300mm lens for the K7


SteveLedger

Link Posted 26/06/2012 - 13:08
I'm looking at getting a 300mm lens for the K7.
Right now I'm looking at the Sigma 70-300mm F4-5.6 DG OS.
Anyone have experience shooting with his lens on any Pentax dSLR?
Obviously the in-camera SR would be turned off when mounting this lens as the Sigma OS would mean an advantage being able to review stabilization in the viewfinder.
Another potential advantage is the extra reach this full frame lens would give on the K7 (according to the Sigma website up to 450mm on an APS-c sensor camera)
It's also within my budget..

gartmore

Link Posted 26/06/2012 - 13:37
A 300mm lens is and always will be a 300mm lens. What Sigma mean is that it would give the equivalent field of view of 450mm when used on a 35mm film camera.
Ken
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -

SteveLedger

Link Posted 26/06/2012 - 13:47
Hi,

Thanks for replying.
The wording on the Sigma home page is

Quote:
Designed for use with full frame digital SLR cameras. May also be used with smaller APS-c size sensors with a corresponding effective increase in focal length to about 100 to 450mm with most cameras

Is this the same as what you are saying?
Not that it matters a great deal, 300mmm is fine anyway.

petrochemist

Link Posted 26/06/2012 - 13:51
sledger wrote:
Another potential advantage is the extra reach this full frame lens would give on the K7 (according to the Sigma website up to 450mm on an APS-c sensor camera)

Full frame lens make abbsolutly no difference to the reach you'll get. Yes the K7 will crop the edges of a full frame image giving a similar field of view to 1.5 times the focal length acheives on a full frame, but that applies to all lenses.
The Pentax DA55-300 will give you just as much reach, at the long end & goes a little wider. I havent used the Sigma70-300 but I'm fairly sure it will be significantly heavier.

I use the Bigmos on my K7 (weight can be a real issue) I'm not convinced the stabilized viewfinder makes that much difference, and switching the K7's SR off is a bit of a pain if you're switching between lenses a lot. Mind you my other 500mm+ lenses have all been manual focus so I've not been trying to hold a focus point on target, so the OS might be worth the extra hassle, but I've never missed it on any of my 300's
Mike
.
Pentax:K5ii, K7, K100D, DA18-55, DA10-17, DA55-300, DA50-200, F100-300, F50, DA35 AL, 4* M50, 2* M135, Helicoid extension, Tak 300 f4 (& 6 film bodies)
3rd Party: Bigmos (Sigma 150-500mm OS HSM),2* 28mm, 100mm macro, 28-200 zoom, 35-80 zoom, 80-200 zoom, 80-210 zoom, 300mm M42, 600 mirror, 1000-4000 scope, 50mm M42, enlarger lenses, Sony & micro 4/3 cameras with various PK mounts, Zenit E...
Far to many tele-converters, adapters, project parts & extension tubes etc.

.[size=11:].Flickr• WPF• Panoramio
Last Edited by petrochemist on 26/06/2012 - 13:53

SteveLedger

Link Posted 26/06/2012 - 13:58
Cheers Mike,
Understood..

BTW: Toggling SR off/on is really too simple.
Press the Info button>>Rotate rear dial>>Press info button
(I don't change lenses a lot)

petrochemist

Link Posted 26/06/2012 - 16:33
sledger wrote:
BTW: Toggling SR off/on is really too simple.
Press the Info button>>Rotate rear dial>>Press info button
(I don't change lenses a lot)

The K100d was simple (a switch on the back) with the K7 it still takes a few seconds - IIRC you have to rotate the rear dial 3or4 clicks to get to the right page then go up one to get to the bottom entry & toggle that. (A couple of times I've toggled it with the side button then pressed OK only to see it change back.
Until a couple of weeks ago I never touched it, as SR is turned off anyway when the timer is used (with the tripod). It's a shame the camera does auto detect the in lens OS - then I wouldn't have to remember to switch it
Mike
.
Pentax:K5ii, K7, K100D, DA18-55, DA10-17, DA55-300, DA50-200, F100-300, F50, DA35 AL, 4* M50, 2* M135, Helicoid extension, Tak 300 f4 (& 6 film bodies)
3rd Party: Bigmos (Sigma 150-500mm OS HSM),2* 28mm, 100mm macro, 28-200 zoom, 35-80 zoom, 80-200 zoom, 80-210 zoom, 300mm M42, 600 mirror, 1000-4000 scope, 50mm M42, enlarger lenses, Sony & micro 4/3 cameras with various PK mounts, Zenit E...
Far to many tele-converters, adapters, project parts & extension tubes etc.

.[size=11:].Flickr• WPF• Panoramio

Algernon

Link Posted 26/06/2012 - 16:49
The Sigma 70-300mm F4-5 won't have SR in Pentax fitting.
Unless they have recently added it. The Pentax 55-300mm
is much better.
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi

Frogfish

Link Posted 26/06/2012 - 18:15
Assume you are looking for zooms (which are not at their best at 300mm) and not primes (which are)

The 55-300 is the best consumer zoom available for Pentax - though it's better at 240-260mm and cropping than at 300mm (the difference from ca. 250mm to 300mm is really minimal in effect terms).
http://frogfish.smugmug.com/ Pentax. Pentax DA*300/4, Cosina 55/1.2, Lens Baby Composer Pro & Edge 80, AFA x1.7, Metz 50 af1.
Nikon. D800. D600. Sigma 500/4.5, Nikon 300/2.8 VRII, Sigma 120-300/2.8, Zeiss Distagon ZF2 21/2.8, Zeiss Distagon ZF2 35/2.0, Sigma 50/1.4, Nikkor 85/1.8, Nikon TC20EIII, Nikon TC14EII, Kenko x1.4, Sigma 2.0

davidstorm

Link Posted 26/06/2012 - 20:51
I have both lenses and the Sigma 70-300 never gets used as it is inferior to the Pentax 55-300 in terms of image quality. Also, because I have the DA L version of the 55-300 it is much lighter than the Sigma and this suits me.

Regards
David
Flickr

Nicola's Apartments, Kassiopi, Corfu

Some cameras, some lenses, some bits 'n' bobs

johnha

Link Posted 26/06/2012 - 21:45
I have an old Sigma 70-300 f/4-5.6 APO Super from the late '90s which has pretty much the same profile, markings etc. I suspect this is basically the same lens but with one less 'APO' element?

I haven't really tested my 'APO' version but would say it was OK optically for this type of zoom. The AF isn't brilliant either but I can't compare to comparable screw-driven zooms of similar lengths.

I don't know how much these are compared to other options, but if I was looking at Sigma's, from these links from Sigma's website, I'd go for the DG APO as you have SR, it looks better MTF wise, has two SLD elements instead of one and should be cheaper:

APO DG info: link
APO DG MTF: link

DG OS info: link
DG OS MTF: link

Or there's a Sigma 135-400 APO for sale in the classifieds (not mine).

John.
PPG Flickr
Last Edited by johnha on 26/06/2012 - 21:47

senn

Link Posted 26/06/2012 - 22:55
try Pentax 55-300 DA before opting for Sigma, .. I'm almost sure you're not about to regret it ..

regards,
senn
my flickr gallery
my PPG

SteveLedger

Link Posted 26/06/2012 - 23:29
Well I can't try lenses before I buy them. Maybe some folks have this luxury, but not here.
So I need opinions from others who use the lens and possibly samples?
I already have a PENTAX 18-250mm DA lens which is frankly AUD$800+ of rubbish. Annoying barrel creep, slow AF (laughably slow in LV) and soft focus in the corners.
I've also heard that the Pentax 18-250mm and 55-300mm are re badged TAMRONS

I have a 30mm Sigma lens which just is fantastic in terms of IQ and build. So I'm a little bias towards Sigma over Pentax.

As mentioned in the OP, the Sigma is within my budget. I know there are better lenses, be silly not to - but they are outside of my budget therefore not an option at all.

Thanks for the responses so far

davidstorm

Link Posted 27/06/2012 - 00:03
I'm not sure that samples would help too much as the quality of these will depend as much, if not more, on the quality of the photographer as it does on the lens. I have offered a view from someone who owns both the Sigma 70-300 DG APO and the Pentax 55-300 and so I base the advice on direct experience with my Pentax cameras.

It seems to me you may already have made up your mind, despite most on this post advising that the 55-300 is significantly better than the Sigma. I don't think it is a re-badged Tamron, but even if it is, it offers better image quality (sharpness, colour rendering, contrast).

Best wishes
David
Flickr

Nicola's Apartments, Kassiopi, Corfu

Some cameras, some lenses, some bits 'n' bobs

SteveLedger

Link Posted 27/06/2012 - 00:54
Does the Pentax 55-300mm have barrel creep?

Mike Pearson

Link Posted 27/06/2012 - 04:12
No barrel creep on my Pentax 55-300

Here's an Eastern Screech Owlet taken a couple of weeks ago - handheld with the K20D.

link

Mike
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