Optiphot nose piece question
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Optiphot nose piece question
The original nosepiece on the phase contrast Optiphot has optics in it in addition to having a spring loaded body part. I bought a second Optiphot for parts and that nosepiece is skinnier with no glass (image 1 below). The ones listed on eBay are typically like the latter - no glass. They look different mounted up, as far as where the unused objectives are parked.
What's the difference from a functional standpoint, optics vs none?
What's the difference from a functional standpoint, optics vs none?
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- Turret_no_optics.jpg (149.39 KiB) Viewed 5765 times
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- Turret_with_optics.jpg (155.48 KiB) Viewed 5765 times
Re: Optiphot nose piece question
In the case of Olympus, the reverse nosepiece puts the objectives a bit further away - requiring a small amount of correction. Pretty sure it's the same with Nikon Optiphot. Reverse nosepiece: small correction lens comes along for the ride.
Functionally, the reverse nosepiece is a bit easier to get slides quickly on and off the stage (more clearance). The regular nosepiece avoids an extra lens. With the lens clean and undamaged, optically equivalent.
Functionally, the reverse nosepiece is a bit easier to get slides quickly on and off the stage (more clearance). The regular nosepiece avoids an extra lens. With the lens clean and undamaged, optically equivalent.
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Re: Optiphot nose piece question
Once again, thank you PeteM for your expertise. I would not have guessed that was the reason.
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Re: Optiphot nose piece question
I was most interested in this post, as I have an Optiphot 1 and a Labophot 2.
The former has a nosepiece like the one illustrated, with no extra lens, and having the objectives facing towards the user.
However, the Labophot 2 nosepiece has them facing away, which as Pete says, is much more convenient. But...there is no extra lens in the nosepiece.
As I understand it, the metal plate that takes the dovetail, and a screw that the V-notch on the nosepiece goes in, is reversed. What is interesting is that it is far harder to change this nosepiece, as it has to slide out backwards, and in from behind too.
Also intriguing, is that the stand illustrated has a limb part that takes the nosepiece that is also quite different to my optiphot. I think this may also have something to do with whether it can take the intermediate part for DIC, but I will leave others with more knowledge on this to comment.
Mike
The former has a nosepiece like the one illustrated, with no extra lens, and having the objectives facing towards the user.
However, the Labophot 2 nosepiece has them facing away, which as Pete says, is much more convenient. But...there is no extra lens in the nosepiece.
As I understand it, the metal plate that takes the dovetail, and a screw that the V-notch on the nosepiece goes in, is reversed. What is interesting is that it is far harder to change this nosepiece, as it has to slide out backwards, and in from behind too.
Also intriguing, is that the stand illustrated has a limb part that takes the nosepiece that is also quite different to my optiphot. I think this may also have something to do with whether it can take the intermediate part for DIC, but I will leave others with more knowledge on this to comment.
Mike
Re: Optiphot nose piece question
Mike - be interested to see a photo of your nosepiece. Perhaps it sits closer to the head? Perhaps it's meant for 210mm objectives and an epi head? Or??
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Re: Optiphot nose piece question
Hi Pete, late now, but with daylight, will show the two nosepieces and the head of my Optiphot.
Mike
Mike
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Re: Optiphot nose piece question
As requested/promised, photos of my nosepieces and the optiphot limb/head detail mentioned in earlier reply.
Re: Optiphot nose piece question
This week I saw an Optiphot 1 , the nosepiece has forward-pointing objectives (towards the user, not the arm) and there is no lens in it.
Re: Optiphot nose piece question
Mike - I'm wondering if there is a supplemental lens in your Labophot 2 stand, instead of the nosepiece??
I'm pretty sure the various Optiphot 1 & 2 and Labophot 1 & 2 heads are interchangeable. One exception being an early infinity head used on some wafer inspection versions of the Optiphot 66,100, etc.. So, if there is a significant distance change from the objective shoulder (on the nosepiece) to the stand dovetail (where the head mates), one would assume that:
1) The shortest distance case would be clear through - no compensating lenses as is apparently the case on your Optiphot 1.
2) The longer distance cases (e.g. reversed nosepieces) would require a supplemental lens of very low -power to either get things back to 1.0 mag or bump them up to something like 1.25x as happens with some intermediate adapters This is apparently the case with Heather's reversed nosepiece (the extra lens), but not your example. So, maybe a lens in the stand, below where the head fits?? Or???
Might be interesting to use a graduated slide and see if both your Nikon microscopes have "true" magnification.
I'm pretty sure the various Optiphot 1 & 2 and Labophot 1 & 2 heads are interchangeable. One exception being an early infinity head used on some wafer inspection versions of the Optiphot 66,100, etc.. So, if there is a significant distance change from the objective shoulder (on the nosepiece) to the stand dovetail (where the head mates), one would assume that:
1) The shortest distance case would be clear through - no compensating lenses as is apparently the case on your Optiphot 1.
2) The longer distance cases (e.g. reversed nosepieces) would require a supplemental lens of very low -power to either get things back to 1.0 mag or bump them up to something like 1.25x as happens with some intermediate adapters This is apparently the case with Heather's reversed nosepiece (the extra lens), but not your example. So, maybe a lens in the stand, below where the head fits?? Or???
Might be interesting to use a graduated slide and see if both your Nikon microscopes have "true" magnification.
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Re: Optiphot nose piece question
That reverse revolver adapter is a late addition to the original Optiphot.
Though the revolver is reversed, there's no supplemental lenses (neither in the revolver, nor the stand limb) in the Optiphot2,and Labophot2 due to a redesigned thinner limb compared to the original Optiphot. Thus no additional magnification regardless of revolver heading. (Both Labophots, 1 and 2 don't offer removable revolvers anyway. The Optiphot-2 though offers a option to switch between foward and reverse revolver positions by removing the head seat plate and reversing it.)
P.S. probably some have seen a seemingly plain Optiphot revolver with a lens in it, but that's for the Diaphot TMD. It's there to make infinity space behind the revolver, so it will not work with Optiphots.
Cheers,
John
Though the revolver is reversed, there's no supplemental lenses (neither in the revolver, nor the stand limb) in the Optiphot2,and Labophot2 due to a redesigned thinner limb compared to the original Optiphot. Thus no additional magnification regardless of revolver heading. (Both Labophots, 1 and 2 don't offer removable revolvers anyway. The Optiphot-2 though offers a option to switch between foward and reverse revolver positions by removing the head seat plate and reversing it.)
P.S. probably some have seen a seemingly plain Optiphot revolver with a lens in it, but that's for the Diaphot TMD. It's there to make infinity space behind the revolver, so it will not work with Optiphots.
Cheers,
John
Re: Optiphot nose piece question
Thanks, John.
Re: Optiphot nose piece question
HOW DO YOU REMOVE COMPLETELY THE NOSEPIECE AS ILLUSTRATED ON THE FIRST PICTURE!? I’m on a cleaning spree of my Labophot & I’ve never been able to remove it!photomicro wrote: ↑Mon Sep 09, 2019 10:21 amAs requested/promised, photos of my nosepieces and the optiphot limb/head detail mentioned in earlier reply.
DSC05571.jpg
DSC05570.jpg
DSC05568.jpg
DSC05565.jpg
Re: Optiphot nose piece question
My Labophot nosepiece looks as your example of "turret_with_optics" image, but I have no clue how to take it apart! Help please... :'(Sauerkraut wrote: ↑Sat Sep 07, 2019 4:01 pmThe original nosepiece on the phase contrast Optiphot has optics in it in addition to having a spring loaded body part. I bought a second Optiphot for parts and that nosepiece is skinnier with no glass (image 1 below). The ones listed on eBay are typically like the latter - no glass. They look different mounted up, as far as where the unused objectives are parked.
What's the difference from a functional standpoint, optics vs none?
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- Posts: 207
- Joined: Thu Aug 03, 2017 10:28 am
- Location: UK
Re: Optiphot nose piece question
Loosen the clamping screw shown on the left, and slide the nosepiece out.norilabs wrote: ↑Wed May 13, 2020 9:48 amHOW DO YOU REMOVE COMPLETELY THE NOSEPIECE AS ILLUSTRATED ON THE FIRST PICTURE!? I’m on a cleaning spree of my Labophot & I’ve never been able to remove it!photomicro wrote: ↑Mon Sep 09, 2019 10:21 amAs requested/promised, photos of my nosepieces and the optiphot limb/head detail mentioned in earlier reply.
DSC05571.jpg
DSC05570.jpg
DSC05568.jpg
DSC05565.jpg