Search results for 'back focus' - page 720
CHINON PENTAX PK fit 200mm f3.5
I don't know anything about is lens, but if you are after a cheap 200mm and don't mind grappling with manual focus and exposure, try the SMC Pentax-M 1:4 200mm. It's not a bad performer, and can be had on Ebay for not too much money. G
Posted by George Lazarette on 09/08/2008 - 12:28
CHINON PENTAX PK fit 200mm f3.5
Manual focus's not a prob ,actually prefer it for wildlife .Thanks for your input .8)
Posted by melness on 09/08/2008 - 13:01
Which 50mm Lens?
Personally, I'd forget the M series lenses if you have a Pentax DSLR other than the *istD or *istDS. For lenses that should last you a lifetime, barring accident or other misfortune, stick to the SMCP-A series for manual focus, SMCP-F or FA for auto focus. An SMCP-A 50mm 1:1.7 would be a good ...
Posted by Mannesty on 12/08/2008 - 10:20
Adaptall 2 PKA mount instructions?
SORTED !!!! After you pinted out the wear I had a closer look and then at the mount. Went to Ebay and managed to find someone selling a PKA mount (expensive little buggers arent they) who had photographed both sides in a decent size. From there I could see the actuator on mine was at a differen...
Posted by Mike-P on 13/08/2008 - 12:31
Chinon auto?
Would a Pentax K auto Chinon be the same as a pentax A i.e manual focus but auto exposure on my GX20? Sorry if it's a silly question but i am new to pentax/samsung camera's. Roy
Posted by royd63uk on 12/08/2008 - 19:59
Sigma 1.4x teleconverter
I have just purchased one of these,(haven't recieved it yet) I plan to use it with my Bigma and 180mm macro and would like know if its compatible with my pentax SDM lenses. Even if I only have manual focus that will be ok, but i don't want to damage anything either. Has anyone used one of these T...
Posted by Clarky on 14/08/2008 - 13:34
Sigma 1.4x teleconverter
You can use the Sigma 1.4x on many lenses. However, it has a protruding element and you have to be very careful to check that the lens you want to use it with has a recessed rear element. The Bigma doesn't, which is the main reason that that lens has a limiter switch. If you want to use the TC with ...
Posted by chirpy on 14/08/2008 - 15:29
Sigma 1.4x teleconverter
I have just purchased one of these,(haven't recieved it yet) I plan to use it with my Bigma and 180mm macro and would like know if its compatible with my pentax SDM lenses. Even if I only have manual focus that will be ok, but i don't want to damage anything either. Has anyone used one of these T...
Posted by beachboy2 on 14/08/2008 - 16:21
Another bad Sigma 10-20
Spent the morning wandering around Chester taking shots to test out the new Sigma 10-20 I've just received from SRS. This is the 2nd copy I've had after initially buying from somewhere else... unfortunately no luck with this one either, slightly soft on the R/H side (not as bad as my 1st copy) b...
Posted by simonkit on 15/08/2008 - 11:51
Another bad Sigma 10-20
The centre is best at F5.6, and the borders at F8, and you should test with manual focus to exclude camera AF issues. www.photozone.de/pentax/146-sigma-af-10-20mm-f4-56-ex-dc-pentax-k-review--test-report?start=1
Posted by iceblinker on 15/08/2008 - 12:34
Another bad Sigma 10-20
A week back I came across a used Sigma 12-24mm in the Chester branch of the London Camera Exchange. I seriously considered buying this before getting the 10-20 instead. It's up for a sale at £300, might be worth checking out. Benefits over 10-20: 1. Very low barrel distortion. 2. Can be used on...
Posted by tobyed on 15/08/2008 - 12:34
Another bad Sigma 10-20
Can you post some of the results with the lens please. To be honest the images are that bad I've deleted them...lens is boxed-up & on its way back to SRS very soon... this is the 2nd copy & although the 1st had a very soft R/H side the rest of the frame was sharp & in focus - this copy isn't in ...
Posted by simonkit on 15/08/2008 - 12:51
Another bad Sigma 10-20
I'm just about to order one of these from SRS. How do I ensure I don't get the one you're sending back?! :wink: More seriously, I'm a bit concerned by how many people are having problems with this particular lens. I'm hoping it's some kind of self selecting sample and that they've sold so many...
Posted by Tooks on 15/08/2008 - 13:07
Lens converter 2x
Because the closest focusing point does not change. A 100mm lens focusing to the minimum distance of a 50mm has approximately 1:2 magnification, which is the same as many macro lenses of the manual focus era at least.
Posted by johnriley on 16/08/2008 - 17:49
Lens converter 2x
Surely if that were the case there would be no need for 2X macro converters, everyone would use a normal teleconverter. And Macro teleconverters would have no need for the macro side, they would just be a basic teleconverter. Wouldn't they ? With my 2x macro teleconverter I turn it one way fo...
Posted by Mike-P on 16/08/2008 - 18:50
Lens converter 2x
2x Macro Converters have additional focusing ability built into the TC. I'm not sure if this means that they could focus to 1:1 as a result, but I have a feeling that might have been the reason for their existence. Proper macro lenses used to focus to 1:2 only, modern ones tend to focus all the w...
Posted by johnriley on 16/08/2008 - 21:24
Lens converter 2x
Ah, missed the 1:2 focus bit. So you are saying that if I put my 2x teleconverter on my Pentax A-50mm or F-50mm 1.7 it should give the same focus ability as my M series 50mm f4 1:2 macro lens? Edit : On second thoughts that would that be the same as a 100mm f4 1:2 macro lens
Posted by Mike-P on 16/08/2008 - 22:30
DA*16-50 vs DA17-70
Hi all, I'm in limbo!:| I've only ever had the kit lenses in the past, and as I have saved/earned/scraped together funds to upgrade I was just wondering what to do, esp in light of probs with the DA*. Is the Da*16-50 worth the extra over the DA17-70? Is there anyone who has had the chance to...
Posted by alig on 15/08/2008 - 21:31
DA*16-50 vs DA17-70
Well, I suspect that your chance of getting a bad 16-50 is actually rather low, and if it is bad, your supplier will change it. G I've had two DA*16-50mm lenses, both with focussing issues, failing to focus lock on an evenly lit contrasty landscape scene. The 2nd one is on it's way back to SRS...
Posted by Mannesty on 16/08/2008 - 11:09
DA*16-50 vs DA17-70
The K10D's AF sensors need very strong contrast which is why it isn't very good in low light or flatter scenes. Hmm. I think this is overstating the issues with Pentax AF. I've had two DA*16-50mm lenses, both with focussing issues, failing to focus lock on an evenly lit contrasty landscape scene...
Posted by ChrisA on 16/08/2008 - 14:04
