Search results for 'back focus' - page 821
Pentax 50-200mm DA ED f4-5.6 Lens
The DA18-250 is not an light lens so it would weight down after some time, certainly if you add the weight of the camera. The DA40 and DFA100 combination I found lighter since you can distribute the weight. Also how many of the shots would be on the wider the 55mm? for animals and such a DA55-300...
Posted by Anvh on 30/10/2009 - 16:38
Pentax M 50mm f1.7
They are actually film inserts, not backs. The camera will only operate with a film inserted, or by using a special blank back that is for the purpose.
Posted by johnriley on 30/10/2009 - 20:48
Pentax M 50mm f1.7
Here we go this is what I've found in the box so far, and it's hugh.... 645N body and the 645 lenses are as follows these are the details straight of the lenses so, Pentax A 645 1:3.5 150mm Pentax P FA 645 macro 1:4 120mm Pentax A 645 1:2.8 55mm Also a Pentax K for 645 lens adaptor. getting ba...
Posted by Transit on 01/11/2009 - 23:06
Focus adjustment on K20D/K-7
Just wondering about non Pentax here. For instance I have 4 Sigma lenses so I would adjust the 70-200mm f2.8 if needed and the camera would save the settings ... if I then had a problem with the 100-300mm f4 would it recognise a different lens (like it does Pentax) or will this cause problems?
Posted by Mike-P on 30/10/2009 - 18:24
Focus adjustment on K20D/K-7
It might cause a problem if it recognised a Sigma 100-300 as say a Pentax 300 and you then mounted a Pentax 300. It would think they were the same lens.
Posted by bforbes on 30/10/2009 - 18:32
Focus adjustment on K20D/K-7
I don't think I worded my question very well to be honest. If you have 2 Sigma lenses needing focus adjustment do you have to change the settings every time you mount them or does it recognise them as different lenses like it does the Pentax.
Posted by Mike-P on 30/10/2009 - 18:37
Focus adjustment on K20D/K-7
The Sigma lenses tend to incorrectly identify themselves, I used to have a 28-200 which thought it was a Pentax FA28-105. I would expect that all will be well as long as your two sigmas think they are different lenses, and don't identify themselves as any Pentax lens you actually have.
Posted by Mongoose on 30/10/2009 - 18:40
Focus adjustment on K20D/K-7
Try taking test images with each lens. Then check what Photome reports the lens as. If it comes up with a different description for each, you should be ok
Posted by bforbes on 30/10/2009 - 18:42
Focus adjustment on K20D/K-7
I agree, if they identify differently you should be OK.
Posted by Greytop on 30/10/2009 - 19:55
Focus adjustment on K20D/K-7
Find out by setting a different AF Adjustment value for each lens, then refitting each lens and checking the settings.
Posted by iceblinker on 30/10/2009 - 21:47
Focus adjustment on K20D/K-7
Find out by setting a different AF Adjustment value for each lens, then refitting each lens and checking the settings. If I had a K20D or K-7 then I would .. as I don't then it's a bit difficult .. hence why I was asking the question :wink:
Posted by Mike-P on 30/10/2009 - 22:13
Focus adjustment on K20D/K-7
If I had a K20D or K-7 then I would .. as I don't then it's a bit difficult .. hence why I was asking the question :wink: I think it will remember the individual settings for your Sigma lenses each time you mount the same lens. Where I can see a problem is in, for example, the case of my Sigma 1...
Posted by bforbes on 30/10/2009 - 23:01
Focus adjustment on K20D/K-7
If it's reading the lens wrongly then the SR system won't be optimal either. This sort of thing is one of the reasons for my "Pentax only" argument.
Posted by johnriley on 30/10/2009 - 23:34
Focus adjustment on K20D/K-7
Find out by setting a different AF Adjustment value for each lens, then refitting each lens and checking the settings. If I had a K20D or K-7 then I would .. as I don't then it's a bit difficult .. hence why I was asking the question :wink: It depends on the exact lenses. I think the question can on...
Posted by iceblinker on 31/10/2009 - 05:06
Focus adjustment on K20D/K-7
When I tried adjusting my camera for my Sigma 180mm and 135-400 APO lenses, the camera used the same settings for both. When I PP images from these lenses, they are identified by Lightroom as simply 'Sigma' with no additional info.
Posted by Mannesty on 31/10/2009 - 07:28
Focus adjustment on K20D/K-7
When I tried adjusting my camera for my Sigma 180mm and 135-400 APO lenses, the camera used the same settings for both. When I PP images from these lenses, they are identified by Lightroom as simply 'Sigma' with no additional info. Thanks Peter, that's just the info I wanted. If it's reading the ...
Posted by Mike-P on 31/10/2009 - 15:45
Cheap long lenses?
I have the sigma 70-300 but I find it's not too briliant at the longer end, especially when the light is less than ideal. I was thinking more of some of the older pentax or other manufacturers prime lenses. Maybe the Takumars or eastern european offerings. Manual focus is ok and I have an m42 ada...
Posted by doingthebobs on 01/11/2009 - 21:27
Cheap long lenses?
Is there ANY lens longer than 300mm that doesn't cost a lot? I don't remember seeing one. If you insert the word "good" after the word "ANY", the answer is no. That said, keep your eyes peeled for a manual focus Pentax 400m, either A or M. I have an M and almost always use it wide-open in order ...
Posted by George Lazarette on 06/11/2009 - 18:30
Cheap long lenses?
I've got an old Tamron 200/500 F6.9 if you are interested,manual focus and weighs a ton.......a monster of a lens...Ken
Posted by beginner on 06/11/2009 - 20:11
stiff lens
I was planning to use my SMC-A 50mm f1.4 today. I found, however, that the focusing has gone extremely stiff. The aperture ring is fine, and blades shut down etc. OK but the focus is almost jammed. Any idea what may have caused it and if it is fixable? Not having much luck with lenses at the m...
Posted by womble on 04/11/2009 - 18:20
