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09-08-2012, 04:03 AM   #46
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If it were WR I'd consider it.

09-08-2012, 04:44 AM   #47
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QuoteOriginally posted by Docrwm Quote
SDM and $900, no thanks

Makes me glad I have an 18-250 with good old fashioned, and reliable, screw drive technology. Now, if it's really DC technology like the 18-135WR that is a completely different story.
SDM is already 40+ years old so when does something become old fashion?
brush less DC is 50 years old.
09-08-2012, 05:25 AM   #48
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Why make the Q zoom f2,8? Why not 1,8? The big advantage with the Q system should be small and fast glass, not small and "slow" glass.
09-08-2012, 05:25 AM   #49
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SDM zoom lens for 1.5x crop K-mount bodies , no thanks , I would prefer to use my 28-300mm Tamron on a FF K-mount body.

09-08-2012, 05:29 AM   #50
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QuoteOriginally posted by fikkser Quote
Why make the Q zoom f2,8? Why not 1,8? The big advantage with the Q system should be small and fast glass, not small and "slow" glass.
They should make fast primes for the Q.
09-08-2012, 05:31 AM   #51
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QuoteOriginally posted by jogiba Quote
They should make fast primes for the Q.
sure, but if I could have a fast zoom I'd get it.
09-08-2012, 05:36 AM   #52
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QuoteOriginally posted by fikkser Quote
Why make the Q zoom f2,8? Why not 1,8? The big advantage with the Q system should be small and fast glass, not small and "slow" glass.
f2.8 *is* a fast zoom. What are you smoking?
09-08-2012, 06:10 AM   #53
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Just what do those soccer mums look like?
Sorry, off topic. It's to be hoped a new 18-270 zoom has fixed the lens creep problems of the DA 18-250.
While trying this lens out recently at a work-dinner, there were gasps from the ladies at the table when I turned the zoom ring and made the lens extend dramatically. I could only make one statement, "That happens to me all the time when I don't expect it".

Regards

09-08-2012, 06:14 AM   #54
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QuoteOriginally posted by Sandy Hancock Quote
f2.8 *is* a fast zoom. What are you smoking?
Not for such a small sensor, they can easily make f/2 and maybe even faster but they would be premium/pro level stuff though not something really for the Q
09-08-2012, 06:16 AM   #55
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QuoteOriginally posted by Sandy Hancock Quote
f2.8 *is* a fast zoom. What are you smoking?
Whats the point with a 2,8 zoom for the Q system? It's already too big to fit comfortably in the pocket, why not make it just a little bigger and use the advantages of the small sensor = small fast lenses. What did your mom smoke? f1,8 would be very nice.
09-08-2012, 06:29 AM   #56
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QuoteOriginally posted by fikkser Quote
Whats the point with a 2,8 zoom for the Q system? It's already too big to fit comfortably in the pocket, why not make it just a little bigger and use the advantages of the small sensor = small fast lenses. What did your mom smoke? f1,8 would be very nice.
R&D and production costs, I guess. And as far as "pocketable" is concerned, I think Pentax just doesn't want the Q lenses to look like Sony E-mount lenses on the NEX... a "beercan-on-a-matchbox". Only compacts with retracting fixed lenses can ever be pocketable, at least with today's technology...
09-08-2012, 06:34 AM   #57
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QuoteOriginally posted by fikkser Quote
Whats the point with a 2,8 zoom for the Q system? It's already too big to fit comfortably in the pocket, why not make it just a little bigger and use the advantages of the small sensor = small fast lenses. What did your mom smoke? f1,8 would be very nice.
To be fair.... there is no zoom lens with f1.8 aperture (or there are?), as far as I know. A zoom lens with constant F2.8 is difficult to make and its expensive.
09-08-2012, 07:11 AM   #58
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QuoteOriginally posted by Alizarine Quote
R&D and production costs, I guess. And as far as "pocketable" is concerned, I think Pentax just doesn't want the Q lenses to look like Sony E-mount lenses on the NEX... a "beercan-on-a-matchbox". Only compacts with retracting fixed lenses can ever be pocketable, at least with today's technology...
But that is with a bigger sensor.
We are talking about a system where 8mm is normal so with an 8mm opening we would already have f/1
With Sony you need 30mm and so a 30mm opening, big difference!
09-08-2012, 07:14 AM   #59
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QuoteOriginally posted by Sandy Hancock Quote
f2.8 *is* a fast zoom. What are you smoking?
The previous poster may have a good point. F2.8 zooms ARE fast if we are talking longer flange to film/sensor distances and larger format sensors/films. But it makes sense to compare Q lenses to c-mount lenses made for 16mm movie cameras. They can have huge zoom ranges and yet very fast apertures (16-160mm f1.8; 22.5-90mm f1.5; etc.)

F2.8 does sound slow in comparison. Perhaps this indicates it is a fake. Or, if the black dot setting is macro, perhaps that accounts for the necessary "slowness".
09-08-2012, 07:20 AM   #60
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QuoteOriginally posted by cheekygeek Quote
The previous poster may have a good point. F2.8 zooms ARE fast if we are talking longer flange to film/sensor distances and larger format sensors/films. But it makes sense to compare Q lenses to c-mount lenses made for 16mm movie cameras. They can have huge zoom ranges and yet very fast apertures (16-160mm f1.8; 22.5-90mm f1.5; etc.)

F2.8 does sound slow in comparison. Perhaps this indicates it is a fake. Or, if the black dot setting is macro, perhaps that accounts for the necessary "slowness".
So if the crop factor would make the FL roughly 5.6x, how does that affect the "equivalent" aperture value to APS-C, f1.5 would be what roughly?
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