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Finally

Focal length = 191mm, f/5, iso 1250, 1/160 s

I am very happy with the lens. The conditions were relatively dark and I had to use iso 1250 for most and relatively low shutter speeds. My 300mm f/2.8 II would have been better, but the Tammy was good enough, and pretty stunning on occasions, and I put it through most of its focal length range.
 

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Nice work Alan and Jack!

Alan, the zebra dove is the most impressive from the standpoint of resolution combined with long focal length. The 600mm shot below that post, is the weakest example of resolution...it's quite soft. The lens can possibly do better I suppose, but how much better at 600mm?

It seems to me the lens is the most impressive below 450mm, which is not unusual.

I forgot to notice, were all of these hand-held, or was it a tripod, monopod, or other support?
 
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AlanF said:
All hand held. The 600mm shots were at 1/40 - 1/250 s, which is on the slow side. An f/2.8 would have given extra edge.

Hmm, I think the slow shutter speed might be a big factor in that shot at 600mm, even with IS. If you want razor sharpness at the pixel level hand-held at 600mm, you ideally need over 1/1250, held very steady (say on a monopod) with IS switched off...in my opinion (at least on a stationary subject...on moving subjects it's always best to have IS on and in panning mode for every shot regardless of shutter speed). No I've not used this lens, but it's been true of all telephoto lenses I've owned or used. At 300mm, or especially shorter than that, you can easily achieve maximum sharpness at shutter speeds 1/250 and even slower hand held, with the IS on. But not at longer than 400, or especially 600mm. All IS systems, even the best ones, produce a bit of vibration that adds anywhere from a very subtle blur, to a noticeable one...when viewing at 100%. If viewing at 50%, then the effect can't be seen at all.
 
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Agreed that higher speeds are desirable. However, here is one example from two days ago at 600mm, 1/25 s, iso 640, hand held - again reduced to 1200px for uploading and a 100% crop.
 

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This could be a "bulbul". I saw similar birds in Hong Kong Wetland Park.
-r

AlanF said:
Focal length = 213mm, f/6.3, iso 1250, 1/40 s
 

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HankMD said:
lion rock said:
This could be a "bulbul". I saw similar birds in Hong Kong Wetland Park.
-r

AlanF said:
Focal length = 213mm, f/6.3, iso 1250, 1/40 s

This seems to be a Black-crested Bulbul (Pycnonotus flaviventris).

Hank
can you identify the other Asian birds I posted two pages back?
Thanks
Alan
 
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