Yes Prieni we should also take into account the CoC if we want to do it correctly.

Going a bit further I know what the others are talking about with FoV but FoV is not the term to use in photogrphy.
It would be true with all other subjects but FoV as a different meaning in photography, the term to use is AoV (angle of view).

With AoV, it's about the angle that the camera capture so the sensor size and focal length are important there, so what basicly the same as the field of view for birds as an example.

FoV in photography is about what you see depending on your orientation and position, so there is a lot more around it.
So you can get "roughly" the same FoV with a 100mm on an APS-C sensor or on a MF (medium format).

I hope I'm not confusing anyone here



Now something else.
Isn't an APS-C better for low light then a 35mm sensor because it has a broader DOF?
For example indoor if you want to shoot an portrait and f/2.8 is perfect on APS-C sensor the means you need have... f/3.5 or f/4 with an 35mm sensor so that means you need to use an higher ISO right, of course a 35mm has less noise about a stop so all in all they preform equally as good right in some/most situations?

I was thinking about such system but instead of stickies using a wiki.
The current problem now is to edit a topic here on this forum will ask quite a lot on moderators who already have their hands busy keeping us in line.
Also a sticky would be maybe even more discouraging to ask questions then a wiki off site, since a sticky is always in plain view.

We can assume that new members don't know about the wiki so that they will ask an question, if it's a general question there is an article about then you can guide them to the wiki and say if there are any question afterwards that he/she shouldn't be afraid to ask them.
This way you accomplish three things.
- The OP is directed to a well writing article.
- The OP is encourage to ask questions about the article.
- It take less time for us.
Of course we hope there are question afterwards since you learn the most from them, because an explanation in a slightly different way might be the eureka moment where everything falls together.


Indeed Graham, great respect for those members who are so helpful and patience.

I also find it a pain to use the search engine, it's very hard to find something even if you know what you're looking for.

Maybe an option where you can set how far back it must look might be helpful.
Sometimes you get hits from 2004, they might be helpful of course but most of the time I at least don't want to look back more then a year or 6 to 3 months.

Also I've some troubles with some setting s of the search engine... I should contact the forum about that...

Reviews
DA*200
DA*300

You can't really go wrong with both, although focal length is different of course.

I think I know which topic you talked about in your first comment and there were more things going on.

The OP wanted a fast lens for sport I believe, that's why the 100-300 f/4 was suggest as a better option as the 120-400mm F4.5-5.6 because it was almost a stop slower and with a 1.4x TC he could extend the range to get a good wildlife lens which was as good or better as the 150-500mm F5-6.3.

All in all the 100-300mm will be more flex-able.

HSM is nice but screw-drive can also be fast, although the 100-300 is a pro lens so it could have a long focus throw...

Here is a review about the 100-300 and he tested it with the Sigma 1.4X TC, it's however on a nikon body but results would be comparable.
link
He doesn't have one of the other long sigma's but there is a test with an older model so you can roughly compare it with that.
link

Or if you've the money for a DA*300 then a DA*60-250 isn't so far away either, you're better of getting the lens you want a month later then buying one and deciding later you actually wanted the other one...

Have a look around and play with them in the shops to see how there are like to handle.
The difference between 250mm vs 300mm sounds big but actually isn't such a big jump, you can try it out with the Tamron of course.

Me neither Hefty.
It has his good and bad things like everything, some minor edits on the forum might do the trick like more stickies.
Who actually goes over what gets a sticky and what not and how do you get one?

So am I correct to say that the overall feeling is negative to get a wiki up?

Indeed John but not Pentax orientated
You can probably find everything on the net, I'm pretty sure 90% of the question asked here have been asked earlier so you can even find them on the forum. Then comes the question why are the question asked again?

PUF also has a FAQ but that is heavily outdated link

Thank you for your comment Bret.

One thing I hope a wiki will do is decrease the amount of question that are asked a lot of times.
I'm here 1,5 years now and I believe that almost 10 times someone has explained how to use manual lenses on a DSLR.
A sticky will do but the problem with that is it gets cluttered and we lost the ability to edit a comment after an hour so we can keep it up to date.
Here is an example link, a very good sticky with pages full of information but the information is everywhere

If a wiki would come I ain't sure if it should be 100% open for everyone to edit... if a review area would come then that would be open but for real articles maybe first set it on the forum and let people here discus it first and then put it on the wiki.
Hopefully some members here want to moderate the wiki a bit...

Yes like Steve says, we have it all in our own hands and we as members of this forum will pour information into it but like John says some things aren't black and white but guides and reviews should give people an idea to make there own judgement and/or help someone on the way.

Now the problem is if we write an review/guide about a product here on the forum it will get lost in all the other topics, threads and it gets cluttered with comments, a wiki will secure it for easy access without being cluttered.
Of course any debate about a subject or product can and should all be done here on this forum where you've the interaction you are missing on a wiki.

The underlining problem like Bret says is that we need to upkeep it properly or else it can get a maze of information that isn't useful.
To upkeep it that's up to us as well, like said I can (probably) make the basis for it but other members here should be prepared to put some time and effort in it as well.
If done properly it could be an addition to this forum.