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Lomo AL-2000 low power magnification

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Lomo AL-2000 low power magnification

Postby CDH7 on Tue Sep 06, 2005 9:25 am

I recently purchased the LOMO LABOROSCOPE AL-2000 and have a need for low power magnification less than 40x (4x objective/10x eyepieces).

I purchased the LOMO 2.5x plan achromat objective although this objective does not fill up the entire field of view. Does this objective work with this scope? I noticed that the website lists this objective as having a NA of 0.08 although on the objective it says 0.05. Did I possibly get the wrong objective or is the description incorrect?

Are there any alternatives to getting an overall magnification of less than 40X, perhaps lower power eye piece objectives (<10x)?

If I am not able to get a workable objective less than 4x on this scope, are there any alternatives from other manufacturers that might work?

Thanks
CDH7
 
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Postby opticsplanet.com on Wed Sep 07, 2005 1:25 pm

Thank you for your recent purchase of an AL2000 with a 2.5x objective. Your questions were forwarded to me as I work for the direct distributor of the LOMO microscopes sold by Optics Planet. They asked if I would answer you directly, since they didn’t really know all of the answers. In regard to the N.A. of the objective, it is 0.05. It is listed wrong on our website for some reason. I apologize for that. In regard to filling up the entire field of view, this is a phenomena that will occur with any brand of 2.0x or 2.5x objective. I used to work for an Olympus microscope dealer, and the same thing happens with their 2.5x objectives. This is where the condenser comes into play. In order to get a full field of view with the 2.5x, you need to 1. flip out the top lens of the condenser, and 2. re-focus and center the condenser using the field diaphragm just as you would normally do with the top lens flipped in (this will require lowering the condenser height). Once you flip out the top lens of the condenser and start lowering the condenser you will see how the field widens up for you. In regard to alternatives for lower magnification, I suppose you could also look into getting 6.3x or 7x eyepieces, but that won’t reduce your total mag as much as using a 2.5x objective. It is tough to get magnifications below 40x on a compound microscope. Usually, this is where a stereomicroscope is utilized. If you have any additional questions, please feel free to contact me directly.



Best regards,

Chris
LOMO AMERICA
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