Search results for 'back focus' - page 982
8-16 Sigma soft?
Hm the K-5 was focusing without a problem both near and far. What you describe was extremely evident on my D40+10-24 I think it has a lot to do with the sophistication of the AF system + UWA. Put the same lens on the D7000 it was focusing perfectly accurately and fast on D40 it could struggle to...
Posted by vrapan on 08/07/2011 - 10:19
Stag party
I havent tried any long telephoto shots myself (I imagine its very challenging and I have the upmost respect for people who get it right) but heres my four penneth anyway! For me the focus is a bit off on #1 it somewhere in the antlers but I cant quite tell, better on the eyeball? #2 is a litt...
Posted by japers45 on 07/07/2011 - 15:03
Stag party
Hi John, Thanks for your comments. I agree that in 1. the focus is not quite right it does seem to be in the antlers somewhere. With 2. perhaps it could do with lightening, the stag was under a tree. No 3, I think what's on his nose is fly! As for 4. and 5. I thought I'd have a change. All ha...
Posted by HowardJ on 07/07/2011 - 15:42
Wide Aperture Lenses
A good example is the Sigma 30mm f1.4. There are probably better options for using at normal apertures, but the lens is extremely popular because it opens up low light shooting and, perhaps more importantly, offers a shallow dof combined with good sharpness in the middle of the image. That sort of ...
Posted by Pentaxophile on 08/07/2011 - 13:40
Wide Aperture Lenses
To be honest, I tend to do this Most of my shooting is around f5.6-f11, going smaller if it would otherwise be too bright or I want motion blur and larger if I need a higher shutter speed to avoid shake. I still like fast lenses, my DA* 50-135mm being a case in point. It's a constant f2.8 and...
Posted by Dangermouse on 08/07/2011 - 15:58
Wide Aperture Lenses
I use fast lenses for two reasons. 1. Creative use of DOF. 2. On the whole the vast majority of lenses only get sharp (or the sweet spot) when stopped down a couple of F-stops. So, the faster the lens, the faster the aperture for that sweet spot. So you could go back to point 1. Fast aperture,...
Posted by Offertonhatter on 08/07/2011 - 18:21
Wide Aperture Lenses
I shoot mostly wide with all my lenses. It's only occasionaly I require a wide DOF. A shallow DOF gives a pic more depth and msot pics I see shot with a large DEOF where everything is in focus look flat to me ( with the exception of a few landscapes ) I would say I shoot at f/1.2 with my A50/...
Posted by Smeggypants on 08/07/2011 - 21:13
Wide Aperture Lenses
Thin DOF (wide-open) is for art. Thick DOF (stopped-down) is for sales. Ahh you mean pictures of products. Yes I can understand that's an area of photography where everything needs to be in focus.
Posted by Smeggypants on 08/07/2011 - 23:44
Wide Aperture Lenses
RioRico is right :wink: from a commercial point of view you will receive complaints about pictures being fuzzy and the sharp ones will just sell :mrgreen: As they used to say the secret of success in photography is f/8 and be there :mrgreen: I regularly used to use a 6x6 Minolta Autocord w...
Posted by Algernon on 09/07/2011 - 10:46
Wide Aperture Lenses
I can't work out who has said they use all their lenses wide open all the time, John! :) Looking at Smeggy's shots for example, I see a lot of shallow DOF in evidence, except for the UWA/Fisheye shots where going for shallow DOF is just not possible (even wide open, although that's only f4) unles...
Posted by Smeggypants on 10/07/2011 - 01:29
Wide Aperture Lenses
I have to admit, reasonably fast primes are the one thing I miss moving over to Pentax. 35mm 1.8, 50 1.8, and 85 1.8 all readily available for very cheap to very reasonable prices. Even stuff like 105mm 1.8 does not cost a fortune. On the other hand to fall below the f2.4 barrier you gotta spend 500...
Posted by vrapan on 10/07/2011 - 22:05
35-80 Pentax Lens
Please get back to the original point of the thread. Now the title says lens we can all hopefully relax and get back on topic? Pointing out a spelling error is one thing, but let's not descend into personal insults.
Posted by johnriley on 10/07/2011 - 08:03
SR or IS
Check this out!.....I'm impressed by the 10x magnification for manual focus,very clever! http://youtu.be/KPdy52mR6Io
Posted by beginner on 10/07/2011 - 16:35
Sigma 10-20 ... Which one?
There is so much DoF with this lens, even wide open, that it does not need much focusing!!:lol: Not if you focus close though so that your magnification is higher :wink:
Posted by Anvh on 12/07/2011 - 21:01
DA* 60-250 AF failure
I have just had to send my 60-250mm off for repair. It wouldn't focus properly, but I'm not sure of the problem, blurry images, it would confirm focus but images blurry. Never did extensive tests :( Just returned from holiday down south and message on answer phone saying awaiting parts to comp...
Posted by alig on 10/07/2011 - 08:22
DA* 60-250 AF failure
Just arrived back from SRS this morning:D:D Test tonight, unfortunately it's easterlies into Heathrow today so no 1830 Singapore Airlines or 1900 Emirates arrivals to train the lens on:( (these are the A380s)..... Two lenses returned from repair in the last week, the FA50 is like new:D Wh...
Posted by Pwynnej on 17/08/2011 - 09:50
Is my 40mm backfocusing
http://flickr.com/gp/74901137@N00/496f50 The focus point was on the R not the D/F... do you think it is backfocusing? Also even if it does not sure I want to use the auto fine tune cause it seems to not have that problem in closer distances. Thanls And yes I know I need to clean my keyboard :)
Posted by vrapan on 10/07/2011 - 17:38
Is my 40mm backfocusing
Well it looks like the focus is off, have you tried it a a longer distance? From the image it does seem a fair way out. I've micro-adjusted my shorter primes 15-90mm and 2 standard zooms, but not my 135, 200 and 300 as the distance involved made it difficult. John
Posted by johnwhit on 10/07/2011 - 19:34
Is my 40mm backfocusing
Now that we have it about focussing, i did some tests and i found that the screw driving lenses i had to use +6 and with the SDM lenses i had to use -6 with the K5 so i'm wondering if that's because of the differnt way the lenses focus. Did someone notice the same error?
Posted by Anvh on 10/07/2011 - 22:04
Is my 40mm backfocusing
Only the DA* and the DA17-70 use SDM and the DA18-135 use DC, for the rest they all use the motor inside the camera body to drive the AF. The lens calibration is a combination between variation in the camera (af module) and in the lens, they both have some tolerance build into them. But since i ...
Posted by Anvh on 10/07/2011 - 23:31
