FattyMCJ:Interesting points about the pentax models,I have never really taken a second look at them. Mostly because it is hard to find good second hand lenses and accesories. Are you saying that both the pentax models and the D90 have in-camera image stabilization? (or shake reduction or VR or wahtever it's called) Because that is completely news to me.
No, I was saying that both Pentax models have internal SR (not the D90) while all three (Kx, K7, D90) all have an internal focusing motor. Hopefully that clarifies my statement.
As far as second hand lenses being hard to find, I don't agree. PentaxForums.com is an EXCELLENT resource for good quality second hand lenses, sold by other "Pentaxians", not to mention
eBay and Craigs list.
Adorama and
B&H both carry the full gambit of new lenses and accessories also.
There is also a full Lens Review database complied by actual USERS of each lens, both Pentax and 3rd party
HERE that you can check out.
A selection of 30+ years worth of K mount lenses AND M42 mount lenses (Super Takumar comes to mind) is hard to argue against IMO.
Are you aware of the technical limitations from having shake reduction in the camera body rather than in the lens?
Actually, no. Please elaborate!
In-Lens Image Stab/Shake Reduction said:
It works by using a floating lens element that is moved orthogonally to the optical axis of the
lens using electromagnets.
[3] Vibration is detected using two piezoelectric
angular velocity sensors (often called
gyroscopic sensors), one to detect horizontal movement and the other to detect vertical movement.
[4] As a result, this kind of image stabilizer only corrects for pitch and yaw axis rotations,
[5] and
cannot correct for rotation around the optical axis. Some lenses have a secondary mode that counteracts vertical camera shake only. This mode is useful when using a
panning technique, and switching into this mode depends on the lens; sometimes it is done by using a switch on the lens, or it can be automatic.
The system also draws power from the battery, so de-activating it when it is not needed will extend the time before a recharge is required.
One of the main disadvantages about lens-based image stabilization is the higher price tag that comes with it;
not all lenses that Nikon and Canon manufacture are image stabilized.
Also, because light passing through the lens is shifted from its true optical path when it projects out the rear element onto the sensor, poor 'Bokeh' can result.[9] This is the subjective quality, but highly valued by professional photographers, of the out-of-focus area around an image.
In-body image stabilization does not have this problem because the light is not altered, only the sensor's position.
vs.
In-Body Image Stab/Shake Reduction said:
The advantage with moving the image sensor, instead of the lens, is that the image will be stabilized regardless of what lens is being used. This allows the stabilization to work with any lens the photographer chooses and reduces the weight and complexity of the lenses. The price value is often seen in the ability to buy lower cost lenses from makers like Tamron and Sigma and still have stabilized images. There are popular lens types that have no in lens stabilization option where sensor based stabilization can be very useful.
This also allows one to use old manual lenses with this stabilization feature.
One of the primary disadvantages of moving the image sensor itself is that the
image projected to the viewfinder is not stabilized. However, this is not an issue on cameras that use an
electronic viewfinder (EVF), since the image projected on that viewfinder is taken from the image sensor itself.
Another disadvantage of moving the sensor instead of the lens is that only the main imaging sensor is moved, but the autofocus sensor is not moved. This means that camera shake can lower the performance of the autofocus system in bad light. This is an issue only with DSLRs which have a dedicated phase-detection autofocus sensor, not an issue with smaller cameras which use the main sensor for contrast-detection autofocus.
The above quotes from Wikipedia, but others can be found with a simple Google search.
As to the In-Body quote, any lens made for Pentax cameras will work, and will have SR. That's a big bonus IMO. Those OLD fully manual lenses from the 60's & 70's work beautifully (I have a few)!
As to the disadvantages in the in-body SR: Not having SR in the viewfinder is irrelevant IMO, what you see through the view finder is not what you ultimately care about, it's the photograph. Besides, if you're hand holding the camera, your eye will be moving just as much as the camera will and SR would be of no benefit.
As far as the AF sensor not moving with the image sensor, while this is unfortunate, it's not really noticed or an issue that I've read about. Thus, irrelevant IMO.
I know this will enrage several Canikon lovers, and I'm NOT suggesting Pentax is better than Canon or Nikon, just simply putting out information that is often overlooked due to the higher advertising budget of Canikon. :mrgreen:
KmH... No sarcasm at all. I love to learn, so please post either links or quotes suggesting the opposite. I'm still a novice, so if the above is incorrect or incomplete, PLEASE educate me and may it be of value to the other members of this board!
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