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18-270 Lenses
Sep 8, 2017 01:07:18   #
Chris T Loc: from England across the pond to New England
 
There are now two - the tried and true Tamron VC PZD - which has been around, for a while, now. Many have it, many have had good things to say about it. In fact, its only real fault seems to be its tendency to drop out to its maximum extension during use. Aggravating, but - to all intents and purposes - livable with. Pentax also has one. Is this the same lens, with the Pentax name on it? ... I think not, as users do not seem to be affected by the same plague. However, is it as good as the Tamron version? ... Or would the money be unwisely spent?

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Sep 8, 2017 11:21:25   #
Mr PC Loc: Austin, TX
 
I've been very happy with a Sigma 18-300, originally $579, there was a recent price drop to $399. I have the Nikon version and it is sharp and would give you a little more reach. The AF is fast, a good walking around lens.

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Sep 8, 2017 12:16:18   #
Chris T Loc: from England across the pond to New England
 
Actually, Mr PC ... I was going to do another post, regarding the 18-300 class. It will include yours, the two Nikons and even extend to the Tamron offerings - both the older 16-300, and the newer 18-400. I will see how this goes, and after your comment, and, perhaps - others like it - it might not be needed. Now, then ... I read somewhere that Sigma 18-300 vignettes, terribly - at all lengths. I gather, from you comment, you don't have that problem, though. Have you done a firmware upgrade via the USB port, or is this a very recent purchase?

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Sep 8, 2017 12:18:25   #
Chris T Loc: from England across the pond to New England
 
BTW, I may be wrong, I will check in a bit, but I don't believe that lens is available for Pentax, OR Sony alpha DSLR!

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Sep 9, 2017 06:25:00   #
jerryc41 Loc: Catskill Mts of NY
 
ChrisT wrote:
In fact, its only real fault seems to be its tendency to drop out to its maximum extension during use. Aggravating, but - to all intents and purposes - livable with.


That's common, and you learn to live with it.

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Sep 9, 2017 08:51:59   #
Tet68survivor Loc: Pomfret Center CT
 
I use the Tamron 16-300 on my Nikon D5200, and I haven't noticed any vignetting! Maybe I need to pay more attention!

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Sep 9, 2017 13:20:47   #
Mundj Loc: Richmond TX
 
ChrisT wrote:
There are now two - the tried and true Tamron VC PZD - which has been around, for a while, now. Many have it, many have had good things to say about it. In fact, its only real fault seems to be its tendency to drop out to its maximum extension during use. Aggravating, but - to all intents and purposes - livable with. Pentax also has one. Is this the same lens, with the Pentax name on it? ... I think not, as users do not seem to be affected by the same plague. However, is it as good as the Tamron version? ... Or would the money be unwisely spent?
There are now two - the tried and true Tamron VC P... (show quote)


I checked on the Pentax Forum. The reviewer for the Pentax 18-270 states the lens is a Tamron design and built in Tamron's China factory and is comparable to the Canon and Nikon versions. It does have the Pentax SMC coating but lacks the ability to manually override when in auto focus mode normally found on other Pentax zooms. He also noted that the lens when new does not suffer from zoom creep. Long term ability to resist zoom creep is TBD.

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Sep 9, 2017 14:41:41   #
Tet68survivor Loc: Pomfret Center CT
 
Mundj wrote:
I checked on the Pentax Forum. The reviewer for the Pentax 18-270 states the lens is a Tamron design and built in Tamron's China factory and is comparable to the Canon and Nikon versions. It does have the Pentax SMC coating but lacks the ability to manually override when in auto focus mode normally found on other Pentax zooms. He also noted that the lens when new does not suffer from zoom creep. Long term ability to resist zoom creep is TBD.


Hmm! The Nikon version specifically states "NOT" to manually over ride the auto focus, you must dis-engage the auto focus first! Is that what you are saying? If so, then things haven't changed!

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Sep 9, 2017 14:44:03   #
Tet68survivor Loc: Pomfret Center CT
 
Lens creep, my Tamron 16-300 is my everyday lens, after 3 years of constant use, over 20,000 photos no creep has been seen!

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Sep 9, 2017 16:41:51   #
Chris T Loc: from England across the pond to New England
 
MUNDI - thanks for your quite cohesive and extremely helpful comments ... I bow to you ....

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Sep 9, 2017 16:45:29   #
Chris T Loc: from England across the pond to New England
 
TET68Survivor ... the comment I made regarding vignetting at ALL lengths - referred to the Sigma 18-300. Comments made about LENS CREEP - referred to the Tamron 18-270 - a widely-known phenomenon. However, it is gratifying to discover there are none of these problems in the Tamron 16-300. Thanks for that tidbit ....

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Sep 9, 2017 16:48:31   #
Chris T Loc: from England across the pond to New England
 
MUNDJ - so, what you are saying is - whilst you CAN override the AF by turning the manual focus ring on the 18-270, this is not advisable on the Pentax version of (roughly) the same lens. Did I read you, correctly?

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Sep 9, 2017 16:51:01   #
Chris T Loc: from England across the pond to New England
 
MUNDJ ... I don't believe I've ever had occasion to resort to manual focus with the 18-270. But, if I did - I am sure I would have turned off the AF, first - as I always do, when going to manual focus, with any lens.

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Sep 10, 2017 02:53:01   #
Chris T Loc: from England across the pond to New England
 
TET68Survivor ... you may well have missed it, but MUNDJ indicated that most PENTAX lenses allow you to engage MANUAL focus, without turning off AF ... but that the Pentax 18-270 will NOT allow that ... read what he wrote again .....

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