What attracts me to try out this adaptall-2 lens with 104A that is a non-SP version of adaptall-2 lenses is the extra focal range that goes to 250mm and the lighter weight. I can't yet figure out as part of the lens barrel is made of plastic though the material is of heavy duty and I still feel strongly that the Tamron adaptall-2 lens is of unusual build quality that are up in par with the other SP adaptall-2 lens that I have a chance to try out. The lens surprises me with positive impressions as it is not well talked about in adaptall-2.org site and which noted it as above average performer. Specifically, I get lured into this with the comment about its lightweight. Speed is quite good in the range of f/3.8 to f/4.5. And guess what, it closely resemble the range in Pentax DA* 60-250mm f/4.0 and it is not too far off in the speed.with 2x conv
close up goes from 1:3.4 to 1:1.7
not bad for a $30 TC -- yet to try
Its close focus ratio is 1:3.4 which comes in handy for this zoom. When combined with Tamron SP 01F 2x Teleconverter, it can reach 1:1.7 in magnification ratio in minimum focusing distance of 1.2m or 4 feet. I like the lens starting from 250mm in the push-pull one touch zoom design that goes from 250mm to 75mm and it goes with clear scale of zoom position in 75mm, 90mm, 105mm, 135mm, 180mm and 250mm. All happen to be the critical focal point that will work well with the SR focal length setup on my Pentax K20D.close up goes from 1:3.4 to 1:1.7
not bad for a $30 TC -- yet to try
All test shots are done hand-held
1/100 sec, f/8.0, 250mm, iso 400, 0 Ev
0.3 sec, f/4.0, 75mm, iso 640, 0 Ev
1/13 sec, f/4.5, 250mm, iso 500, 0 Ev
intentional out-of-focus to see bokeh
1/8 sec, f/4.5, 250mm, iso 800, -1 Ev
1/20 sec, f/4.5, 75mm, iso 640, 0 Ev
With the Tamron SP Flat-field 2x teleconverter mounted, I have a difficult time in obtaining focus lock and I switched on MF to make the shots. Bokeh in out of focus shot are more rounded than without and I can't explain it yet.
1/50 sec, f/8.0, 500mm, iso 500, 0 Ev
with Tamron SP 01F 2x TC
with Tamron SP 01F 2x TC
1/5 sec, f/4.5, 500mm, iso 800, -0.7 Ev
with Tamron SP 01F 2x TC
intentional out-of-focus to see bokeh
ringed light is more rounded when TC is mounted
why the difference
with Tamron SP 01F 2x TC
intentional out-of-focus to see bokeh
ringed light is more rounded when TC is mounted
why the difference
Initial Impressions & Notes
- Too early to draw conclusions but I am very impressed in its lightweight and wide open aperture performance
- Ease of use and the extra reach to 250mm gets the most attention from me especially when its speed is so close to Pentax DA* 60-250mm f/4.0.
- As said, speed in f/3.8 -4.5 is plenty for this zoom
- I have not tested its close up in 1:3.4 magnification setting
- I find it a charming lens to use in panning car movement at night as it is lightweight and its Tamron adaptall-2 focusing ring wins my heart again in manual focusing that is precise, smooth and allow fast focusing in reaction to scene -- top notch in manual focusing
- Use with 2x adapter does has the problem in losing too much light making it difficult to obtain focus at night. I will re-test the use of 01F TC in day time to draw conclusion
- 500mm test pictures with 01F 2x TC are reasonable but heavy cropping from 250mm test shots yield about similar and close results. I don't have trained eyes to see the advantage. But one thing is for sure, with the 2x TC mounted, you feel more excited in taking the pictures of the moon filling the frame way better than without the TC mounted
- A value lens for sure to be paid attention. My copy is in mint condition.
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