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Forum: Pentax SLR Lens Discussion 09-30-2015, 07:03 AM  
Sigma 17-70 HSM on K-5IIs
Posted By bobpur
Replies: 6
Views: 1,107
Some sigmas use a small rubber drive belt for the af the 105 macro repair is online, do a search fot it.
Apparently not a difficult repair.
Forum: Pentax SLR Lens Discussion 07-29-2015, 09:14 AM  
What lens was used for this ?
Posted By bobpur
Replies: 20
Views: 1,768
The tele adapter is called " ESCOT SER VI " Think it is a 1.5 but nothing marked on it to say. One of those
junk box finds, usually I remove the glass and use them as lens hoods.
Glad I kept this one alive.
Forum: Pentax SLR Lens Discussion 07-29-2015, 08:43 AM  
What lens was used for this ?
Posted By bobpur
Replies: 20
Views: 1,768
Found at a flea market for $5., like new including the leather case. Nice on it's own and very sharp from 4.5 but when I added
an old Aux tele lens on the front that is what happens to the background. Only with
this particular lens, tried with a lot of others but no luck.
Forum: Pentax SLR Lens Discussion 07-28-2015, 05:42 PM  
What lens was used for this ?
Posted By bobpur
Replies: 20
Views: 1,768
Hints, It's old , German and 135mm
Forum: Pentax SLR Lens Discussion 06-23-2015, 12:45 PM  
50-200mm WR DA vs DA-L pros and cons
Posted By bobpur
Replies: 13
Views: 1,165
Regardless of the material, they are both screwed into plastic mounts on the lens. Unless you really
do a lot of lens changes it will take a long time to wear out the plastic mount.
Forum: Pentax K-3 06-11-2015, 08:43 AM  
K5 II/s pictures seem sharper than K3
Posted By bobpur
Replies: 22
Views: 4,458
My old K200 is just as sharp, the only difference is the size. The sensor has no bearing on the pic quality, the lens is the
qualifier providing the focus is the same.
Forum: Pentax DSLR Discussion 04-12-2015, 04:21 AM  
Looking at getting a Pentax Kx
Posted By bobpur
Replies: 21
Views: 2,803
KX , one of the best Sony sensors, 12mp more than enough and the metering with old lenses is excellent.
Anything more is just icing on the cake.
Forum: Pentax SLR Lens Discussion 04-11-2015, 07:56 AM  
use of old lenses - returning to full dslr
Posted By bobpur
Replies: 6
Views: 1,140
You don't have to change any settings, it is fine to leave the "use aperture ring" setting on.
Forum: Photographic Industry and Professionals 03-31-2015, 11:33 AM  
Hoya's Medical Unit Under Federal Investigation
Posted By bobpur
Replies: 27
Views: 3,210
Best not to leave your Q on a chair then sit on it ! :(
Forum: General Photography 03-26-2015, 05:48 AM  
Sunny 16 rule hit the APS-C limit
Posted By bobpur
Replies: 33
Views: 4,809
Depends on the light there is no set rule for noise vs iso, in bright sun 4000 is very clean but
in low light can be noisy.
The old rules no longer apply the same way with digital, even F stops should be eliminated and replaced with another
more appropriate measure such as field depth as used in video.
Eg. a linear aperture lens with an EVF showing real time is using the sensors capability without crippling it by setting
artificial Stops.
The limits are not defined by the sensor size but by the decision of the photographer.
PS Best to not read too many reviews or data this is Art not tech...
Forum: Pentax Film SLR Discussion 03-05-2015, 08:41 AM  
e-bay add
Posted By bobpur
Replies: 2
Views: 1,165
Are you sure it did not say EX-Husband !!!
Forum: Pentax Medium Format 03-03-2015, 08:14 AM  
Lost in Translation
Posted By bobpur
Replies: 5
Views: 1,314
Could have been Hemeroid !
Forum: Pentax Q 02-17-2015, 09:30 AM  
Anyone making hotshoe to Weaver scope adapters?
Posted By bobpur
Replies: 11
Views: 2,220
Have a look at this,You may not need it.

EE-1 Dot Sight - New | Olympus
Forum: Pentax K-30 & K-50 02-11-2015, 08:24 AM  
Old lenses can break new bodies?
Posted By bobpur
Replies: 25
Views: 4,644
I have stopped using the Adaptalls adapter on my cameras because of that especially the PK/A ones, had one jam completly the cam motor
and had to take it apart to remove it from the camera.
Some design problem with the Pentax adapter as the nikon ones are very smooth and much easier to move the lever the original ones feel
quite rough.
Have one Ebay knockoff that I use as it does not have any aperture lever so Stop down is a must.
Forum: Pentax DSLR Discussion 02-10-2015, 01:19 PM  
Have a K-01. Considering picking up a gh2. Good idea?
Posted By bobpur
Replies: 9
Views: 1,531
I have a G3, very good for video and the focus aids make it easy to use any manual lens, use with a sigma 120-400.
No complaints of build quality here, all aluminum and swivel screen, EVF is very useable as well. Always
keep the body with a Sigma 19mm in the bag, if something interesting shows up I just put it on the big lens for video.
Get the adapter with aperture control ring on it.
Forum: Pentax SLR Lens Discussion 02-08-2015, 07:23 PM  
help me understand...
Posted By bobpur
Replies: 15
Views: 1,692
So instead of a 1.5 crop it would be just a 1, then the larger sensor would actually be smaller unless
of course the pixels would increase by .5 then everything would be the same.........UNTIL a 1.4 multiplier was
installed between the lens .
That would negate the previous multiplier ?????.......
I think I will keep using my Q ;( and save the money for therapy.
Forum: Pentax SLR Lens Discussion 02-05-2015, 10:52 AM  
FF used lenses to start with
Posted By bobpur
Replies: 97
Views: 8,824
My Tamron SP 24-135 will do nicely
Forum: Pentax K-5 01-26-2015, 06:20 PM  
K-5 IIs inconsistent exposure
Posted By bobpur
Replies: 26
Views: 4,170
Same here, just seems that is how they are. Leave mine at -7 ev.
What I did find after many hours of tedious testing is the metering area is quite small not a lot more
Than center weighted. Try using live view and panning around check the exposure readings and screen. So
If you change the position to fall on to a dark or light item it puts it off.
I also found on Nikon forums the D7000 has the same sensor and same exposure problem, could be related.
Never got any help here except the User Error Excuse but having other cameras that do not have this problem
It seems to be a limitation of the hardware or programming.
Forum: Pentax SLR Lens Discussion 01-20-2015, 09:17 AM  
35mm 3.5 smc takumar issue
Posted By bobpur
Replies: 6
Views: 1,111
Some of the old lenses are quite difficult to open because the threads are locked with a lacquer, lacquer thinner
around where the threads are usually does it. Just a VERY small amount using a thin paint brush spreads around
the lens. Wait a few seconds and try it.
Forum: Pentax SLR Lens Discussion 01-19-2015, 11:14 AM  
35mm 3.5 smc takumar issue
Posted By bobpur
Replies: 6
Views: 1,111
When you replaced the lens ass from the front did you line up the aperture control link into the long brass arm with the slot ?
If you did it is not right, it fits into a small slotted arm near the bottom of the lens body.
Forum: Pentax DSLR Discussion 01-17-2015, 08:26 AM  
Of Interest to Linux Users - PEF vs DNG
Posted By bobpur
Replies: 34
Views: 4,623
Get Darktable 1.6, will do all you need and more and no Monthly payments !

Using Suse 13.1 now, have used linux for many years it's a shame that through bad PR by unnamed large
Corporations has affected its user base.
Very mature now and can meet and beat the others.
Forum: Troubleshooting and Beginner Help 01-15-2015, 06:21 PM  
Raw function disabled/greyed out
Posted By bobpur
Replies: 4
Views: 1,109
You have another option turned on, scene mode ect.or green setting on the dial.
Forum: Photographic Technique 01-09-2015, 08:31 AM  
Macro 100mm macro question
Posted By bobpur
Replies: 16
Views: 1,777
Sigma 90mm, " A " Mount as good as my Tamron and smaller. Only does 1/2 but I find it enough and can add the extra
lens for more.
Sigma 90mm F2.8 Macro Lens Reviews - Sigma Lenses - Pentax Lens Review Database
If you can find one ( I have one for Nikon ) Vivitar 135mm close focus
Vivitar Auto Close Focusing (1:2) 135mm f/2.8 Lens Reviews - Vivitar Lenses - Pentax Lens Review Database
Forum: Pentax K-5 01-07-2015, 06:34 PM  
K5 Petzval project
Posted By bobpur
Replies: 13
Views: 2,676
Get an Original instead, Carl Zeiss Biotar 75mm f1.5 . same bokeh if you want it and much better resale value.
Also better build quality.
Had one sold it...
Forum: Pentax SLR Lens Discussion 01-02-2015, 09:54 AM  
Crop Factor Thoroughly Explained
Posted By bobpur
Replies: 30
Views: 2,625
There is a much simpler method that works with any camera, You usually get what you see in the viewfinder !
I use lenses by purpose and don't think about the numbers anymore.
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