Search results for 'sensor cleaning' - page 178
PLEASE pentax: sell a pro-level digital SLR!
That`s right, but the DOF characteristics of such a lens on APS DSLR is different than 35mm 85/1.4. It`s a lot wider on APS DSLR - therefore making it a bit less valuable for portrait, IMHO. Yes, it's different, but it is shallower on an APS image sensor. A subject at 2m using a 50mm/f1.7 lens will...
Posted by MattMatic on 28/07/2005 - 15:58
PLEASE pentax: sell a pro-level digital SLR!
Yes, but it is shallower due to the fact, that the lens is no longer a 50mm (on 135 film) but 85mm (on DSLR APS format) ! Comparing 85/1.4 on 35mm film and 85/1.4 on DSLR APS format - the DOF is shallower on 35mm. Generally DOF on APS is wider, it`s a fact connected with the sensor size. The smal...
Posted by artykris on 28/07/2005 - 16:24
PLEASE pentax: sell a pro-level digital SLR!
I've not looked at the calculator, but that can't be right. However, it depends on how closely you look into the matter and does potentially become extremely complicated. For all practical purposes, there is more DOF on smaller formats, and if you think about it it has to be so. An 80mm lens has ...
Posted by johnriley on 28/07/2005 - 16:31
PLEASE pentax: sell a pro-level digital SLR!
Artykris, you enter the actual focal length (which is always 50mm for a 50mm lens, irrespective of whether it's on an APS sensor or full 35mm frame). So, you get 0.25m for 50mm/f1.4@3m on 35mm, and 0.2m for the *ist-D (using a circle of confusion value of 0.02mm). John - you are missing the "circ...
Posted by MattMatic on 28/07/2005 - 17:23
PLEASE pentax: sell a pro-level digital SLR!
Yes indeed John. I think, to get a little back on topic, that some clarification is in order for everyone: 1. If you use a 50mm lens on a 35mm back and the same 50mm lens on an *ist-D then the *ist-D will have less depth of field because the image sensor is smaller, and to produce an 8x10 (which ...
Posted by MattMatic on 29/07/2005 - 09:32
PLEASE pentax: sell a pro-level digital SLR!
Matt - I agree with you, thou I think we`re talking about the same stuff from two different angles ;). I still say that smaller sensor gives you more DOF. So APS gives you more DOF than 35mm - but (that`s the important point which made our views different ;) preserving the same perspective on th...
Posted by artykris on 29/07/2005 - 09:37
PLEASE pentax: sell a pro-level digital SLR!
In practical terms, the smaller formats will give you more DOF for the same field of view. That's why there will never be much use for an f/1.4 lens on a view camera, assuming one could be built. we have to stop down go f/45 or even f/64 to get a good sharp landscape, even with a normal 150mm le...
Posted by Arthur Dent on 29/07/2005 - 15:20
PLEASE pentax: sell a pro-level digital SLR!
Just to go back to the 35mm sensor comments: With the APS sensors currently in the Pentax DSLR's you always have the option of using the older manual, or "film" lenses despite the 1.5 magnification thing. But with Pentax investing in a line of DA lenses fitted to the APS sensor I fail to see how ...
Posted by Joshua Hakin on 29/08/2005 - 20:57
PLEASE pentax: sell a pro-level digital SLR!
I had seen it before on http://www.bdimitrov.de/kmp/bodies/prototypes/MZ-D.html but I always though Pentax used all that tech and knowledge to build the *ist D. Then again, the propect of having a 35mm-sensor on a digital version of the venerable MZ-S would appeal to (at least) some of us, no dou...
Posted by Flink on 30/08/2005 - 16:06
Optio SV 5 megapixels LCD screen / shutter
Frank, The LCD screens are all tricky to view in bright daylight, even on the pro SLRs. Personally, I cup my hand over the viewfind to look at it, but you can also purchase "bellows" and other screen shades that make it easier to see in daylight. Most of the delay in taking a photo is in focus...
Posted by MattMatic on 06/05/2005 - 11:24
*istD Disaster
Turn your back for a couple of minutes and you never know what disasters can happen. Today one of my youngest relatives got his hands on my *istD when I was looking the other way, I looked back in horror at the damage done. Somehow he managed to pop the focus screen and cover the mirror in littl...
Posted by McBrian on 15/05/2005 - 16:30
New Pentax *ist-DL
The *ist DL seems like a good ideia to me. Pentax needs to build itself a new, fresh userbase. This seems like a great camera to do just that. If it is priced correctly (I mean, cheap enough, what with the cheaper viewfinder, smaller buffer, smaller AF sensor array), it may have good sales. I ...
Posted by Flink on 06/06/2005 - 10:23
Digital pros and Cons
Pentax have given me the option of replaccing my non functioing MZs body with a new DS instead of perservering with attempts to fix it. I am seriously considering this, I will retian my MX and Ricoh GR1v 35mm cameras and my film scanner. Please can you help me with some questions. I am ve...
Posted by Kevin Stephens on 06/06/2005 - 17:15
Digital Infra-Red
1) It depends on the amount of IR light and how sensitive the CCD is to it. With my Fuji S7000 the exposures run into many seconds and are not that good. With my Pentax *istDS hand holding is possible if the ISO is upped to 1600 or 3200. The results with the *istDS are excellent. 2) You can use a...
Posted by johnriley on 19/12/2005 - 22:38
APS-C
Ted, This refers to the size of the digital sensor - it's the same size as APS film rather than a 35mm frame. This explains the focal length mulitplier (1.5x) when used with lenses designed for 35mm. The lenses don't obviously get any longer but for experienced 35mm photographers it provide...
Posted by Terry1100 on 21/06/2005 - 07:26
APS-C
Ted, Please realize that all consumer Digital SLRs have an APS-C sized sensor. That includes the Canon Rebels (300D and 350D), the Nikon D50, D70 and D70s (in fact, the Nikons apparently use the same sensor as the Pentax *ist-D, DS and DL). If you want a full-frame (35mm) camera (like a Nikon ...
Posted by Flink on 21/06/2005 - 11:11
APS-C
Gentlemen: Thank you for the clarity of your explanations. I now get the picture, so to speak. Nice to know that the Pentax has the same sensor as the D series Nikons, which, I assume, cost more money. Ted
Posted by tedwhite on 21/06/2005 - 17:13
APS-C
I wish you people would stop calling it a "focal length" multiplier. The focal length of the lens is not changed, just the field of view. Call it a crop factor, if you must. That is a more accurate description of what is happening. After all, in Medium Format you have to take into account what...
Posted by Anonymous on 06/07/2005 - 03:29
No more *ist-D??
Hmm a number of useful features lost there. I liked the AF button, backlit LCD and Av/Tv overide on my MZs; which Pentax are unable to repair hence they are helping me with a DS replacement. I predict Pentax will have a new semi pro model out later with 8mp (or larger) sensor,wiht a return of ma...
Posted by Kevin Stephens on 24/06/2005 - 16:29
No more *ist-D??
The *st D is still available, you might have to special order it. At that's what I did in Canada. If they make a D2 with the full KAF mount (with the mechanical apeture sensor in the lens mount) I might even cough up for a secone DSLR!
Posted by Anonymous on 05/07/2005 - 15:25
