Search results for 'back focus' - page 632
vivitar 80-200mm macro focusing zoom
Hi im new to photography and recently purchased a k1000 and this lense. I was wondering if anyone can comment on this lense and explain its features, and whats its best used for. As a macro lense its good for up close i believe but i find you have to be a few feet back or you can not focus with t...
Posted by Anonymous on 28/08/2004 - 01:25
vivitar 80-200mm macro focusing zoom
Something to be wary of - a lot of cheaper lenses claim to be 'macro' when they aren't really. All macro really means is that the lens can focus at very short distances, in other words you can get very close up. If you have to stand well back you probably don't have a 'genuine' macro lens, althoug...
Posted by mattie on 29/08/2004 - 16:12
vivitar 80-200mm macro focusing zoom
It is really quite misleading that manufacturers designate their lenses as 'macro' when they should really be called 'close focus' or something similar. In theory all lenses of the same focal length should have the same minimum focussing distance but there are a number of ways of constructing a len...
Posted by Kimbo on 30/08/2004 - 12:10
smc PENTAX-DA 16mm-45mm F4 ED
You can't label a lens that has the physical characteristic of a 16mm focal length with some property it does not possess. It would be a short tele lens if you managed to mount it on a domestic video camera but it would still be a 16mm. It's the frame size which governs the angle of view. Try dra...
Posted by malcolmk on 31/08/2004 - 09:32
Help: SMC PENTAX-A 50mm /1.2 lens Manual focus
Hi hope someone can help. Pentax have announced the discontinuation of the SMC PENTAX-A 50mm /1.2 lens Manual focus This lens is important to me as the company I work for build an instrument that uses this lens. Its important that I use a K mount manual focus type because the instrument...
Posted by Anonymous on 03/09/2004 - 12:41
Help: SMC PENTAX-A 50mm /1.2 lens Manual focus
There will probably still be plenty of stocks somewhere so you could always by in bulk to while you still can. They may have discontinued it but as a business using their product in what you manufacture you surely have some agreement so they may still make them privatly for you or if that is no...
Posted by Anonymous on 03/09/2004 - 13:21
Help: SMC PENTAX-A 50mm /1.2 lens Manual focus
Pentax USA still make/market a manual focus f2, but that's not much use if you can only go to f1.7. Also, are they just ceasing manufacture or are they stopping all supplies? They might be on the shelves for a while yet. I was under the impresion that the Autofocus lenses are almost the same as...
Posted by mattie on 03/09/2004 - 13:22
Pan Focus
Hello All, I found a sigma lens with "pan focus" written on the focusing ring. Does it mean something special ? Any explanation would be appreciated. thanks, mrz
Posted by mrz on 08/09/2004 - 11:01
Pan Focus
Hi mrz, I haven't come across the sigma "panfocus" lens. However, Pentax did make an 18mm one for the 110 SLR. The idea is that there is no focus movement in the lens. It is permantly at the hyperfocal length and relies on the depth of field to provide focus. A bit like the cheap plastic cameras th...
Posted by Kim C on 08/09/2004 - 18:48
Pan Focus
Hi Kim, Do you mean it is like using the fixed focus mark on certain SMC Takumar lenses ? Well I guess there's nothing special then. It is being offered on eBay: http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&rd=1&item=3837791504&ssPageName=STRK:MEWA:IT Vintage Camera is selling ...
Posted by mrz on 08/09/2004 - 20:45
M42 - Peleng
Hi I have a Peleng 8mm with a M42 adapter, now the lens is fully manual which is not much of a problem , how ever one thing I noticed is that the focus indicator does not work with this lens attached, and I am wondering If this has to do with the M42 adapter; could it be that the adapter is just...
Posted by Pano on 10/09/2004 - 10:12
M42 - Peleng
There is only one type of M42 adapter to use screw fit lenses on K fit bodies, so that is not the problem. I think the problem is that an 8mm lens has so much depth of field that it will be impossible to focus it with any accuracy on a ground glass viewfinder screen. Focusing aids will probably not ...
Posted by johnriley on 10/09/2004 - 18:55
M42 - Peleng
HI Yeah i was not asking how to meter it, just if the aperture set of the lens made any difference as it apparently does (from what i read on another post) also each time i read about it there are small facts which are forgotten The explanation of the focusing would not explain why it does no...
Posted by Pano on 17/09/2004 - 16:06
M42 - Peleng
HI Interesting theory of the DOF Now i just got ahold of an old pentax SuperA, and to my (not) surprice i could not get the Peleng to focus, THe Super A has one of those old focus systems with the circle and a middle line, and i can not get the lines straight in the middle.. What could i...
Posted by Pano on 28/09/2004 - 15:55
Tamron SP 350mm
Hello group, I have one of these mirror lenses and have taken some back garden shots with it, it appears to be a fine lens (for a non-Pentax that is), I will test it again when I can get out and about properly. The thing is though, I have been trying to find any information regarding this lens...
Posted by spbatt on 17/09/2004 - 14:06
Tamron SP 350mm
Kimbo, I will be mostly trying/using the Adaptall II (PKA) on my Pentax *istD - I find that changing the aperture on the camera body whilst in hyper program on the *istD is a real time saver. I guess that this should work ok!(?) As for the Pentax 1.7x AF adapter, I would definitely give that a tr...
Posted by spbatt on 21/09/2004 - 12:59
k mounts
Physically they will mount (the bayonet fitting is the same spec). If your lenses have the "A" (automatic) aperture, then yes you can use them on the *ist (and *ist-D, DS, and MZ-S)! These cameras with the so called "crippled mount" cannot read back the aperture of the lens when you manually sele...
Posted by MattMatic on 22/09/2004 - 12:48
pentax k1000 lesn cap
First check the filter thread size for your lens (Probably 49mm) and then order a lens cap. The body cap is to put on the camera body if no lens is fitted. A rear lens cap would be to protect the back of a lens that is not fitted to a body.
Posted by johnriley on 08/10/2004 - 19:00
pentax k1000 lesn cap
After losing a bunch of lens caps I bought some OpTech Snap Caps. There are two kinds. One screws on over the lens or filter. The other has a ring that goes behind a filter. They work great, providing the lens doesn't have a lens hood. My 50mm walk-around lens lost a few caps but now I pop the cap ...
Posted by Anonymous on 09/10/2004 - 14:41
Tamron 70-350mm zoom question
Hello Ron, The only 70-350 f4.5 that I know about is model 05A and I'm afraid it is not an SP lens. Don't let this put you off though, Tamron simply do not make a bad lens and if you're happy with the size/weight and price, then go for it - it'll work just fine with your cameras! A few specs:...
Posted by Kimbo on 08/10/2004 - 14:38
