Search results for 'back focus' - page 636
whats going on here?
It's a brave soul that even starts to reply to that.... When a lens is the right way round the distance to the subject is large, the distance to the film small. You get a normal sized image. Reverse the lens and you reverse that logic and end up with huge magnification. Try putting a wide angle l...
Posted by johnriley on 03/05/2005 - 22:40
pentax 100/f4.0 macro vs tamron 90/f2.5
I currently use a Tamron SP 90mm f2.5 for macro work, the manual focus AD2 model. It's a good lens, but I find it's a bit susceptible to lens flare. I was thinking about maybe getting a pentax 100mm f4 of similar vintage, and wondered if anyone here had experience of how they compared to each other?...
Posted by Anonymous on 14/05/2005 - 20:16
Where can I get a 800mm fixed telephoto lens?
I suspect that cropping would be a reasonable option. No light loss With 6MP to play with you can crop to 2272 x 1704 and still get an A4 print out of it. Less need to set your tripod in concrete, no change to contrast. flexibility in composition - plent of plus points. If you really n...
Posted by Terry1100 on 01/06/2005 - 08:48
Where can I get a 800mm fixed telephoto lens?
Why not just crop and then upsample to 3000 pixels? They'll never notice :wink: Seriously, though, I'd concur with the above comments about stability and haze. If the sun's out you'll find heat haze can be really limiting at high focal lengths. I'm in the same position myself. I've got a 400...
Posted by Anonymous on 05/06/2005 - 12:54
Macro vs normal
Most Tamron's are excellent performers, so I'm sure you won't be disappointed. It will work fine on your SFXn in auto mode and using it in manual will give you an idea as to handling on a KX - should you manage to get one. My understanding of macro lenses is that true macro lenses offer reproductio...
Posted by Kimbo on 10/06/2005 - 14:35
Macro vs normal
Yea i don't think it's any stronger than the 1.5 macro that's on my sigma 28 - 80. I could always get one of those add on rings for the sigma that X 2 the magnification. But as narrow the dof is in macro I'd tend toward a longer, dedicated macro. I see on the net there are 3 or 4 types of macro, rin...
Posted by fiannor on 10/06/2005 - 15:21
Oh boy! Pentax M 50mm F/1.4 !
I agree - I myself have the SMC 24 2.8. Though it is rare(ish) I happened to notice it in the window of the local LCE a few years back for a vaguely sensible price. Tend to use it on manual bodies (currently reduced to an MX) and have not really used many of the manual lenses on the digital body. J...
Posted by amilner on 20/06/2005 - 22:45
Pentax ME-SUPER K-MOUNT LENS?
It sounds a bit of a doubtful description, are you sure it is a Pentax lens or is it just a K mount lens suitable for a Pentax such as the ME Super? The description is vague.... The first f1.7 Pentax standard lenses were made for the M series cameras, such as the MX, ME, ME Super, etc., and they ...
Posted by johnriley on 16/06/2005 - 16:43
Pentax ME-SUPER K-MOUNT LENS?
He's not being very precise, but he no doubt just means a Pentax lens that is appropriate for the ME Super, and it is therefore almost certainly either an SMC Pentax or, more likely, an SMC Pentax-M lens. The cognoscenti call plain SMC Pentax lenses "K lenses". They were the first K-mount lenses...
Posted by George Lazarette on 16/06/2005 - 20:06
SMC Pentax F 35-135
Thanks Kimbo. I got the lens from eBay. It had sticking aperture blades when it arrived. I sent it to C.R. Kennedy (the Australian Pentax dealers) for repair. It has come back CLAed as well as very snappy aperture blades. They even tightened up the zoom ring so that it now does'nt self zoom whe...
Posted by glock40sw on 19/06/2005 - 06:47
lens type
Cristophe, You can use them all on the *ist-D and *ist-DS ;) (Pentax has one of the best designs in compatibility). The "M" series lenses are manual focus, manual aperture. Tricky to use on the *ist-D/DS, but perfectly possible. The "A" series are manual focus but can do auto aperture. Easy ...
Posted by MattMatic on 22/06/2005 - 10:23
lens type
Just to add to Mattmatic's fine summary, the current FAJ (and DA) lenses are of limited backward-compatibility. As they have no aperture ring, they wont work at all on some of the older manual-era SLRs (K1000 or earlier). Also, if you focus manually you'll find they have teeny-tiny focus rings, whic...
Posted by Anonymous on 22/06/2005 - 14:20
Aperture rings, yes or no?
The FA-J mount lenses and the DA lenses both do not have the aperture ring. To me, this is a fundamental aspect of camera ergonomics, especially the way I hold the camera ( with left hand cradling the lens and the camera, with easy access to the aperture) It seems that lots of people are getting r...
Posted by Acliff on 23/06/2005 - 01:24
Aperture rings, yes or no?
Acliff: I agree with you entirely about the ergonomics of the aperture ring. Apart from anything else, it splits up tasks between your hands. As Matt says, you're restricted to manual metering if you want to use an aperture ring on the istD(S). Depending on your point of view this is either a "fe...
Posted by Anonymous on 23/06/2005 - 12:23
Which Macro Lens for a *istD
For macro shooting, with its extremely narrow depth of field, you might probably want to control the focus yourself, as that is a major part of the composition.
Posted by Polaski on 12/07/2005 - 12:34
Which Macro Lens for a *istD
Hi Matt The 100mm macro lens arrived yesterday, been trying it out on a lot of different subjects around the house and garden, WOW! even WOWER with th AF-140C attached. Then my other new baby arrived today :D :D :D :D :D Sigma 70-200mm f2.8 APO EX DG (no MSM for the Pentax mount...
Posted by McBrian on 14/07/2005 - 22:27
Z1-P aperture readings through 2X Teleconverte
Is it a manual or AF converter? Hi Kimbo, it's the A-2XS converter - manual focus only. Does the Sigma works fine without the 2x on the Z1? (Sigma apparently refuse to pay the royalty for the body-to-lens communication protocols, and choose to reverse engineer it. Seems they don't alwa...
Posted by mattie on 29/06/2005 - 17:19
SLR lens maintenance advice please!
Hi, does anyone know what type of grease is suitable to use on an SLR lens? I have several lenses but due to use they have started making gritty rumbling noises as I'm using them (twisting the barrel for zoom/focus), it's just the bearings inside making the noise I expect, but I'd like to get a smoo...
Posted by leef on 29/06/2005 - 13:01
Pentax 80-320mm in strange condition
Hi all! I have just received my Pentax 80-320mm 4.5/5.6 that I bought of eBay, but it arrived in a very strange state. It has two visible problems: the first one is that the zoom ring is very loose from 80 to 100mm and then tightens up immediatly and immensely to a point I almost cannot twist ...
Posted by Flink on 30/06/2005 - 14:34
PAF /PKA
Manufacturers do sometimes vary their designations but generally, PAF stands for Pentax Auto-Focus and PKA for Pentax KA mount. KA lenses have electronic contacts that enable cameras with program functions to automatically recognise and select aperture settings - as in the case of your A3. PAF len...
Posted by Kimbo on 04/07/2005 - 13:31
