Re: Modified Pentax F 35-70 lens does over 1:1 macro magnification without rings (is it good ???)
On Jul 5, 2005, at 6:55 AM, Joaquim Carvalho wrote: A guy that does lens repairs showed me a Pentax 35-70mm macro lens modified to do 1.6:1 magnification without rings, more than any standard Pentax lens can do. I took it home to make some tests. I would be very interested to know what the modifications entail. I took a close-up picture of the MX speed selector: http://x64.com/joaquim/photo/photo05/ Second picture is a pixel by pixel center crop. Looks pretty good. I don't expect it to compete with a true macro lens in ultimate quality, but the only way to say for sure would be to test the modified zoom at the same magnification against a particular macro lens with an appropriate target. Is this lens good? Will a 50mm F4.0 or F2.8 be sharper? I have the A50/2.8 Macro as well as the F35-70/3.5-4.5 Macro, which achieves 1:4 magnification. There is no question that at 1:4 magnification, the A50/2.8 Macro prime lens has better rectilinear correction as well as higher resolution than the zoom. Godfrey
Re: Modified Pentax F 35-70 lens does over 1:1 macro magnification without rings (is it good ???)
A sramp for example. A live sramp of course... ...I meant a stamp! Andre
Re: Modified Pentax F 35-70 lens does over 1:1 macro magnification without rings (is it good ???)
Is this lens good? Will a 50mm F4.0 or F2.8 be sharper? You would need to compare it using a subject with very fine details, unlike the speed dial. A sramp for example. Andre
Modified Pentax F 35-70 lens does over 1:1 macro magnification without rings (is it good ???)
Sorry to post again but I'm very intrigued with this, I do not have experience with true macro lenses, I want your comments on this: A guy that does lens repairs showed me a Pentax 35-70mm macro lens modified to do 1.6:1 magnification without rings, more than any standard Pentax lens can do. I took it home to make some tests. I took a close-up picture of the MX speed selector: http://x64.com/joaquim/photo/photo05/ Second picture is a pixel by pixel center crop. An ant would have been more interesting but it's 4:00 in the morning and I couldn't find any. I'll post an ant picture as soon as I can find one. Is this lens good? Will a 50mm F4.0 or F2.8 be sharper?
