Search results for 'sensor cleaning' - page 93
What am I missing DA18-55?
To be exact, magnification ratios are quoted as 3:1 or 2:1 etc. where the magnification is greater than life size. Where the magnification is less than life size it would be 1:2 (half life size), 1:3 or 1:4 and so on. Hope that helps. Sorry, always get it the wrong way round. To me it makes se...
Posted by Tyr on 27/09/2007 - 10:42
Wide Angle Lens Compatibility Issue
Ziggles, The sensor on the digital SLR cameras is smaller than 35mm film. Consequently, the digital will give a centre crop. For example, a 100mm lens on digital will behave like a 150mm did on film. That's why for digital Pentax have developed lenses like the SMC-DA 12-24 ;) Matt
Posted by MattMatic on 24/09/2007 - 11:43
Wide Angle Lens Compatibility Issue
Can anyone help me? My uncle has a old Pentax Wide Angle lens which fits on to my new K10D with no problems but it does seem to give a wide angle view. Its actually narrower than my standard 18-55mm lens. Can anyone explain to me if theirs something I need to adjust or is it just the lens is not ...
Posted by George Lazarette on 24/09/2007 - 11:45
Cosina 20mm lens ?
I think the Cosina 20mm F3.8 is actually the same lens as Vivitar sell as a 19mm F3.8. If so then I used to own one of the Vivitar versions and here's what I had to say about it in a review written at the time: Build Small, light and compact, with a 62mm filter ring, This lense does not inspire ...
Posted by niblue on 25/09/2007 - 13:17
Help me spend some money: DA40/540FGZ Vs. FA43/360FGZ
Sometime during October I'm intending to take my next step along my personal Pentax roadmap. Up until now I've been able to do some research and come to my own conclusions, but now I'm sat on the horns of a dilemma and it's not very comfortable... Help! The story so far; I took delivery of my bel...
Posted by hefty1 on 27/09/2007 - 20:47
Help me spend some money: DA40/540FGZ Vs. FA43/360FGZ
From what I understand the DA40 will also work on a full-frame sensor . . . Sorry to disappoint. All SMC Pentax-DA and DA* lenses have an image circle to suit the APS-C sized sensors. These lenses will work to some degree on 35mm film bodies in that you will capture an image. Expect to see severe vi...
Posted by Mannesty on 28/09/2007 - 16:45
Help me spend some money: DA40/540FGZ Vs. FA43/360FGZ
Tyr: I've re-read the specs on the Metz website but it clearly states the wireless function is only available on the Nikon and Canon variants, although it doesn't specifically say the P-TTL version can't use wireless and maybe the information on there is out of date? It would be interesting to he...
Posted by hefty1 on 28/09/2007 - 18:44
Help me spend some money: DA40/540FGZ Vs. FA43/360FGZ
Whilst I knew the recently designed DA + DA* lenses have reduced image circles, I was under the impression that the DA40 was just a reincarnation of the earlier M40 but minus the aperture ring . . . . . . what is it that makes the 540 so much better than the 360? Re: The SMC Pentax-DA 40mm Limit...
Posted by Mannesty on 28/09/2007 - 21:51
Help me spend some money: DA40/540FGZ Vs. FA43/360FGZ
Re: The SMC Pentax-DA 40mm Limited Lens Your impression is incorrect and my statement holds true. ALL DA and DA* lenses (including the 40mm Ltd) are designed excusively for the APS-C sized sensor used by Pentax current range of DSLR's. The following are quotes from Pentax DA 40mm Limited features ...
Posted by amilner on 30/09/2007 - 15:41
Tamron 75-250 F/3.8-4.5 CF Tele-Macro-Zoom
If it was a decent performer on film it most likely also will be on digitial, especially as the APS-C sensor size will result in the corners/edges of the image circle not being used - usually the weakest point. CA might not be well controlled however that can often be fixed in post-processing.
Posted by niblue on 29/09/2007 - 09:03
Help with lense choice for new guy.
The Sigma is a 300mm lens whether it's used on a DSLR or a film SLR, however due to the cropping effect of the smaller APS-C DSLR sensor size it's effectively the same as a 450mm lens would have been with 35mm film. The same is true of your 55-200 - at the 200mm end on a DSLR it's equivalent to what...
Posted by niblue on 02/10/2007 - 15:51
New DA lenses on their way
I first got the convertor when I first tried AF. At the time I didn't use it all that much. I was and I still am used to MF so I tended to just use a longer MF lens. However, with the difference in sensor size and the extra workflow in using non A lenses on the dSLRs, I find I use it a lot more now....
Posted by Kim C on 05/10/2007 - 12:05
Pentax A 35-70 zoom - dud?
On a very proportion of the Pentax lenses (and indeed many other makes), removing the front bezel is the first step in removing the front elements for cleaning. It is usually easier to go in this way as it doesn't upset the auto diapraghm which can be a PITA to get back together or the focussing. ...
Posted by Kim C on 26/10/2007 - 09:19
What lenses should Pentax make?
The 300 F4 is on the roadmap. :wink: I didn't say all the list was exotic but some of them are somewhat more unusual. I don't think the 85/1.4 is that likely. For a start it is too close to the 77/1.8. I also don't think we will see the very long lenses. I am not sure how many 1000/8 they sold fo...
Posted by Kim C on 20/11/2007 - 18:26
Wide angle options ?
When I use the P filter holder on my Sigma, I don't use an adaptor ring, the holder sits quite nicely in the bayonet mount for the lens hood instead. So the holder sits a bit further back than it would on an adaptor ring, which may well help matters. I'll have to try cutting off the front sections...
Posted by Daniel Bridge on 19/11/2007 - 14:33
Wide angle options ?
Well, i can't afford another lens so I have devised a cunning plan... I can 'convert' my 18-55 to a 10-47 by just sawing off 8mm! where should I saw, front or back? Don't saw it off the lens, silly - machine the mount down by 8mm. That'll bring the whole lens closer to the sensor, and you'll ...
Posted by ChrisA on 24/11/2007 - 19:25
Wide angle options ?
Well, i can't afford another lens so I have devised a cunning plan... I can 'convert' my 18-55 to a 10-47 by just sawing off 8mm! where should I saw, front or back? Don't saw it off the lens, silly - machine the mount down by 8mm. That'll bring the whole lens closer to the sensor, and you'll ...
Posted by justgetoutandride on 24/11/2007 - 19:46
LBA Tamron 90mm Macro SP Di
Does your sensor need cleaning? :-)
Posted by Ammonyte on 24/11/2007 - 23:09
LBA Tamron 90mm Macro SP Di
Does your sensor need cleaning? :-) Badly by the look of it!
Posted by xbow on 26/11/2007 - 21:42
LBA Tamron 90mm Macro SP Di
Does your sensor need cleaning? :-) Odd, the first two pics have the same piece of fibre in the same place ? ? ?
Posted by Mannesty on 27/11/2007 - 17:58
