Stop down ring?

Tom Lusk · 11-05-2006, 07:33 AM

Dumb question. Is an aperture control ring the same as a stop down ring?

leaton · 11-05-2006, 07:42 AM

I'm with you Tom. What is that? Sounds like a cross between an aperture ring and a depth of field preview button.

HogRider · 11-05-2006, 09:55 AM

Originally posted by Tom Lusk

Dumb question. Is an aperture control ring the same as a stop down ring?

Are you sure it is stop down and not step down ring?

If you are sure sure it is stop down I can only think of the second ring that is usually part of older tele T mount lenses (like the Spiratone 400). You Preset the aperture with the aperture ring and then use the second ring to actually stop down to this setting. I am not sure if the correct term for this ring is stop down ring.

Jonas B · 11-05-2006, 05:29 PM

Originally posted by Tom Lusk

Dumb question. Is an aperture control ring the same as a stop down ring?

There is nothing I know of called a "stop down" ring. Stopping down is an expression for closing the aperture. A "step down" ring an adapter making a small filter fit to a larger filter thread and a "step up" adapter makes a larger filter fit a smaller lens filter thread. (A step down adapter is most often not very useful as using it most often causes vignetting as the filter is too small for the lens.
In what context was the expression "stop down" ring used?

Tom Lusk · 11-05-2006, 06:31 PM

The person is saying the stop down ring on the lens is stuck.

Must be aperture setting ring???

Jonas B · 11-05-2006, 06:42 PM

Originally posted by Tom Lusk

The person is saying the stop down ring on the lens is stuck.

Must be aperture setting ring???

Yes. A stupid way to call it.

11-05-2006, 07:33 AM	#1
Tom Lusk Veteran Member Join Date: Sep 2006 Photos: Gallery Posts: 973	Stop down ring? Dumb question. Is an aperture control ring the same as a stop down ring?

11-05-2006, 06:31 PM	#5
Tom Lusk Veteran Member Join Date: Sep 2006 Photos: Gallery Posts: 973 Original Poster	More info. The person is saying the stop down ring on the lens is stuck. Must be aperture setting ring???

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11-05-2006, 07:42 AM	#2
leaton Forum Member Join Date: Sep 2006 Location: Buford Georgia Photos: Gallery Posts: 91	I'm with you Tom. What is that? Sounds like a cross between an aperture ring and a depth of field preview button.

11-05-2006, 09:55 AM	#3
HogRider Veteran Member Join Date: Sep 2006 Location: Arizona, USA Photos: Gallery Posts: 608	Originally posted by Tom Lusk Dumb question. Is an aperture control ring the same as a stop down ring? Are you sure it is stop down and not step down ring? If you are sure sure it is stop down I can only think of the second ring that is usually part of older tele T mount lenses (like the Spiratone 400). You Preset the aperture with the aperture ring and then use the second ring to actually stop down to this setting. I am not sure if the correct term for this ring is stop down ring.

11-05-2006, 05:29 PM	#4
Jonas B Inactive Account Join Date: Sep 2006 Location: Göteborg, Sweden Posts: 810	Originally posted by Tom Lusk Dumb question. Is an aperture control ring the same as a stop down ring? There is nothing I know of called a "stop down" ring. Stopping down is an expression for closing the aperture. A "step down" ring an adapter making a small filter fit to a larger filter thread and a "step up" adapter makes a larger filter fit a smaller lens filter thread. (A step down adapter is most often not very useful as using it most often causes vignetting as the filter is too small for the lens. In what context was the expression "stop down" ring used?

11-05-2006, 06:42 PM	#6
Jonas B Inactive Account Join Date: Sep 2006 Location: Göteborg, Sweden Posts: 810	Originally posted by Tom Lusk The person is saying the stop down ring on the lens is stuck. Must be aperture setting ring??? Yes. A stupid way to call it.