Tuning a lens
Posted 17/05/2010 - 21:46
Link
Thanks, 50m is very far for any lens, so one can not expect great detail at that distance.
Greg
Greg
Posted 23/05/2010 - 20:03
Link
Hi,
Ran some tests today and it's amazing how a lens improves when the photographer applies his mind.
I first rechecked the Back/front focus and reset it. I then took a whole series of photos (2 sec mirror lock up) of a test chart at various focal lengths and at each f stop and the results between f8 to f16 are OK at all focal lengths. I then went and took some random pictures freehand using SR.
I've posted a few to flicker.link
Here are two examples

and

The examples on Flicker are much sharper than here, thanks for all the advice.
Greg
Sorry I forgot to mention that they have all been processed from RAW, clarified 60 and slightly sharpened in Elements 6.
Ran some tests today and it's amazing how a lens improves when the photographer applies his mind.
I first rechecked the Back/front focus and reset it. I then took a whole series of photos (2 sec mirror lock up) of a test chart at various focal lengths and at each f stop and the results between f8 to f16 are OK at all focal lengths. I then went and took some random pictures freehand using SR.
I've posted a few to flicker.link
Here are two examples

and

The examples on Flicker are much sharper than here, thanks for all the advice.
Greg
Sorry I forgot to mention that they have all been processed from RAW, clarified 60 and slightly sharpened in Elements 6.
Add Comment
To leave a comment - Log in to Pentax User or create a new account.


371 posts
19 years
Bath,
UK
Distance - quite a bit - the vehicle was stopped short of the middle of the bridge over the water, so it must be close to 50 yds.
Image is as shot, in *** jpeg, with no PP.
It's not a lens I use a lot. My SA travelling kit was, IRRC, K10D, ist D, MZ-S, FA28-105, FA80-320, DA18-50 MkI, DA50-200. I shot the Kruger section of our trip with the FA80-320 on the K10 & DA50-200 on the ist D. It was what I had available at the time - and could get in my pack as hand luggage.
Am I happy with it - yes. I've got a 100-300 which sits in my office draw. That's definately softer at 300mm. I didn't use the lens at its longer end that much - the Heron was one of the few instances I could remember without going through each image. For game drives, based on my experiences in Kenya, Zimbabwe and SA, I reckon that the focal range of the DA50-200 is pretty close to optimum.
Steve
Half Backs: K10+BG,DA16-45, DA50-200
Backs: LXs,Super As and lots of A, M & K lenses
Impact Subs: 28mm Shift, K 135-600 (the Banahan of Pentax zooms ), 400-600 Reflex