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autoexer

Waukesha, US
1099 posts

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autoexer Silver Member Nikonian since 27th Jan 2011
Wed 10-Oct-12 10:32 PM | edited Wed 10-Oct-12 11:24 PM by autoexer

i am using my D70 with a camera adapter on my telescope. the f-stop of the scope is f/8. is there any way to set the apeture on the camera to f/8 instead of F--? i have it in "M" now.

never mind...found it in the manual - it displays "F--" with a non-CPU lens...oh well

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MEMcD

US
28361 posts

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#1. "RE: Question about my D70" | In response to Reply # 0

MEMcD Moderator In depth knowledge in various areas Nikonian since 24th Dec 2007
Thu 11-Oct-12 02:16 AM

Hi Art,

While you won't be able to meter, you will be able to capture images as long as you have the camera in Manual exposure mode.
Good Luck and Enjoy your Nikons!

Best Regards,
Marty

autoexer

Waukesha, US
1099 posts

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#2. "RE: Question about my D70" | In response to Reply # 1

autoexer Silver Member Nikonian since 27th Jan 2011
Thu 11-Oct-12 02:22 AM

i have! i test fired some today - basicly a 900mm f/8 lens... cool and i can change the magnification by changing the eye piece

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MEMcD

US
28361 posts

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#3. "RE: Question about my D70" | In response to Reply # 2

MEMcD Moderator In depth knowledge in various areas Nikonian since 24th Dec 2007
Fri 12-Oct-12 12:58 AM

Hi Art.

Have fun!
Good Luck and Enjoy your Nikons!

Best Regards,
Marty

autoexer

Waukesha, US
1099 posts

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#4. "RE: Question about my D70" | In response to Reply # 3

autoexer Silver Member Nikonian since 27th Jan 2011
Fri 12-Oct-12 01:02 AM

cloudy last night....raining tonight - i will wait!

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OnTERRYo

Hamilton, CA
538 posts

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#5. "RE: Question about my D70" | In response to Reply # 4

OnTERRYo Silver Member Nikonian since 25th Nov 2011
Fri 12-Oct-12 05:14 PM | edited Fri 12-Oct-12 05:24 PM by OnTERRYo

Hi Art.

I did something similar last July.
Here's a shot of my set up.
I have a Bushnell Spotting Scope - Discoverer Zoom Telescope.
It is 60X and it included a F mount - bonus.
I attached it to my D70.
According to the adapter, it can provide an equivalent 4000mm lens.(!)
My tripod carrier was slung from the tripod and had a ten pound lifting weight in it for stability - I had to.
And, I was able to achieve a good shot or two.
I hope you will keep trying - I will.

Terry.

OnTERRYo

"The Nikon did the work; I just happened to be behind it at the time." TP

PRW

Plymouth, UK
228 posts

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#6. "RE: Question about my D70" | In response to Reply # 0

PRW Silver Member Nikonian since 27th Apr 2002
Fri 12-Oct-12 09:54 PM

I'm sure f/8 in astronomy refers to something different to the f/8 we refer to in photography. Don't ask me what

Kind regards,
Paul

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elec164

US
2267 posts

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#7. "RE: Question about my D70" | In response to Reply # 6

elec164 Silver Member Nikonian since 15th Jan 2009
Sat 13-Oct-12 08:56 AM | edited Sat 13-Oct-12 08:57 AM by elec164

>I'm sure f/8 in astronomy refers to something different to
>the f/8 we refer to in photography. Don't ask me what

Actually it refers to the exact same thing, focal ratio.

Reflector telescopes are usually defined by the clear aperture and f-number, not focal length.

Although with eyepiece projection I believe the effective aperture and focal length will be affected by the eyepiece itself as well as the amount of extension of the slide tube adapter which attaches the t-ring to the eyepiece.

This would be a great question to ask over in our Astrophotography Forum where Neil (moderator and very knowledgable on this) will more likely see it and give you a more precise answer.

Pete

Pete

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