All Forum Comments
Comment by prsjnb posted on Flash gun advice at 05/10/2010 - 13:04
That Sigma is not the sharpest lens, especially in the second half of its range. Sigma also have significant variance between units. Another copy might well be better.
To get the best out of it you do need to stop down to f8/11 and use a sensible shutter speed if hand-holding (1/500 or greater) or a tripod.
In my experience using SRS with this lens at shuter speeds greater than 1/125 often resulted in poor IQ: don't ask me why - it just did
It does have a tendency to 'hunt' when using AF in low light.
Despite having purchased a Sigma 100-300mm f4 this Summer (which is superior in every respect, as you would hope for the price!), I'm reluctant to part with mine: partly for sentimental reasons but mainly because of its close focus ability (1:2). When used in this mode the IQ, whilst obviously not up to the standard of a bone-fide macro, is more than acceptable, IMHO, and has allowed me to capture butterflies and the like from a 'safe distance'; e.g.
link and link.
To summarise, I suggest that you give your copy a temporary reprieve and try some of the excellent tips given by others before ditching it and/or splashing out on more expensive glass.
Jon
Comment by prsjnb posted on Sigma 70-300 apo lens , Advice needed. at 03/10/2010 - 19:03
Just for fun
what is the best music video you have ever seen
The Who – Won’t Get Fooled Again (taken from ‘The Kids Are Alright.’) link
Leftfield featuring Afrika Bambaata - Afrika Shox link
Massive Attack featuring Elizabeth Fraser - Teardrop link
Jon
Apart from the sucker-on-LCD-screen problem it seems to be better in several ways.
One of the best photographic accessories I've purchased: has saved many hours, pounds and much frustration
Regards,
Jon
Comment by prsjnb posted on Spyder3Express at 02/10/2010 - 15:26
Just wanted to add that Macro lenses compared to normal lenses offer a very flat field of focus, so the focus through it frame is the same. With many normal lenses you see that the focus bends slightly at the corners. This of hardly any concern with normal shooting but with macro you can very easily see the field of focus so it's important it's perfect.
"Close but no cigar", as Mr T Dolby would say
Thanks for noticing the important omission
Best wishes,
Jon
Comment by prsjnb posted on Please explain macro lenses too me ! at 01/10/2010 - 22:18
Henceforth, my posts, especially in response to requests for C&C, are going to be considerably more circumspect and respectful
Any forum member know where I can get kevlar body armour for a good price
Jon
Comment by prsjnb posted on Which eye? at 01/10/2010 - 16:42
SRS have them for about £30.00 inc p&p for forum members link. 1.2x might not sound like much but I found it made a huge difference.
Have you set the dioptre adjustment correctly for your eye?
Jon
Comment by prsjnb posted on eyepiece magnifier at 01/10/2010 - 11:28
Jon
Comment by prsjnb posted on Transparent wings at 01/10/2010 - 10:47
There are two factors you need to consider: magnification ratio and working distance.
A 'true' macro lens is one capable of capturing the subject on sensor or film at 1:1, that is to say 'life size', or greater. Some 50mm macro lenses capture at 1:2 (half-life size)unless coupled with an extension tube of 25mm, which may be a 'matched accessory' produced by the lens manufacturer.
The other consideration is working distance. 50mm macro lenses have a short working distance which is ideal for still life work and plants and flowers in the wild. It is not a good choice, however, if your main interests include photographing insects and other forms of wildlife that are easily 'spooked'.
100mm macro lenses are of intermediate working distance and are well-suited to those whose interests encompass still life and wildlife. For this reason, they are the most widely available. Not all lenses in this range have a focal length of exactly 100mm, the range extending from 90mm (Tamron) to 105mm (Sigma).
150mm macro lenses and above (200mm is the longest I am aware of)have a long working distance and are considered ideal for those whose main interests include insects and small animals.
Any macro lens from a reputable manufacturer will have been designed to give its best performance at or around its minimum focus distance, but, in most cases, produce sharp images with good definition and contrast throughout the range. They also tend to work well at their minimum aperture (typically between F2.8 and F4), allowing for the creative use of depth of field when photographing larger subjects. For this reason, many photographers also use their macro lens for portrait work.
From the above, you will appreciate that it is best to have thought carefully about your specific needs before making any purchase. If you are just starting out and not yet sure in which direction your interest in macro photography will develop, it would make sense, IMHO, to go for a 1:1 lens of intermediate working distance (90 - 100mm). Weight, handling and weather resistance are also important considerations, especially if you envisage most of your work being 'in the field'.
Macro lenses in current production to fit Pentax DSLRs are available from Pentax, Sigma and Tamron, all of which come highly recommended I have owned lenses from Tamron and Sigma and been delighted with the quality and IQ of both). The range is a little wider if you are considering a second-user lens (Tokina,Vivitar, Cosina and Panagor,among others). A good place to start narrowing down your choice would be the review section on the 'other place' link.
Focus is critical in macro photography, as is DOF link and AF is not always the best choice. AE, whilst helpful, is not always essential, especially when using flash, as for a given magnification, and hence working distance, the user quickly learns which aperture to set and to recognise when exposure compensation may be necessary. For these reasons, I suggest that you do not dismiss the idea of purchasing a second-user manual lens 'out of hand', as the quality of the optics and bokeh of some of these older lenses is quite remarkable if they have been well cared for.
Finally, there are many other ways of achieving magnifications of 1:2 - 1:1 or greater that do not require the initial expense of a true macro lens (extension tubes, reversing rings and Raynox DCR Macro converters are all used with considerable success by many users on this forum: just check out the gallery).
I hope the above proves helpful and does not leave you feeling even more confused.
I look forward to welcoming you to the fascinating, and hugely addictive, world of macro photography, as I'm sure others on the forum do too
1:1 best wishes,
Jon
Comment by prsjnb posted on Please explain macro lenses too me ! at 01/10/2010 - 10:40
Looks like you found a real bargain:mrgreen
Best wishes,
Jon
Comment by prsjnb posted on Pictures using my Tokina RMC 300mm F5.5, M42 at 28/09/2010 - 21:37


I think the Metz 48 offer more features (swivel head is a important one) than the AF360FGZ for the price but from what I heard the UI is better on the Pentax.
Even though Curry's are selling off the PENTAX AF360FGZ cheap, I would still get the Metz which can be had for a similar price or possibly less for two main reasons:
i) it has better features
ii) spares are easily obtained and, in my experience (I had to replace a damaged battery cover recently), not prohibitively expensive; which I doubt very much is true of spares for the Pentax.
Jon