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Craig Gerard
Joined: 01 May 2010
Posts: 2877
Location: Australia
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 Posted: Thu Nov 03, 2011 5:46 am Post subject: |
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| Quote: | | How crucial is it to have exactly 150 mm ? |
A distance of 146.5mm does not present a problem of relevant concern.
The designated tube length distance of 150mm from sensor to objective shoulder will provide 10X magnification on sensor when using a 10X objective. A distance greater than or less than 150mm will have some impact on optimal magnification particularly when using finite objectives. The extent of that impact will depend on how far you deviate from the optimal tube length; but within reason it is okay to move a limited distance in either direction < or >.
Craig
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To use a classic quote from 'Antz' - "I almost know exactly what I'm doing!" |
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Sylvain
Joined: 31 Oct 2011
Posts: 11
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| Posted: Thu Nov 03, 2011 7:43 am Post subject: |
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| Craig Gerard wrote: | | Quote: | | How crucial is it to have exactly 150 mm ? |
A distance of 146.5mm does not present a problem of relevant concern.
Craig |
THANK YOU ! |
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Pau
Site Admin
Joined: 20 Jan 2010
Posts: 4959
Location: Valencia, Spain
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| Posted: Thu Nov 03, 2011 8:47 am Post subject: Re: FAQ: How can I hook a microscope objective to my camera? |
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| Sylvain wrote: | [
I am not taking in account the "chipped" adapter that accepts M42x1 threaded optics on the lens side, and presents an interface to the camera.
It seems that for Nikon this is less suitable and not really needed. |
I have read that some Nikon bodies don't meter without a chip while others like D300 do.
Because I don't use Nikon cameras I'm not sure, but other members would give you more precise information.
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Pau |
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Sylvain
Joined: 31 Oct 2011
Posts: 11
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| Posted: Thu Nov 03, 2011 8:56 am Post subject: Re: FAQ: How can I hook a microscope objective to my camera? |
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| Pau wrote: | | Sylvain wrote: | [
I am not taking in account the "chipped" adapter that accepts M42x1 threaded optics on the lens side, and presents an interface to the camera.
It seems that for Nikon this is less suitable and not really needed. |
I have read that some Nikon bodies don't meter without a chip while others like D300 do.
Because I don't use Nikon cameras I'm not sure, but other members would give you more precise information. |
For "manual" this is not a problem I guess. |
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Sylvain
Joined: 31 Oct 2011
Posts: 11
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ChrisLilley
Joined: 01 May 2010
Posts: 680
Location: Nice, France (I'm British)
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| Posted: Thu Nov 03, 2011 9:57 am Post subject: Re: FAQ: How can I hook a microscope objective to my camera? |
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| Pau wrote: | | Sylvain wrote: | [
I am not taking in account the "chipped" adapter that accepts M42x1 threaded optics on the lens side, and presents an interface to the camera.
It seems that for Nikon this is less suitable and not really needed. |
I have read that some Nikon bodies don't meter without a chip while others like D300 do.
Because I don't use Nikon cameras I'm not sure, but other members would give you more precise information. |
Lower level Nikon bodies do not have a mechanical aperture follower and so will not meter with old (AI, AIS) lenses. Those bodies require an electronic connection on the lens in order to meter. (They will, however, still give a focus confirm dot, although that is not needed here). Without an electronic connection they will still take a picture, in manual mode, reporting the aperture as f/1 and the focal length as 0 in the exif.
Since the extension tubes don't have aperture indexing (AI) and since the objective does not have a moveable aperture anyway, you won't see a listed aperture with the higher end bodies (D7000 and up) either and you will still be in manual mode. But, using continuous light sources, you will get + and - indicators in the viewfinder to tell you if the exposure is going to be high or low.
With flash you will be taking test shots anyway so judge the exposure on that. |
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Chris S.
Site Admin
Joined: 05 Apr 2009
Posts: 3456
Location: Ohio, USA
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| Posted: Thu Nov 03, 2011 10:04 am Post subject: Re: FAQ: How can I hook a microscope objective to my camera? |
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Regarding lack of a lens "chip":
| Sylvain wrote: | | For "manual" this is not a problem I guess. |
Absolutely not a problem. Many of us are using unchipped rigs.
And as Craig said, matching the 150mm spec isn't necessary. But in my experience with the objective you're showing, I've found it very tolerant of additional extension beyond 150, and less tolerant of lower extension. You're so close to spec that your use doesn't approach the lower extensions I've tried, so I doubt you'll see a huge difference, but if you have an extra bit of extension tube you can add, you might want to try it--even if it takes you out beyond 150.
More importantly, you have added Protostar or other flocking material to your cone-shaped adapter, right? And possibly also to your tubes? Also, your 10x objective has a space in the barrel that benefits from a bit of flocking. This rig will likely perform very differently with and without flocking.
Cheers,
--Chris
PS (Should my and related posts be moved out of the FAQ and into a thread of their own?) |
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Sylvain
Joined: 31 Oct 2011
Posts: 11
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| Posted: Thu Nov 03, 2011 10:05 am Post subject: Re: FAQ: How can I hook a microscope objective to my camera? |
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| ChrisLilley wrote: | | Pau wrote: | | Sylvain wrote: | [
I am not taking in account the "chipped" adapter that accepts M42x1 threaded optics on the lens side, and presents an interface to the camera.
It seems that for Nikon this is less suitable and not really needed. |
I have read that some Nikon bodies don't meter without a chip while others like D300 do.
Because I don't use Nikon cameras I'm not sure, but other members would give you more precise information. |
Lower level Nikon bodies do not have a mechanical aperture follower and so will not meter with old (AI, AIS) lenses. Those bodies require an electronic connection on the lens in order to meter. (They will, however, still give a focus confirm dot, although that is not needed here). Without an electronic connection they will still take a picture, in manual mode, reporting the aperture as f/1 and the focal length as 0 in the exif.
Since the extension tubes don't have aperture indexing (AI) and since the objective does not have a moveable aperture anyway, you won't see a listed aperture with the higher end bodies (D7000 and up) either and you will still be in manual mode. But, using continuous light sources, you will get + and - indicators in the viewfinder to tell you if the exposure is going to be high or low.
With flash you will be taking test shots anyway so judge the exposure on that. |
Nikon D90 ? |
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rjlittlefield
Site Admin
Joined: 01 Aug 2006
Posts: 20494
Location: Richland, Washington State, USA
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| Posted: Thu Nov 03, 2011 10:20 am Post subject: Re: FAQ: How can I hook a microscope objective to my camera? |
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| Chris S. wrote: | | PS (Should my and related posts be moved out of the FAQ and into a thread of their own?) |
At some point, yes, and then I'll summarize in the FAQ whatever seems appropriate. But for now the conversation might as well continue here, where participants expect to find it.
--Rik |
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ChrisLilley
Joined: 01 May 2010
Posts: 680
Location: Nice, France (I'm British)
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| Posted: Thu Nov 03, 2011 4:50 pm Post subject: Re: FAQ: How can I hook a microscope objective to my camera? |
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| Sylvain wrote: |
Nikon D90 ? |
Will not meter.
D40, D40x, D60, D3000, D3100, D70, D80, D90, D5000, D5100, D100 will not meter.
D200, D300, D300s, D7000, D700, D3, D3s, D3x will meter
But as I said, you are in mode M either way so the lack of metering is not really a problem and you are better to judge the lighting from a test shot anyway. |
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johan
Joined: 06 Sep 2011
Posts: 1005
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| Posted: Mon Nov 28, 2011 9:10 am Post subject: |
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Found this using a search, exactly the question I had. Very useful, thank you.
_________________
My extreme-macro.co.uk site, a learning site. Your comments and input there would be gratefully appreciated. |
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claus-j
Joined: 06 Nov 2011
Posts: 1
Location: Denmark
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| Posted: Wed Dec 14, 2011 9:22 am Post subject: RMS adapter NIkon Plan Achromat |
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Hi,
I have actually just bought the Nikon CFI Plan Achromat 10X NA 0.25 objective and are looking for a RMS adapter to it.
The thread measures 24mm - is that standard RMS?
Any clue where to find a step-up adapter 24-52mm or 24-77mm?
Kind regards,
Claus |
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Planapo
Joined: 07 Nov 2006
Posts: 1533
Location: Germany, in the United States of Europe
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conkar
Joined: 18 Dec 2010
Posts: 200
Location: Sweden
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| Posted: Wed Dec 14, 2011 2:00 pm Post subject: |
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I think Mr R.J upgraded that adapter, and the one he now shipping has the same quality as the M26 to M52.
The one that I got exchanged for a adapter with bad threading was excellent.
Regards,
Conny |
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rjlittlefield
Site Admin
Joined: 01 Aug 2006
Posts: 20494
Location: Richland, Washington State, USA
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| Posted: Wed Dec 14, 2011 5:30 pm Post subject: Re: RMS adapter NIkon Plan Achromat |
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| claus-j wrote: | I have actually just bought the Nikon CFI Plan Achromat 10X NA 0.25 objective and are looking for a RMS adapter to it.
The thread measures 24mm - is that standard RMS? |
To clarify: the thread is nominally 25mm, not 24mm. The unit I have in hand right now measures 24.89 mm OD on the threads. No, it's not RMS; that's only about 20.25 mm.
--Rik |
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