Search results for 'back focus' - page 1010
Infinity focus on 18-135
I suspect that the more expensive AF lenses have an "exact" infinity stop while the cheaper models don't. I know I cleaned some fungus from the front of an old F 80-200mm a while ago which had a lot of play between the marked infinity and the actual end stop. Made it interesting trying to set in...
Posted by Dangermouse on 28/10/2011 - 14:37
Infinity focus on 18-135
It's quite often found in telephoto lenses that there is movement beyond infinity. The reason is that expansion of the lens body and glass can cause shifts in the position of infinity. The more bulk in the lens the more the point will shift.
Posted by johnriley on 28/10/2011 - 15:02
Infinity focus on 18-135
If you want to take a picture of a featureless blue sky it won't matter whether you're in focus or not. It will look the same out of focus as it will in focus. :roll:
Posted by MarkTaylor on 28/10/2011 - 18:02
Lenses to keep, lenses to let go
Keep the DA55-300. Consider it the Littlema replacement for the Bigma when travelling light. Agreed - it fulfills an entirely different role when travelling "light", and is much smaller but still pretty sharp). Oh my gawd... I now know why it's called the Bigma. Just got back from SRS with it (gr...
Posted by ChrisA on 28/10/2011 - 19:14
16-50 DA finally dead
Well after a disappointing week away in tuscany with my hand on manual focus 95% of the time, I finally have decided, after 2 years of problem after problem with the auto focus, to send this unfaithful and very expensive lens to fowa pentax in Torino Italy for repairs. I was patient but very stupid ...
Posted by mattox on 27/10/2011 - 16:30
Lens Journey
I'm coming up to 3 years now in the Pentax fold and its only now that I feel that I can really understand my focal length needs. I've had a K20D (which I adored) and a K-5 which i'm still getting to grips with (almost a year on :))but its the lenses that are the key still. It was last week at a gig ...
Posted by robbiec on 29/10/2011 - 00:03
Pentax A* 300mm and Lens Repairs
well the did a good job of servicing my old *istD and replacing the focusing screen. Seems they'll touch *cameras:D I should probably elaborate. They're based in the back room of a model shop, and the only place that comes close in the untidiness stakes is my own office. It's a complete mess....
Posted by ChrisA on 23/01/2012 - 21:30
Finally bought a Auto focus 50mm 1.4
Hi everyone, I finally bought a Sigma 50mm F1.4 HSM lens off ebay for £260. I was really having a hard time choose between this sigma or the DA*55mm for the past 6 months. The DA* is far too overpriced and I just find it very hard to spend such money for it. The sigma isn;t cheap either, marketin...
Posted by m42geo on 29/10/2011 - 17:54
Finally bought a Auto focus 50mm 1.4
I've struggled to get beyond the FA 50/1.7 as it isn't a focal length I use much on digital. Let us know how you get on with your new arrival.
Posted by smc on 29/10/2011 - 21:25
Finally bought a Auto focus 50mm 1.4
I´ve read the Sigma is very good, very sharp even wide open. Check it for focus accuracy first, though.
Posted by Jonathan-Mac on 29/10/2011 - 21:29
18-250mm lenses
Hi Vic, It is difficult to decide based upon other peoples opinions, my suggestion would be to buy one and try it, the Tamron or Pentax. If you decide it isn't for you you should be able to sell it and get your money back. The reason I say this is that I read many glowing reviews on the Tamro...
Posted by simonkit on 30/10/2011 - 16:32
18-250mm lenses
ChrisA. I just 'phoned Microglobe and they apologised and said they would remove them both from their site ASAP as they don't have them anymore. AH WELL! back to the search. Malvern_man. As I said to Eagle2 I have Sigma lenses already so I might stick with them, but I'm still looking. CHEERS V...
Posted by vic cross on 01/11/2011 - 09:25
Is there room for two?
Current line up... 8-16 Sigma 18-55 kit 28 2.8AL 55 1.4 90 Tamron macro 135 2.5 Ashai Pentax All on a K5 I still haven't scratched the longer lens itch. I want something for indoor school assembly shots, and thought the 135 would be okay, but focus is hard with my eyesight in low light. Al...
Posted by trickletreat on 31/10/2011 - 09:45
Is there room for two?
Well, from what you're saying there, it comes down to length doesn't it? If the 135mm reach is enough for you in lower light (and obviously you have the prime so probably have some idea) then get the pentax 50-135. If you think you need to go out to 200mm get the Tamron. They're both very well re...
Posted by timothyw on 31/10/2011 - 10:00
SMC Pentax-A 50mm f2
Yep, absolutely. The f2 version of the 50mm is under-rated IMO, you do need to stop down a bit to get the best results but this goes for all lenses. If you ever decide it doesn't meet your needs then you should be able to sell for about the same as you paid for it. Make sure you set the lens...
Posted by Dangermouse on 31/10/2011 - 15:56
SMC Pentax-A 50mm f2
F/1.2 would be better of course but f/2.0 is ok 8) The difference between f2.0 on your new fifty and the zoom lens is significant and will give you a much shorter DoF to play with. You might have a hard time getting your kids in focus if they are of the kind that moves around a lot and fast.
Posted by Joe S on 31/10/2011 - 15:58
SMC Pentax-A 50mm f2
Yep, absolutely. The f2 version of the 50mm is under-rated IMO, you do need to stop down a bit to get the best results but this goes for all lenses. If you ever decide it doesn't meet your needs then you should be able to sell for about the same as you paid for it. Make sure you set the lens...
Posted by Whizzkiddwill on 31/10/2011 - 20:52
How good is this Sigma?
Is it internal focus or external focus? The FL of internal focus lenses varies/reduces as you focus closer. An internal focus 180mm is not really much different than a 100mm external focus lens for macros. AF isn't generally used for macro work anyway. 1:1 probably refers to the 35mm fra...
Posted by Algernon on 01/11/2011 - 10:38
cashback
I agree Dave - it would be nice if they gave those who already have a Pentax camera, and are happy with it, a treat and offered us the lenses with money back for a change.
Posted by Gwyn on 01/11/2011 - 10:32
Pentax 50-200 or 55-300?
and autofocus is pedestrian This is mostly due to the unusually long focus throw IME. If you get it close with quick shift, I find it pretty quick on the K10D. and hunts too much (could be tricky on safari). Do you mean generally, or just if you let the subject get out of the centre spot? ...
Posted by ChrisA on 04/11/2011 - 17:34
