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littledrawe · 10-04-2015, 09:04 PM

Is the area between the aperture ring and the focus ring fixed, as in it does not move or turn? If so does anyone have the lens that could measure that area with calipers to get a mm measurement?

**bkpix** · 10-04-2015, 10:06 PM

Yes, it's fixed. I assume you want the diameter at that point, thinking to add a tripod foot? I don't have calipers, but eyeballing it with a ruler I'd put it at 70mm. If you mean longitudinally, along the lens axis, it's 39mm.

littledrawe · 10-04-2015, 10:44 PM

Yes, I want to try to get something around it for some kind of tripod attachment. I have a couple ideas so the outside diameter would be the most helpful figure. I'd really appreciate the info if anyone has the ability to do so. I figured since the filter ring was 77mm and the diameter of the lens seems consistent down the length that it has to be around that measurement.

littledrawe · 10-05-2015, 05:55 AM

@dcshooter, it is the 645 A*300mm that I am looking at for this application. I should have clarified that in the first post, I apologize!

**iCrop** · 10-05-2015, 09:11 AM - **1 Like**

As luck would have it, I received a copy of the SMC Pentax-A* 645 1:4 300mm ED(IF) from KEH this past Saturday. I think I'm going to like this one on the 645Z.

The measurement you're looking for is 2.9755 Inches = 75.578 mm, and it is fixed.

If you find a tripod mount for it, please let me know, I might be interested in getting one myself.

Good luck.

littledrawe · 10-05-2015, 12:49 PM

I have an idea, thanks for the measurement, that should help me figure it out.

10-04-2015, 09:04 PM	#1
littledrawe Veteran Member Join Date: Jan 2010 Location: Red Rock Photos: Gallery \| Albums Posts: 2,514	*A 300mm/4 question?** Is the area between the aperture ring and the focus ring fixed, as in it does not move or turn? If so does anyone have the lens that could measure that area with calipers to get a mm measurement?

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10-04-2015, 10:06 PM	#2
bkpix Site Supporter Join Date: Feb 2010 Location: Creswell, Oregon Photos: Albums Posts: 570	Yes, it's fixed. I assume you want the diameter at that point, thinking to add a tripod foot? I don't have calipers, but eyeballing it with a ruler I'd put it at 70mm. If you mean longitudinally, along the lens axis, it's 39mm.

10-04-2015, 10:44 PM	#3
littledrawe Veteran Member Join Date: Jan 2010 Location: Red Rock Photos: Gallery \| Albums Posts: 2,514 Original Poster	Yes, I want to try to get something around it for some kind of tripod attachment. I have a couple ideas so the outside diameter would be the most helpful figure. I'd really appreciate the info if anyone has the ability to do so. I figured since the filter ring was 77mm and the diameter of the lens seems consistent down the length that it has to be around that measurement.

10-05-2015, 05:55 AM	#4
littledrawe Veteran Member Join Date: Jan 2010 Location: Red Rock Photos: Gallery \| Albums Posts: 2,514 Original Poster	@dcshooter, it is the 645 A*300mm that I am looking at for this application. I should have clarified that in the first post, I apologize!

10-05-2015, 09:11 AM - 1 Like	#5
iCrop Site Supporter Join Date: Mar 2007 Location: Tucson Photos: Gallery Posts: 292	As luck would have it, I received a copy of the SMC Pentax-A* 645 1:4 300mm ED(IF) from KEH this past Saturday. I think I'm going to like this one on the 645Z. The measurement you're looking for is 2.9755 Inches = 75.578 mm, and it is fixed. If you find a tripod mount for it, please let me know, I might be interested in getting one myself. Good luck.

10-05-2015, 12:49 PM	#6
littledrawe Veteran Member Join Date: Jan 2010 Location: Red Rock Photos: Gallery \| Albums Posts: 2,514 Original Poster	I have an idea, thanks for the measurement, that should help me figure it out.

A* 300mm/4 question?

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