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09-22-2010, 10:39 AM   #46
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2.8 is correct for #72B - my mistake. Ref actual pix.

H2


Last edited by pacerr; 09-23-2010 at 03:21 PM.
09-23-2010, 02:19 PM   #47
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QuoteOriginally posted by Ole Quote
Wikipedia has this lens as f/2.8 as opposed to model 52B, which is 2.5. The lens is missing from the adaptall.org, so how do we determine what's correct?
I have this lens and I can confirm the maximum aperture is f2.8. I would do a review of this lens but at the moment I am preoccupied with my latest eBay acquisition with unlisted defect.

Thanks,
09-23-2010, 03:47 PM   #48
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QuoteOriginally posted by Ole Quote
Wikipedia has this lens as f/2.8 as opposed to model 52B, which is 2.5. The lens is missing from the adaptall.org, so how do we determine what's correct?
Ole

My tamron SP booklet that came with my 24mmF2.5 shows the following
- 90mmF2.5 model 52B with 8/6 elements/groups
- Minimum distance from focus plane 0.39meters giving 1:2 reproduction, with
- focusing throw of 44 degrees 56 minutes from infinity to 1.5 meters and 293 degrees throw from 1.5 meters to 0.39 meters for a total focusing throw of 338 degrees.
- total weight 420g
- length 66mm
- diameter 64.5mm and
- 49mm filter

trust this helps, but perhaps there is another version also
09-24-2010, 08:39 PM   #49
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Thanks, Lowell. The lens in question was the 72B and we've got it straight now after my early miss-type.

Here's an interesting resource I hadn't seen before for the 90mm Macros:


Variations of Tamron 90mm Macro lenses


H2

09-27-2010, 10:00 PM   #50
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Another Adptall

Tamron 28-200mm F/3.8-5.6 LD Aspherical (IF) Super

Lens Type: Adaptall II
Focal Length: 28-200mm
Aperture Size: F/3.8-5.6

* Model - 171A
* Lens Construction (Groups/Elements) - 14/16
* Angle of View - 75-12.5
* Type of Zooming - Rotation
* Diaphragm Blade Number - 6
* Minimum Aperture - F/22
* Minimum Focus Distance - 31.5in. (0.8m)
* Macro Magnification Ratio - 1:6.3
* Filter Diameter - 72
* Weight - 15.8oz. (448gm)
* Diameter x Length - 2.9 x 3.0in. (74.5 x 77mm)
* Accessory - Lens hood
*

Discontinued 2006. Appears to be contemporary with latest SP lenses but doesn't have that title although listed as a 'Super" lens. Optically not the same as the AF 28-200/3.8-5.6 XR Di (A031). Somewhat common at ~$135.

H2
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