Advice to buy a Plan objective

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Marc
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Joined: Thu Mar 25, 2021 1:58 am

Advice to buy a Plan objective

#1 Post by Marc » Wed Jun 02, 2021 5:25 am

Hi,
I want to buy one plan objective to check the difference field with common achromatic objective.
My microscope have 4x, 10x, 40x, 100x + one additional 60x . Also I use camera.

I use more extensively 40x and 60x, although I'm not sure if the plan field can be more profitable for the others sizes, specially with camera.

What can be the best choosing to add the first plan objective?

apochronaut
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Joined: Fri May 15, 2015 12:15 am

Re: Advice to buy a Plan objective

#2 Post by apochronaut » Wed Jun 02, 2021 2:26 pm

That entirely depends on what you are looking at . If you are looking at relatively thick specimens, a plan objective may not be of much value. If I had to choose just one though, it would probably be a 20X.

Marc
Posts: 32
Joined: Thu Mar 25, 2021 1:58 am

Re: Advice to buy a Plan objective

#3 Post by Marc » Fri Jun 04, 2021 3:36 am

I understand. My main interest in plan objectives is not for eyes but for the camera.

I have found this thread in the topic with some images, and the change is better at higher magnifications.
I will try 60x

https://www.microbehunter.com/microscop ... php?t=9846


Image

MicroBob
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Location: Northern Germany

Re: Advice to buy a Plan objective

#4 Post by MicroBob » Fri Jun 04, 2021 7:35 am

Hi Marc,
to make good use of a plan objective in photography you need a camera adaptation that preserves this planarity. What kind of microscope and camera adaptation do you use and does it fit to the objective in mind?
On a good microscope system plan objectives give a planar image to a field of at least 18mm, often much more, independent of the magnification. So you should be free to choose the magnification where you profit most from the planarity. Many objects are not flat themselves so they don't profi much from a plan setup. For me planarity is most valued for plant sections and objectives from 6,3:1 to 25:1.

Here are some very interesting articles on the need for planarity and on micro photography, written by Rolf Vossen, an experienced microscopist who makes up his own mind:
https://microscopyofnature.com/praise-humble-achromat
https://microscopyofnature.com/micro-photography

Bob

DrPhoxinus
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Location: Rochester Hills, MI

Re: Advice to buy a Plan objective

#5 Post by DrPhoxinus » Fri Jun 04, 2021 1:18 pm

Bob,

Thank you for those links.
More complex is not always better and complexity has its costs.


Gerard

apochronaut
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Re: Advice to buy a Plan objective

#6 Post by apochronaut » Fri Jun 04, 2021 1:54 pm

It also depends on the individual objective design. Some standard objectives have surprisingly flat fields.

Marc
Posts: 32
Joined: Thu Mar 25, 2021 1:58 am

Re: Advice to buy a Plan objective

#7 Post by Marc » Mon Jun 07, 2021 11:22 pm

thank you MicroBob for these links and explanations, really helpful!

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