Search results for 'sensor cleaning' - page 113
Takumar catastrophe averted
Actually a good save there! I am glad you are able to get superior results from such a situation. Great cleaning job. The Photomonk
Posted by Photomonk on 09/01/2010 - 18:18
Takumar catastrophe averted
Actually a good save there! I am glad you are able to get superior results from such a situation. Great cleaning job. The Photomonk cheers! yes I thought the end was nigh
Posted by Transit on 09/01/2010 - 19:28
Pentax DA 18-250mm vignetting
Just checked the lens and could find no condensation. Took a test shot just now and no discernable vignetting of any kind at f10 and 18mm. I used the lens a few days ago in the same cold conditions and didnt get this effect, so somewhat perplexed. checked and cleaned the lens this moring befor...
Posted by petemasty on 14/01/2010 - 23:24
Testing a Tele Convertor
Hi, How does one test the image quality(Sharpness) of a Tele Converter and its effect on a lenses performance. Take a picture of a target with the standard lens, then fron the same position take one with the tele convertor, crop and enlarge the standard image to match the tele one and compare. ...
Posted by gregmoll on 15/01/2010 - 02:22
Testing a Tele Convertor
More reach than a 1000mm lens.... :shock: Indeed and that on digital APS-C camera :shock: So the smaller the sensor, the larger the magnification? I'll try my Pentax 110 with an adapter behind a 650 mirror then. Regards
Posted by K10D on 15/01/2010 - 12:01
Ricoh XR Rikenon 50mm f2
Focusing a manual lens on a cropped sensor dSLR is a bit of a challenge especially when the eyes aren't as good as they once were, but when you get it right some of the older manual primes can be quite lovely. I really must buy that katzeye screen... K.
Posted by womble on 17/01/2010 - 13:10
Ricoh XR Rikenon 50mm f2
Is cleaning a lens infected with mould really that simple? Doesn't everything just spring up in the air once a screw-driver is applied? Never to be reassembled. The reason I ask is I've acquired a Chinon 135mm telephoto which is infected with the lurgi. It still works and the pictures SEEM fine, ...
Posted by bwlchmawr on 17/01/2010 - 20:19
New uses for old lenses
Any one else verging on an addiction to "old" manual focus lenses, both PK bayonet fit and M42+adapter? I've always loved using my K100 D Super with the kit lens, but slotting on a sub £10.00 bargain off e-bay and enjoying the almost forgotten delights of a nicely weighted focusing ring making t...
Posted by bwlchmawr on 17/01/2010 - 12:35
New uses for old lenses
I have: Pentax-A 28mm f2.8, 50mm f1.7 and 200mm f4 Pentax-M 50mm (several, both f2 and f1.7 as I keep buying mouldy ones and cleaning them), 135mm f3.5, 80-200mm f4.5 Pentax-K 55mm f1.8 Also a Takumar bayonet 28mm f2.8, although I don't use that much if at all. I try to stick to A series pri...
Posted by Dangermouse on 17/01/2010 - 14:25
Best portrait lens
Hi I have a K100D, with an old manual 50mm f1.7, a Sigma 70-300 f4.5 and the kit lens and was wondering, what was the best portrait lens to use? I am thinking the 50mm as its more equivalent to 85mm and that its also a lot faster for a nicer DOF, but I really like the look of a telephoto lens for...
Posted by K10D on 18/01/2010 - 19:19
Best portrait lens
The 50 mm only has the field of view of a lens 1.5 times longer focal length. However, the cropped sensor sees no more magnification with a 50mm lens tahn a FF sensor. Regards Sorry to go off topic here but is it not better to use angel of view instead of field of view? If you want you can ha...
Posted by Anvh on 18/01/2010 - 19:59
Best portrait lens
The 50 mm only has the field of view of a lens 1.5 times longer focal length. However, the cropped sensor sees no more magnification with a 50mm lens tahn a FF sensor. Regards Sorry to go off topic here but is it not better to use angel of view instead of field of view? If you want you can ha...
Posted by K10D on 18/01/2010 - 22:02
Best portrait lens
[quote:3496ace15f="K10D"]The 50 mm only has the field of view of a lens 1.5 times longer focal length. However, the cropped sensor sees no more magnification with a 50mm lens tahn a FF sensor. Regards Sorry to go off topic here but is it not better to use angel of view instead of field of view? ...
Posted by Anvh on 18/01/2010 - 22:58
Best portrait lens
[quote:3496ace15f="Anvh"][quote:3496ace15f="K10D"]The 50 mm only has the field of view of a lens 1.5 times longer focal length. However, the cropped sensor sees no more magnification with a 50mm lens tahn a FF sensor. Regards Sorry to go off topic here but is it not better to use angel of view i...
Posted by K10D on 19/01/2010 - 07:20
Optical Stabilisation
You have to choose between one stabilization method and the other - using both at the same time would wreck your images. Sigma now make one or two lenses in KAF mount with OS - you must disable SR to use them (or turn off OS). If you don't, then the SR mechanism moves the sensor enough to adjust...
Posted by Adqam on 19/01/2010 - 12:20
Sigma 17-70 speed
The Tamron 17-50 F2.8 saves you having to carry/use your primes so much, and it's almost macro, too. It focuses down to 27cm (distance from subject to sensor). I was also temped by the Sigma 17-70mm, but decided that the Tamron's f2.8 was more exciting than the Sigma's 70mm. For a more casual ...
Posted by iceblinker on 20/01/2010 - 23:13
Pentax FA* 600/4 ED [IF]
Some discussion about it here http://www.pentaxforums.com/forums/pentax-slr-lens-discussion/49428-medium-format-6-x-7-k20-sensor.html but I got bored after about 4 pages. :-) Dan
Posted by Daniel Bridge on 08/02/2010 - 14:20
telezoom choice
Well first of all, Canon seems to sharpen their photos a bit by software, Pentax default settings with JPG is quite soft so for get that detail for now. Pentax is now making althose classic focal lengths for APS-C sensor (1.5x crop) The DA*50-135 f/2.8 is the digital equivalent what the 70-200mm...
Posted by Anvh on 27/01/2010 - 23:06
300mm f4 vs 200mm2.8+TC
Sorry but isn't purple fringing a form of chromatic aberration? Also PF is depended on the sensor so results may vary by camera. I don't know how he meters his CA...
Posted by Anvh on 26/01/2010 - 11:55
300mm f4 vs 200mm2.8+TC
Sorry but isn't purple fringing a form of chromatic aberration? Also PF is depended on the sensor so results may vary by camera. I don't know how he meters his CA... hmmm, useful link, thanks, a debatable point it might seem - this is what I was thinking of as purple fringing http://www.dprevie...
Posted by bladerunneruk on 26/01/2010 - 20:09
