1

 Posted: Thu Dec 27, 2018 10:53 am    Post subject: Dear experts! Can this pairing work? Admin edit: I've added img tags to make visible the pictures
Pau

Joined: 20 Jan 2010
Posts: 4949
Location: Valencia, Spain

 Posted: Thu Dec 27, 2018 4:06 pm    Post subject: Hi tibicuk, welcome aboard! I don't think that the EF-S 18-135 lens would make a good tube lens. The adapter is for RMS objectives while the Nikon CFI pictured has a wider thread mount: M25X0.75 Do you already own it the Canon lens? If not, don't buy it. I have one at hand, could test it for you upon your request._________________Pau
kiennosuke

Joined: 03 Feb 2017
Posts: 22

 Posted: Sun Feb 03, 2019 10:40 am    Post subject: Adapters for Mitutoyo BD PLAN APO 10x/ NA 0.28 WD 34mm Hello guys and please help. I recently bought a Mitutoyo bd plan apo 10x. It's my first time in microscopy and i have no idea how to mount it. I Have: 1. Canon 70d 2. Sigma 100-400mm contemporary for tube lens - would it work 3. Canon 24-105 L v2 as another possible tube lens I would like to mount it on the sigma to see if it works. What exactly are the adapters required- that's where I'm stuck. Many thanks for your help!
Pau

Joined: 20 Jan 2010
Posts: 4949
Location: Valencia, Spain

kiennosuke

Joined: 03 Feb 2017
Posts: 22

Posted: Sun Feb 03, 2019 11:59 am    Post subject:

Thanks a lot Pau for replying, meantime I read the same thread and figured it out about adapters. As for the tube lens, what lens should I use? A prime 200mm? If I use a zoom lens (i'd like this for varying the magnification) would the image IQ decrease? I run into this: https://www.thorlabs.com/thorproduct.cfm?partnumber=ITL200 but I don't quite afford spending another 500\$.
Pau

Joined: 20 Jan 2010
Posts: 4949
Location: Valencia, Spain

 Posted: Sun Feb 03, 2019 12:09 pm    Post subject: People are getting excellent results with old manual 200 and 135mm prime lenses. Another good approach is the use of good quality diopters like Raynox or the Sigma Life Size Adapter on bellows ot tubes There is a ton of threads at the forum on this subject My Canon 70-200 f4L IS USM works well between 200 and 140mm on 7D although I've not performed true tests against other tube lenses. At lower magnifications it vignettes and this is the problem with many zooms: they often only work at their longer FL_________________Pau
kiennosuke

Joined: 03 Feb 2017
Posts: 22

Posted: Sun Feb 03, 2019 12:14 pm    Post subject:

 Pau wrote: People are getting excellent results with old manual 200 and 135mm prime lenses. Another good approach is the use of good quality diopters like Raynox or the Sigma Life Size Adapter on bellows ot tubes There is a ton of threads at the forum on this subject My Canon 70-200 f4L IS USM works well between 200 and 140mm on 7D although I've not performed true tests against other tube lenses. At lower magnifications it vignettes and this is the problem with many zooms: they often only work at their longer FL

Thanks again for the prompt and helpful reply. I have an old Zeiss Sonnar 135mm m42 lens, I'll begin to experiment and reading the forum
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