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Old Sep 3, 2006, 3:38 AM   #1
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I got ahold of a Sigma 600mm F8 but it's a fixed aperature manual focus. I can set the D50 to manual and MF but it still sits there blinking "F--" like it can't read the F stop value of this lense and I can't seem to find any way to set the F-stop value on the camera.

I mostly want to use this lense for night time moon and other astral photography so I'd be setting everything manually anyways.

Any ideas on how to get the camera to work with this lense?
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Old Sep 3, 2006, 7:44 AM   #2
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Fixed Apperature means you CAN'T set the Fstop.... Its Always F8
So its just the shutter speed and ISO that you control.

Also older lenses that don't hook up with the d50's electronicly controlled apperature, almost always have an apperature ring that you turn to set the apperature. ITs not controlled on the camera.
Only those new DX/DG lenses don't have apperature rings. (that I know of)
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Old Sep 3, 2006, 8:11 AM   #3
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Lexiticus wrote:
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Fixed Apperature means you CAN'T set the Fstop.... Its Always F8
So its just the shutter speed and ISO that you control.

Also older lenses that don't hook up with the d50's electronicly controlled apperature, almost always have an apperature ring that you turn to set the apperature. ITs not controlled on the camera.
Only those new DX/DG lenses don't have apperature rings. (that I know of)
Right I know I can't set the aperature on the lens. I'm trying to figure out how to make the camera not freak out by not seeing an aperature from the lens.

Is there a setting on the D50 that I'm overlooking to make it work with the lens?
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Old Sep 3, 2006, 8:46 AM   #4
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you have to set the f-stop on the lens to the highest f-stop and then control the f-stop through the D50.
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Old Sep 3, 2006, 8:47 AM   #5
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cnip288 wrote:
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you have to set the f-stop on the lens to the highest f-stop and then control the f-stop through the D50.
The lens is a fixed aperature lens. There is no aperature ring. it never changes aperature it's a reflector type lens.
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Old Sep 3, 2006, 8:49 AM   #6
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sorry missed that part.
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Old Sep 3, 2006, 8:52 AM   #7
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cnip288 wrote:
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sorry missed that part.
No problem. I'm just trying to figure out how to get this puppy to work with my camera.
I'm gona try putting the TC on it and see if that helps things any.
Worst case scenario I wind up with 840mm instead of 600mm. Not a terrible thing considering what I'm planning to shoot.
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Old Sep 3, 2006, 9:30 AM   #8
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interestingly it worked with a Sigma 1.4x Teleconverter on it.
but then the zoom became incredible.
between the 1.4x TC and the 1.5 correction factor on the dSLR the zoom became unmanageable.
Objects over 100 yards away were brought to nearly macro appearance distance. A tripod is needed even at 1/500th a second.
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Old Sep 4, 2006, 1:40 PM   #9
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Interesting what you're trying to do there, Sky042. Feel free to post some pics when you finally get the puppy to behave.
Cheers and best of luck!
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Old Sep 4, 2006, 10:45 PM   #10
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Interesting what you're trying to do there, Sky042. Feel free to post some pics when you finally get the puppy to behave.
Cheers and best of luck!
IF the weather behaves the lens will get it's debut this week wed or thursday.
However the skies may not clear for me and frankly at 840mm effective zoom theres little land based I can do with it right now.
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