Pentax 100 SDUF II vs. SMC Pentax M-67 400mm ED
Posted 09 February 2013 - 06:58 PM
Posted 09 February 2013 - 07:48 PM
Posted 09 February 2013 - 11:24 PM
Posted 10 February 2013 - 01:27 AM
I tried using my 80mm apo scope with 35mm camera for daytime photography. Walking around in the 5 acre woodlot near home I managed to sneak up on a nice redtail hawk sitting on a branch. The outfit was already attached to a sturdy wooden tripod, but by the time I got it opened up - and found the hawk in the view finder - out of focus of course - and cranking the 2 speed focuser to get close - never mind fine focus - the hawk was long gone.
It was fine for something where you had lots of time to set up and dial everything in - sort of like using a LF camera. So I gave up on the idea with the scope.
I have the 400 EFif lens - and have shot it hand held on flying Osprey - even with the 1.4x converter turning it into a 560mm lens at f/5.6. Having converters gives more flexibility to the lens. Shooting from a tripod - yes focus is fast and you can pivot around to find a subject and quickly get set to capture it. Having DOF control will give you more options for landscape.
Last item is filters. The lens has a rear filter holder for 67mm filters. There is a top "drawer" that is quickly removed to which you thread the filter. Slide it back in, lock the knob - done. Great if you want to shoot B&W film.
It's a honking big lens - and I love it.
I have found one issue however that has caused some not so sharp astro images - but has nothing to do with the lens. The Pentax 67 - both my astro cameras have this issue. The film door when closed is not fully tight or latched properly due to age and wear and tear on the latches plus gaskets. I found this by squeezing the door and found it could be moved in tighter. Let go and the door would give.
I set up a poster on a wall and levelled and squared the camera with the 200 SMC lens at f/4 as close as the lens would focus. Took some B&W shots with the door in it's looser closed position - and then with a large paper clamp squeezing the door closed tight. The difference was easily seen on the film and when scanned.
No clamp - focus was very good from the middle to the hinge end - but fuzzy towards the latching end with small print very difficult to read.
Clamped shot - sharp from corner to corner with print easily readable. Now I use this paper clamp on both cameras for astro or landscape. Yes - I now have to re-shoot everything - as I know it will be way better. Which is fine by me.
Posted 10 February 2013 - 09:38 AM
Posted 10 February 2013 - 01:30 PM
Posted 10 February 2013 - 11:40 PM
Posted 12 February 2013 - 06:23 AM
Posted 12 February 2013 - 04:51 PM