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Tamron Adaptall T-300 Adaptall 300mm F5.6

Reviews Views Date of last review
1 8,177 Thu January 29, 2015
Recommended By Average Price Average User Rating
100% of reviewers $25.00 8.00
Tamron Adaptall T-300 Adaptall 300mm F5.6

This is the original Adaptall 300mm f5.6. Based on the adaptamatic 300mm f5.6, it has identical specs, a similar tripod mount (lacking on the succeeding versions) and the distinctive perspex window over the focus distance scale. It was superseded by the CT-300, which is reviewed separately.
Focus turns the opposite way to Pentax, and minimum focus to infinity is 270 degrees; 3/4 of a turn. The front element rotates as you focus. The lens has a built-in lens hood and tripod mount/collar.
The optical design is suspected to be the same as for the Adaptamatic 300mm f5.6.
The lens has an M/A switch, so can easily be used in Aperture Priority mode on a Pentax DSLR without a PK/A adapter.

Weight: 869 g including Adaptall mount
Length: 22 cm including mount
Filter size: 62mm
Maximum Diameter (including tripod mount): 8 cm
Aperture blades: 9 straight
Minimum focus distance: 2.4 m
Maximum aperture: 5.6
Minimum aperture: 32

Accepts SP 2X tele-converter #01F and SP 1.4X tele-converter #140F. Note: TC's are reviewed in miscellaneous lenses - TC's.
Mount Type: Third-party (adapter required)

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New Member

Registered: February, 2012
Posts: 15

1 user found this helpful
Lens Review Date: January 29, 2015 I can recommend this lens: Yes | Price: $25.00 | Rating: 8 

Pros: Lovely handling, tripod mount
Cons: Slow

Bagged this on eBay to add to my Adaptall collection.

The best thing about it is the handling. Focusing is beautifully smooth, and with 3/4 of a turn, it is easy to nail the focus. The tripod mount is useful, especially considering that at f5.6 maximum aperture this lens is quite slow. With the M/A switch, Aperture Priority is straightforward.

Image quality is pretty good. I have copies of the Adaptall CT-300 (the successor to this lens) and the Adaptall SP 54B, and this is certainly in the same ball-park image-wise. Pixel peeping, with my copies, I would say the CT-300 is the best, then this lens, then the SP 54B. The distinction may just be down to focus accuracy, of course. Where this lens distinguished itself was the consistency of the images I produced with it, a tribute perhaps to the long focus throw.

I like the bokeh, nice and smooth.

The built-in lens hood is very deep, a benefit of the large overall lens dimensions.

However, the image quality of my Pentax-F 100-300mm, Pentax FA 100-300mm and Sigma 70-300mm zooms can also be in the same ball park when they are zoomed out to 300 mm, if I take the trouble to fine tune the focus manually with an eye-piece magnifier. This lens weighs more than any of those zooms.

I'm not sure when I will use it, but it is a nice object, and it produces nice images, so I recommend it.
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