Search results for 'back focus' - page 2007
DOF
Assuming DOFMaster's numbers quoted by Anvh are right, the DOF for 70mm at f/2.8 and 8 feet is +/- 2.4 inches approximately. You guestimated the sign to be 4 inches from the wall and so it would be a little out of focus. Interestingly, the figures for the 70mm at f/2.8 are the same for 50mm at f...
Posted by womble on 24/02/2009 - 22:37
New K20D - DA* Zooms - Slow Focus ???
OK - after buying a K20D to replace my K10D (which had a broken LCD screen) I've had a funny thing happenning... My DA* zoom (either one) seems to, when you first turn the camera on, move so slowly as to seem like it's not actually focusing. The first time this happenned, I switched to manual fo...
Posted by Classvino on 25/02/2009 - 03:01
New K20D - DA* Zooms - Slow Focus ???
Brrr, you don't think minus 15 is cold? That could be the problem - nothing else in particular springs to mind.
Posted by johnriley on 25/02/2009 - 08:50
New K20D - DA* Zooms - Slow Focus ???
Admittedly, it's cold here (it's February in Canada after all) Jamie It's Febuary here in Spain as well :D Seriously, I would think -15 would certainly cause a problem or two. Saying that, if it didn't happen with your K10D then maybe the cold is not such a problem.
Posted by Mike-P on 25/02/2009 - 09:15
New K20D - DA* Zooms - Slow Focus ???
I did think my DA17-70 (which is SDM) focused more slowly in the cold snap we had - but that wasn't -15! Haven't managed to see it doing the same thing again. Matt
Posted by MattMatic on 25/02/2009 - 12:04
New K20D - DA* Zooms - Slow Focus ???
Might it have something to do with the battery power. extreme cold does affect batteries so the cold may be restricting the battery output, -15 :shock: I didn't know it could get that cold. How do you live in that. note to self: don't take brass monkey's with you if ever traveling in Canada:...
Posted by Clarky on 25/02/2009 - 21:09
New K20D - DA* Zooms - Slow Focus ???
I have a K10D with an 18-250 lens. I recently used it at dawn in Scotland when the temperature was -10c. All worked OK but I had a fully charged battery and when not using the camera put the battery in my trouser pocket to keep it warm. A non Pentax battery I use as a spare really struggled in the c...
Posted by Kenty on 25/02/2009 - 22:26
New K20D - DA* Zooms - Slow Focus ???
Have had this problem with my 50-135, and it was not in the cold, it also squeaks a bit occassionaly! We had the 16-50 out in Chicago on Friday morning at -13c with no problems. Not sure if this helps, but do know that it is not only the cold that can cause the problem!
Posted by Unlocker on 26/02/2009 - 04:53
New K20D - DA* Zooms - Slow Focus ???
Have had this problem with my 50-135, and it was not in the cold, it also squeaks a bit occasionally! We had the 16-50 out in Chicago on Friday morning at -13c with no problems. Not sure if this helps, but do know that it is not only the cold that can cause the problem! I'm inclined to think i...
Posted by Classvino on 27/02/2009 - 01:31
New K20D - DA* Zooms - Slow Focus ???
My DA 50-135 is bullet proof, Literally, Shot with paintballs and its fallen from a top bunk, and still going strong. I haven't experienced any of those symptoms you describe. :?
Posted by Clarky on 27/02/2009 - 04:34
Connecting camera to Telescope
Yep, you are on the right tracks, sort of. The T ring adapter fits to your camera. The eyepiece tube screws into that and slots into the eyepiece holder on the scope and you can put different eyepieces into it, if required. YOu can also use it without eyepieces so the scope basically becomes your l...
Posted by Father Ted on 25/02/2009 - 13:10
Filter, or not?
I told you we wouldn't agree :D I use a lens hood when taking the photo, but I don't leave it on when I stuff the lens back in my bag. And if anyone wants to come and visit my excavation in Romania next summer and wave their precious lenses around my site, feel free. If you change your lens thoug...
Posted by womble on 01/03/2009 - 00:39
Filter, or not?
Consequently, I now have become a firm member of the pro-filter group. I agree. Everyone should use a filter from the moment they buy the lens to the moment they sell it to me on eBay. I will then remove the filter before I start to use the nice clean lens I have just bought..... The filter wi...
Posted by johnriley on 25/03/2009 - 09:23
Sigma Lens Problem
Hi, Very new to all this but am hoping for some help. I've just bought a Sigma 150-500mm f4-5.6 APO DG lens fitted to my camera (K10D) and the auto focus doesn't work. I've read all the info I can on this and from what I can gather it should. Is the lens defective or doesn't my camera support ...
Posted by DazBest on 03/03/2009 - 22:56
Raw files
Sorry for the long comment but I thought this instructions would be helpful while installing this plug in in your photoshop 7.:P Photoshop Elements: Windows®: NOTE: You must follow all of the new instructions in order to successfully install the Camera Raw Plug-in for Photoshop Elements. 1....
Posted by user_removed on 04/03/2009 - 22:39
T Ring availability for Pentax Cameras
I got mine from here http://www.telescopesplus.co.uk/viewsubcategories.php/Accessories/T-Rings_for_35mm_SLR_Cameras/15 they don't have any Pentax ones right now, but they'll be back in stock soon enough
Posted by Mongoose on 19/03/2009 - 22:27
Remote Control
This one will do what you want. I've got the same one. I don't have any trouble with my fingers, but because only one button is used for Pentax cameras (top right hand button) and it's made of soft rubber and projects 1.6mm you can push it down with anything, even put it upside down on a table and...
Posted by shim on 07/03/2009 - 16:50
Remote Control
Sure this is a stupid question but can you AF with the remotes you are advising by half clicking, hope you understand what I mean. I wish to take birds through double-glazing so I do need to focus first.
Posted by Thordell on 09/03/2009 - 08:27
Remote Control
Sure this is a stupid question but can you AF with the remotes you are advising by half clicking, hope you understand what I mean. I wish to take birds through double-glazing so I do need to focus first. Jackie Yes you can AF with the remote. I am not sure if they all differ from each other b...
Posted by aminstar on 09/03/2009 - 09:12
Remote Control
Hi Amin, thanks for your response, are you speaking of any particular unit or do they all work much the same? I find with the Pentax one that by the time I have managed to focus and then fire on continuous and then managed to turn the thing off I have 100 shots of an empty twig. That is why I am ...
Posted by Thordell on 09/03/2009 - 10:13
