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Forum: Pentax SLR Lens Discussion 12-28-2009, 06:20 AM  
Couple of new toys.
Posted By readone
Replies: 4
Views: 1,941
Exact Name : smc PENTAX-M 1:2 50mm
Color : black
Years of Production : 1979 ~ 1985
Availability : used, several times a month
Optical Formula : 5 elements in 5 groups
Aperture Range : f/2 ~ f/22
Number of Aperture Blades : 6
Minimum Focusing Distance : 0.45 m
Maximum Magnification : 0.15 X
Filter Diameter : 49 mm
Maximum Diameter :63 mm
Length : 31 mm
Weight : 160 g

This lens is not very exciting. It was the standard lens that Pentax sold with all their M-series bodies, so it is very abundant. The lens was optimized for low-cost production and is optically not quite as good as the slightly more expensive M50/1.7 or A 50/1.7. Still, if you've never used a prime lens, you will be amazed at the quality of images you get with one of these "cheap lenses".

However, there is one interesting thing about the M 50/2. In early 2007 Fabio Cittadini noticed that some M 50/2 lenses featured a linear aperture lever just like the newer SMC-A lenses. Fabio Cittadini and Dario Bonazza were able to track down several M 50/2 and compiled the following list of differences:
Forum: Pentax Camera and Field Accessories 12-28-2009, 06:11 AM  
GGS protector for Pentax K7
Posted By readone
Replies: 1
Views: 4,362
I have the GGS protector on the M8 and the ACMAXX LCD Armor protector on a Digilux 2, Pentax K7, Canon G7 etc.

If I were to do it all over again, I would go with the ACMAXX for the M8 as well. The GGS has a peculiar bad habit - face grease stays on it, is very difficult to wipe off and it becomes relatively difficult to view the LCD. For some strange reason, the plastic ACMAXX does not have this problem. Even with face grease, I can see the LCD without much difficulty.
Forum: Pentax DSLR Discussion 12-28-2009, 05:58 AM  
K20D AF Adjustment
Posted By readone
Replies: 4
Views: 1,656
I have been playing with my K20D uisng a Sigma 17-70 Macro lens.

Printed off the AF Test Chart and tried it out and it seems the lens BF a little, well actually quite a lot. :O

I adjusted the AF to +7, which seems quite high! Has anyone else adjusted for lens BF and if so, how much adjustment was made?
Forum: Flashes, Lighting, and Studio 12-15-2009, 06:54 AM  
Old Flash on New Camera
Posted By readone
Replies: 6
Views: 1,974
This instructable shows you how to make a really easy and simple circuit, that protects your new camera from high trigger voltages in old flashes. It is completely safe and will not damage the cameras circuits!

It is better than those slave adapters that "look" for a flash, and then quickly activate the flash, since those adapters can be set off by other cameras. If you're at a party, that can be quite annoying.
1.what you need:
- general soldering equiptment - a sense of electronics - an Optocoupler with triac output (i.e. MOC3062) - 2 capacitors ( 10 �µF ) - 3 resistors ( 500, 1M, 30...80 ohms)
2.The circuit:
The circuit is pretty simple and streight forward. -The Optocoupler in the middle isolates the camera from the flash. If you don't know what an optcoupler is or what it do
3.the case:
I got my self an adapter, that would give cameras that only have a hotshoe an PC cord connector
4.the result:
ofter squeezing everything inside, I got a battery clip from an old motherboard and glued it to the side of the adapter. And that is it. you can now connect pretty much an to use:
now you just put the adapter on the camera and either mount the flash on the adapters hotshoe or use the PC cord. I like the PC cord alot, because it gives you alot of new
Forum: Pentax SLR Lens Discussion 12-15-2009, 06:35 AM  
FA 50mm/1.4: Preposterous Price?
Posted By readone
Replies: 182
Views: 18,506
Quality of my pictures, and they sell well! Price Weight Small filters Dropped in on hard surfice, and it still works...
Unfortunately, Pentax does not currently offer a cheap 50mm 1.8 around $150. But you can get older lenses... yes, i agree.
Forum: Photographic Technique 12-08-2009, 08:20 AM  
Rear curtain sync with K200D & Metz 48 AF-1
Posted By readone
Replies: 15
Views: 6,795
Rear-curtain sync (also called second- or trailing-curtain sync) is the ability to time the flash pulse to just before the shutter closes rather than when it opens. This is usually used in combination with a longer exposure to gather ambient light while using the flash to freeze a main subject. With first-curtain slow sync, any motion trails captured by the ambient exposure appear to lead backwards from frozen subject. Rear-curtain makes it look right, but the downside is that it's much harder to get the timing right.

Again, the Pentax AF360FGZ and AF540FGZ can do this, as can all Metz models and the Sigma Super variant. Additionally, the Promaster 7500EDF and Sakar flashes can too.

info : camera tips and guide's
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