> On Jun 8, 2025, at 11:46 PM, Henk Terhell <[email protected]> wrote: > > I have no experience with the Bigma, but I think you loose some stops with > extension tubes.
Yeah, you do, probably related to the delta in equivalent crop area. I would guess that at an extra mag factor of 1.4 linear, you would lose a stop. > For me, indeed the HD 55-300 PLM is most convenient for fast moving insects. > It has fairly fast focussing, is light weight and has a minimum focus > distance at 300 mm (450 eq.) of 95 cm. Therefore most of the times I leave > my Tamron 90/2.8 macro at home. > Here two shots (somewhat cropped) of bumblebees taken with the 55-300 PLM > yesterday. > https://flic.kr/p/2r9AvQ2 > https://flic.kr/p/2r9BtUV Those are great shots. I suppose I could calculate magnification by photographing a ruler at minimum distance and dividing by the width of the sensor. > > Henk > > Op 2025-06-09 om 06:43 schreef Alan Cole: >> Henk Terhell uses his K70 & HD 55-300 PLM very successfully for insect >> shots. The big advantake is that the photographer is distant from easily >> disturbed subjects. A difficulty with a Bigma is that it is a bit soft at >> 500mm. I have tried it with my screw-drive HD 55-300 & K5 but the focusing >> is rather slow by comparison. >> >> Alan C >> >> On 09/06/2025 00:03, Larry Colen wrote: >>> >>> On another photo list, someone was asking about borrowing a macro lens for >>> a trip to Costa Rica, someone suggested putting extension tubes on their >>> telephoto. As usual my mind went to a silly, probably impractical place. >>> >>> What if I were to put extension tubes on my Sigma 50-500? Have any of you >>> tried doing something like this? Putting extension tubes on a fairly long >>> telephoto, to make a ridiculously long macro? >>> >>> For them that like photos, on a related subject, here are 3 photos I >>> processed last night of a cropped fence lizard that I took with my bigma a >>> couple of weeks back: >>> https://www.flickr.com/photos/ellarsee/albums/72177720326695531 >>> >>> It's probably a blue belly, I didn't get close enough to check. >>> >> > -- > %(real_name)s Pentax-Discuss Mail List > To unsubscribe send an email to [email protected] > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > __ Larry Colen from Lothlorien [email protected] -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to [email protected] to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
