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FAQ: How can I hook a microscope objective to my camera?
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Craig Gerard



Joined: 01 May 2010
Posts: 2877
Location: Australia

PostPosted: Wed Aug 20, 2014 3:39 pm    Post subject: Re: magnification Reply with quote

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
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Amro



Joined: 17 Jan 2014
Posts: 10

PostPosted: Wed Aug 20, 2014 3:48 pm    Post subject: Re: magnification Reply with quote

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?
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 17987
Location: Richland, Washington State, USA

PostPosted: Sat Aug 23, 2014 4:15 pm    Post subject: Re: magnification Reply with quote

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
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ckatosmith



Joined: 08 Mar 2013
Posts: 63
Location: Pacific Northwest

PostPosted: Sun Aug 31, 2014 12:27 am    Post subject: Reply with quote

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...
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 17987
Location: Richland, Washington State, USA

PostPosted: Sun Aug 31, 2014 9:33 am    Post subject: Reply with quote

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
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Tecumseh



Joined: 20 Dec 2014
Posts: 35

PostPosted: Wed Dec 24, 2014 11:07 pm    Post subject: is this the same one Reply with quote

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.
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 17987
Location: Richland, Washington State, USA

PostPosted: Thu Dec 25, 2014 2:45 am    Post subject: Reply with quote

Yes, and this is a fair price for this type of objective purchased new.

--Rik
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