Search results for 'back focus' - page 2115
Reassembling DA 50-200mm
Erm - hands up all those who have not learned this lesson the hard way. I destroyed a perfectly good Pentax FA 80-320 some years ago trying to cure 'the rattling noise' that I felt may be a screw that had become detached - although no issues in use. Wish I had put up with that rattling noise! ...
Posted by fritzthedog on 26/07/2014 - 12:19
Firmware update
Hi,i've been at a stalemate regarding my photography for the last year or so . So over the last few days i've been getting that feeling back to get out and about again ,so i've been giving my kit the brushdown so to speak and i've been thinking of updating the firmware on my Samsung GX10... at the m...
Posted by melness on 29/07/2014 - 09:42
I-usb7 cable ??
Yes I did try everything that you suggested. I have consider possibly sending the unit back if it isn't the cable. Of course I would not consider this until my warrenty is almost over. Thank you for you quick reply.
Posted by roehrle on 01/08/2014 - 17:29
I-usb7 cable ??
Can I get a firmware up-date wit a defective cable ?? You transfer the downloaded update on to an SD card using a computer and pop the card back in the camera to complete the process. The Ricoh website should give full details. There's no need for the cable. I've never used a cable to transfer imag...
Posted by Aero on 02/08/2014 - 11:45
Focus with K-5/DA*300/TC issues
Trying to determine if lack of sharpness with the DA*300, with and without Pentax 1.4 rear converter, is due to my incompetence or to possible calibration issues. As advised, I have tried to take comparison shots (please see below) and would be grateful for any insight you may have. The shots were ...
Posted by jvs on 07/08/2014 - 21:12
Focus with K-5/DA*300/TC issues
Hi, I don't own that gem of a lens BUT I'd have thought from a quick check of focus tables (I have a free one one on my android device) that at F4 you'd have a very shallow or non existent depth of field range if taken relatively close (say 2 metres). Here's one online to play with http://www.d...
Posted by wvbarnes on 07/08/2014 - 21:30
Focus with K-5/DA*300/TC issues
From these images the lens is back focussing. It is marginal, but that is all the error that is needed to make images look soft with a 420mm focal length, especially at wide apertures. I think you need a positive adjustment on the fine AF Adjustment menu, try '+3' at first, then do the tests again...
Posted by davidstorm on 07/08/2014 - 22:08
Focus with K-5/DA*300/TC issues
Thanks, David. I'll try the adjustments first as soon as I can. I'm well aware that my results are not as sharp as I would like them to be, especially when compared to yours above and lots of others that are posted. The logistics of returning equipment are daunting, but if that what it comes to ...
Posted by jvs on 07/08/2014 - 22:57
Focus with K-5/DA*300/TC issues
Thanks, David. I'll try the adjustments first as soon as I can. I'm well aware that my results are not as sharp as I would like them to be, especially when compared to yours above and lots of others that are posted. The logistics of returning equipment are daunting, but if that what it comes to ......
Posted by davidstorm on 07/08/2014 - 23:17
Focus with K-5/DA*300/TC issues
Hi john. Having had a couple of lenses with back focusing issues I know how frustrating this can be. But if that's all it is, it is easily remedied. I used this http://photographylife.com/how-to-quickly-test-your-dslr-for-autofocus-issues And I found it really easy and straight forward to do. Loo...
Posted by derek897 on 08/08/2014 - 00:14
Focus with K-5/DA*300/TC issues
Just a thought - since you were on a tripod, you did turn SR off didn't you? Won't help with front or back focussing, but might explain the slight lack of sharpness. Apologies if you have this covered... Paul
Posted by PaulEvans on 08/08/2014 - 06:40
Focus with K-5/DA*300/TC issues
Looking at your sample images it's hard to tell as we have no way of knowing what you were actually focusing on. Unless you say for example the third line of writing was the focus point. With the lenses I had, they were focusing closer to the camera instead of actual focus point indicating back fo...
Posted by jvs on 08/08/2014 - 13:20
Focus with K-5/DA*300/TC issues
Hi, it still seems to me that much as John may have an adjustment problem the distance focused on is relevant. At F4 at 10 metres a 300mm lens has a depth of field from 9.91 metres to 10.1 metres ie 190 millimetres. Manageable for bird shots and better still if stopped down to F5.6 where it ...
Posted by wvbarnes on 08/08/2014 - 14:57
Focus with K-5/DA*300/TC issues
Shouldn't your "closer" and "further away" be the other way round? Could be :) The only thing i do remember is it was a + adjustment for back and a - adjustment for front. if its a front or back focus problem it only takes about ten mins to fine tune. Derek
Posted by derek897 on 08/08/2014 - 16:47
Focus with K-5/DA*300/TC issues
Thread I started about it a while back ... makes a big difference.
Posted by Mike-P on 08/08/2014 - 16:54
Focus with K-5/DA*300/TC issues
If anyone's following this.... did the AF fine adjustment with the DA*300mm, ran the same test again and the difference was noticeable. Have n't been able yet to get any birds or dragonflies because of the weather, but got out today in the wind and found a few cows that were reasonably still. How...
Posted by jvs on 11/08/2014 - 22:49
Focus with K-5/DA*300/TC issues
These are indeed noticeably better but it is quite difficult to assess on such large subjects that have a wide range of focus points across them. The acid test will come when focussing on a very small and defined point. However, I still think there may be an equipment issue here. Not sure if it...
Posted by davidstorm on 11/08/2014 - 23:09
Focus with K-5/DA*300/TC issues
Thanks, David. I'll dig out some old ones from before I had the DA*300. I don't recall having problems before, but your eye is better attuned than mine insofar as you know from experience what the lens should be like. I'm just beginning to realize that now.
Posted by jvs on 12/08/2014 - 21:57
Focus with K-5/DA*300/TC issues
Here are a few from awhile back: they seem sharp enough to me to suggest that the camera is not the root of the problem, but more experienced eyes may not agree. They are all raw files converted to jpeg and resized with no sharpening. 1. K-5 + DA 55-300mm 2. K-5 + DA 55-300mm 3. K-5 +...
Posted by jvs on 13/08/2014 - 17:34
Focus with K-5/DA*300/TC issues
If you're looking for sensor or lens element alignment problems then you need a proper test setup, which I'd suggest is camera/lens on a tripod at 90 degrees to a nice frame-filling brick wall then shoot away in both AF and LV modes, wide-open, before posting results on here. Make sure you use a...
Posted by JohnX on 13/08/2014 - 18:41
