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Hmm, not sure what you are looking at. The lens mount is huge! It looks to be ~2.3" inner diameter, where a CFD is ~1.7".Macro_Cosmos wrote:The mount looks tiny, it's certainly not an FX lens and I'm 95% sure it can't even cover DX.
$40k?
Probably not even worth $1500. There's plentiful weird lenses of such that worth about really nothing. Holy grail? Lol.
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FYI,
Using the measurement tool in Photoshop and calibrating it to the ruler next to the lens in the Ebay photo the OD of the rear of the lens is 1.97 inches or 50mm. EOS mount is something like 65mm (from memory).
When I enlarged the image to measure the lens, it looks like the rear of the lens is warped or bent, at least in the Ebay photo.
That kind of thing can affect image quality I would guess.
Using the measurement tool in Photoshop and calibrating it to the ruler next to the lens in the Ebay photo the OD of the rear of the lens is 1.97 inches or 50mm. EOS mount is something like 65mm (from memory).
When I enlarged the image to measure the lens, it looks like the rear of the lens is warped or bent, at least in the Ebay photo.
That kind of thing can affect image quality I would guess.
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I made my measurements a bit differently. Here's a 100% crop of the ruler between 9 and 10 inches. The distance between 9 and 10 is 108pixels:RobertOToole wrote:FYI,
Using the measurement tool in Photoshop and calibrating it to the ruler next to the lens in the Ebay photo the OD of the rear of the lens is 1.97 inches or 50mm. EOS mount is something like 65mm (from memory).
When I enlarged the image to measure the lens, it looks like the rear of the lens is warped or bent, at least in the Ebay photo.
That kind of thing can affect image quality I would guess.
And here is a crop of the lens mount, not across the lens, but the actual opening in the mount breech clamp. It is 260 pixels across:
So the breech clamp opening is ~2.4". Corresponding dimension of CFD and EOS are both ~2".
The 120mm Makro Symmar is indeed a great buy. Wish I could use such long lenses in my system, but I'm working distance challenged. I've had great luck with the 80mm version though!
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Hi Ray,
Sorry I quoted mm, should have used inches. Also we are probably measuring different sections in the image.
Just measured my MP-E 65 sitting here, the female side EOS flange outer diameter is 64mm or 2.5 inches, the male side, flange to flange is 53mm or 2 in.
FYI for the future:
How To Measure in Photoshop CS with the Ruler Tool
Open PS, open an image.
Go to Menu>Image>Analysis>Set measurement Scale>Custom
Drag the curser to measure the reference distance, 1 inch on a ruler for example, then change the logical units to inch, or mm as in the below.
Press Ok.
Now if you drag the cursor across something it shows the new scaled measurement data.
If you can remember, this is a quick way to find magnification, just dont forget to shoot an image of a ruler in the first place.
Sorry I quoted mm, should have used inches. Also we are probably measuring different sections in the image.
Just measured my MP-E 65 sitting here, the female side EOS flange outer diameter is 64mm or 2.5 inches, the male side, flange to flange is 53mm or 2 in.
FYI for the future:
How To Measure in Photoshop CS with the Ruler Tool
Open PS, open an image.
Go to Menu>Image>Analysis>Set measurement Scale>Custom
Drag the curser to measure the reference distance, 1 inch on a ruler for example, then change the logical units to inch, or mm as in the below.
Press Ok.
Now if you drag the cursor across something it shows the new scaled measurement data.
If you can remember, this is a quick way to find magnification, just dont forget to shoot an image of a ruler in the first place.
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