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03-17-2013, 08:29 PM   #106
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Well, here's my tuppence worth

QuoteOriginally posted by mackloon Quote
Hello -

First off, I apologize for reviving an older thread, but I am looking at making a purchase of either the 50-500mm Sigma or the 120-400mm Sigma to pair with my K-r, which will later be upgraded to the K-5 or better...depending on budget.

So, I was wondering if people had updates on these two lenses or if anyone would be willing to post their more recent personal experiences.

I originally was planning on the 150-500mm, but the copy I received had focusing issues so it went back to the seller. In addition, that lens is huge. Not quite as heavy as the 50-500 OS, but about 1.5 inches longer. With this being said, I am looking at either of these other 2.

1.) I was wondering how the 1.4x TCs work on the 120-400mm OS lens. I would like to reach at least 500mm, and the 1.4x will get me to 560mm (x1.5CF 840mm). What would the max aperture be on this lens paired with the Tamron 1.4 TC? Is there a better TC on the market for this lens that will work in AF mode? I figured the Sigma APO x1.4 would work but when I called Sigma they told me that it would only work in Manual Mode. If you have time to fine tune manual is great...but many times you only get that split second, and therefore the AF is essential to me.

2.) Would anyone recommend the 50-500mm over the 120-400mm? I know that the weight is about 200g+ than the 120-400mm, and the cost is $600+.

Anywho? Just looking to get as much information on these two, because I will have to order soon.

LBA in full effect

-mackloon
Sigma TC's are designed for use with IF lenses (internal focus) which have no rear element movement and usually AF is only retained with a maximum F4 aperture. They wont be any good with a standard zoom lens, and apart from that, the IQ will be destroyed as it's not brilliant to begin with and AF speed will be reduced to a crawl (no good at all for a moving subject). You will be far better off with a 300mm F/2.8 prime or a Sigma 100-300mm F/4 both of which can utilise the Sigma TC's and are both far superior to the 120-400 (OS + non-OS), 150-500 and 50-500. As for the Sigma 150-500mm, you'll be better off with the BIGMA 50-500mm which has better IQ. Also remember that any in-lens OS will draw it's power from the camera battery, so ideally use a VG with a second battery installed and/or take some spares if out in the field for long periods, else turn off in-lens OS in lieu of in-camera OS to save battery power. If you can't source or afford a 100-300/4 or 300/2.8, I would recommend the 120-400 OS HSM, then the 50-500. The 150-500 would be a decision of last resort and only IF it's absolutely necessary because nothing else is available and needs must, but there are better options out there.

07-15-2013, 05:46 PM   #107
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QuoteOriginally posted by Pirate Quote
Sigma TC's are designed for use with IF lenses (internal focus) which have no rear element movement and usually AF is only retained with a maximum F4 aperture. They wont be any good with a standard zoom lens, and apart from that, the IQ will be destroyed as it's not brilliant to begin with and AF speed will be reduced to a crawl (no good at all for a moving subject). You will be far better off with a 300mm F/2.8 prime or a Sigma 100-300mm F/4 both of which can utilise the Sigma TC's and are both far superior to the 120-400 (OS + non-OS), 150-500 and 50-500. As for the Sigma 150-500mm, you'll be better off with the BIGMA 50-500mm which has better IQ. Also remember that any in-lens OS will draw it's power from the camera battery, so ideally use a VG with a second battery installed and/or take some spares if out in the field for long periods, else turn off in-lens OS in lieu of in-camera OS to save battery power. If you can't source or afford a 100-300/4 or 300/2.8, I would recommend the 120-400 OS HSM, then the 50-500. The 150-500 would be a decision of last resort and only IF it's absolutely necessary because nothing else is available and needs must, but there are better options out there.
Late re-answering that thread as well ...

Funny you say that the Siggy 50-500 has better IQ than the Siggy 150-500.
After much researching and viewing dozens of sample shots, (inlcuding my own with the 150-500), I would say that this is a very personal call/observation when trying to determine which is "better".

Some owners of the 150-500 swears by its better IQ at the long end, some don't!
Some owners are happy with their 50-500, some aren't.
Does it also mean that perhaps some owners had better copies of either lenses?

At the end of the day ... (as the saying goes) : it is all relative.

JP
07-15-2013, 06:36 PM   #108
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I had the non- OS version, it was defective, then they sold me the OS version because they shipped me the wrong lens, I didn't like the IQ so I sent that back and got an DA*60-250 and later acquired an A 400 ƒ5.6 that works great with the Pentax 1.7 TC. Auto focus on a 680mm f 9.3 lens that is relatively sharp. Very sharp compared to the 120-400 and for less than $800. Needless to say I can't recommend the lens...mine was good for objects close to the camera, not so good for distant objects... the A-400 is much better and the DA* 60-250 leaves it in the dust.
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